As rice breeding continues to advance, hybrid rice varieties have emerged as a powerful tool for increasing yields, improving disease resistance, and enhancing grain quality. A key innovation behind hybrid rice production is the Cytoplasmic Male Sterility (CMS) system, which enables breeders to produce hybrid seeds efficiently. This blog post explains how the three-line CMS system works and why it’s so valuable for breeders and farmers alike.
What is Cytoplasmic Male Sterility (CMS)?
Cytoplasmic Male Sterility (CMS) is a genetic trait that prevents a plant from producing functional pollen. This characteristic is particularly useful in hybrid seed production because it ensures the plant cannot self-pollinate. Instead, the male-sterile plant must be pollinated by another plant, allowing breeders to control the parentage of hybrid seeds.
The Three-Line System in Hybrid Rice Production
The three-line system involves three types of rice lines:
A-Line (CMS Female): A male-sterile line that cannot produce viable pollen, used as the female parent in hybrid seed production.
B-Line (Maintainer Line): Genetically identical to the A-line but fertile. It is used to maintain the CMS trait in the A-line.
R-Line (Restorer Line): A fertile line that carries restorer genes to restore pollen fertility in the F1 hybrid generation.
Each of these lines plays a critical role in ensuring the successful production of hybrid rice seeds, and together they contribute to the final hybrid variety’s vigor and performance.
How the Crosses Work in the Three-Line System
1. Maintaining the CMS Line
The A-line (CMS female) is male-sterile, meaning it cannot produce seeds on its own because it lacks viable pollen. To maintain this line, breeders must cross the A-line with the B-line (maintainer), which has the same genetics but does not have the male-sterile trait.
Result: More A-line seeds, all of which remain male-sterile. The B-line helps propagate the A-line without restoring fertility, ensuring that male sterility is preserved.
2. Producing Hybrid Seeds
Once enough CMS A-line plants are produced, they are crossed with the R-line (restorer) to create hybrid seeds. The R-line carries genes that restore pollen fertility in the hybrid offspring, allowing the hybrid plants to reproduce normally.
Result: F1 hybrid seeds that combine the best traits from both the A-line and the R-line. These seeds exhibit hybrid vigor (heterosis), meaning the plants will grow faster, yield more, and be more resilient to stresses like pests and diseases.
Visual Representation of the Three-Line System
Below is a flowchart that visually represents the three-line CMS system:
This flowchart provides a simplified view of how the A-line, B-line, and R-line interact to produce hybrid seeds. It helps to visualize the sequential process of maintaining the CMS line and producing vigorous hybrid seeds.
Distribution of Beneficial Traits in the Three Lines
In the three-line system, both the A-line and R-line contribute valuable traits to the hybrid, while the B-line helps maintain the CMS line. Here’s a breakdown of what each line brings to the table:
Genetically identical to A-line; used for maintenance
R-Line (Restorer)
Male parent; restores fertility
Provides restorer genes and complementary traits to enhance hybrid vigor
Why Use the Three-Line System?
The three-line CMS system has been a game-changer in hybrid rice breeding for several reasons:
Efficient Hybrid Seed Production: CMS ensures the A-line plants cannot self-pollinate, making it easier for breeders to control the crossing and ensure that hybrid seeds are produced with the desired genetic combinations.
Hybrid Vigor: The cross between the A-line and R-line produces F1 hybrid plants that often outperform both parent lines due to heterosis (hybrid vigor). These plants grow faster, produce higher yields, and are more adaptable to varying environmental conditions.
Consistent Performance: By carefully selecting A-line and R-line parents, breeders can develop hybrids that consistently deliver high yields and other desirable traits, such as disease resistance or drought tolerance.
Real-World Example in Rice
For example, let’s say a breeder selects an A-line that has high grain quality and yield potential but lacks disease resistance. They could pair this A-line with an R-line that has strong disease resistance and good stress tolerance. The resulting hybrid will combine these traits, offering farmers a variety that not only yields well but also stands up to diseases and environmental stressors.
Saving Hybrid Rice Seeds and Trait Loss
It’s important to note that saving seeds from hybrid rice plants is generally not recommended. The F1 hybrid seeds produced through the three-line system exhibit hybrid vigor due to the combination of traits from the A-line and R-line. However, if these hybrid seeds are saved and replanted, the resulting plants (F2 generation) will not retain the same level of performance. This is because the desirable traits that make the F1 hybrids so productive can segregate and diminish in subsequent generations, leading to reduced yields, inconsistency, and loss of hybrid vigor. To read more about organic rice varieties and resources click this link: Organic Rice Resources
Key Takeaways
A-line (CMS) contributes key agronomic traits but cannot produce pollen, ensuring controlled cross-pollination.
B-line is a maintainer, used to propagate the A-line but not involved in the hybrid seed production.
R-line restores fertility and adds complementary traits, leading to a vigorous and productive F1 hybrid generation.
The three-line CMS system enables efficient hybrid seed production, combining the best traits from different lines to create high-performing hybrids that meet farmers’ needs for yield, resilience, and grain quality. The three-line CMS system remains one of the most effective methods for producing hybrid rice seeds, ensuring that breeders can develop varieties that push the limits of productivity and sustainability.
Conclusion
As global demand for rice, especially organic rice, continues to grow, the ability to produce high-yielding, resilient hybrid varieties through the CMS system is more important than ever. This method ensures that breeders can consistently produce hybrids that help farmers achieve better harvests, even in the face of environmental and biological challenges. Hybrid rice breeding holds a promise for amplifying traits important for organic producers.
By understanding the nuances of the A-line, B-line, and R-line, breeders can make informed choices about which traits to focus on in their breeding programs. Ultimately, the three-line system not only enhances hybrid seed production but also contributes to the long-term sustainability of rice farming.
When it comes to hay production, many farmers assume that bales harvested from the same field will contain similar nutrient levels. The differences across fields was evident in a recent article by Michael Reuter in Progressive Forage1. His article and data show us all, the significant differences even among bales from the same field. Understanding and managing these differences can make a big impact, especially for organic farmers who want to optimize livestock nutrition and maintain a consistent quality of forage.
Variability in Nutrient Composition: What the Data Tells Us
The following table from the article1 presents the nutrient composition and analysis of 20 individual bales randomly sampled from an 86-acre hay field, which was managed as a unit and harvested all at the same time:
The analysis of the 20 hay bales showed surprising variability in key nutrients such as Crude Protein (%CP), fiber content (measured as %ADF and %NDF), and essential minerals like Calcium (%CA) and Phosphorus (%P). Summary statistics of the nutrient composition are presented below:
Crude protein, for example, varied from 9.7% to 15.9%. This 6.2 percentage point difference could significantly influence the nutritional value of hay fed to livestock.
Fiber levels also differed substantially. The ranges in Acid Detergent Fiber (%ADF) and Neutral Detergent Fiber (%NDF) directly affect how digestible the hay is and how much livestock will eat. Calcium and phosphorus levels, which are critical for bone health and metabolic functions, also showed noteworthy differences between bales.
Why Does This Variability Happen?
Even in a well-managed hayfield, several factors can contribute to this nutrient variability:
Soil Fertility Differences: Organic amendments like compost or manure may not be evenly spread across the field. Variability in soil nutrients can cause different areas of the field to produce hay with varying nutrient levels.
Crop Rotation and Plant Diversity: Rotating different crops or allowing natural diversity in the field is beneficial for soil health, but it can also lead to differences in how well each crop absorbs nutrients.
Pest, Weed, and Microclimate Effects: Organic fields often have more variability in pest pressure, weed growth, and microclimates. These differences can lead to uneven growth, which in turn affects nutrient content.
Managing Nutrient Variability
To minimize these differences and provide more consistent forage quality, farmers can take several practical steps:
Soil Testing: Regularly test soil across different sections of the field. This helps identify nutrient deficiencies or hotspots, allowing targeted amendment application.
Even Amendment Application: When applying compost, manure, or other organic fertilizers, try to ensure even distribution across the field. Variability in amendment application is a key factor in nutrient inconsistency.
Use Cover Crops: Cover cropping can help improve soil structure and increase nutrient cycling, which leads to more uniform plant growth.
Monitor Harvest Stages: Harvesting at a consistent plant maturity stage across the field can help reduce variability. Plants harvested at different growth stages can differ significantly in nutrient content.
MatchingRegular Soil and Forage Testing: Applying soil nutrients based on soil tests and then testing multiple hay bales gives a clearer picture of the overall nutrient profile from start to finish. Testing hay allows adjustments in livestock feeding to meet nutritional needs effectively and maybe even save money!
Why Managing Nutrient Variability Matters
In organic systems, where synthetic supplements are not allowed, maximizing the natural nutrient content of forages is essential. Variable hay quality can significantly impact livestock health, as inconsistencies in nutrition may lead to reduced growth rates, lower milk production, or other health issues. Moreover, optimizing the quality of on-farm forage can reduce the need for expensive purchased supplements and any organic supplements are not cheap.
Maintaining consistent forage quality also supports animal welfare, which is a core value of organic and sustainable farming. Healthy, well-fed animals are more resistant to disease, aligning with the organic principle of promoting natural immunity and reducing intervention.
Conclusion
Variability is a natural part of farming, but with informed management, we can turn that variability into an opportunity for learning and improvement—ultimately providing better feed for our livestock and keeping our farms resilient.
1.Data Source: October 1, 2024 issue of Progressive Forage written by Michael Reuter, Analytical Services Technical Manager at Dairy One Cooperative Inc. and Equi-Analytical Labs.
In case you didn’t know: Texas has impressive diversity in its organic agricultural production. The organic crops grown in Texas encompass staple commodities such as peanuts, cotton, corn, wheat, sorghum, alfalfa, rice, hay, grass, and soybeans. Beyond these staples, Texas farmers cultivate a wide array of vegetables, including lettuce, spinach, onions, tomatoes, peppers, kale, radishes, garlic, and microgreens. The state’s organic fruit production features watermelons, strawberries, blueberries, and various citrus fruits like grapefruits and oranges. Additionally, a variety of herbs such as basil, cilantro, dill, parsley, and other spices are grown organically. Texas also supports the cultivation of flowers, transplants, and specialty crops like mushrooms, aloe vera, and cacti.
Complementing its crop production, Texas’s organic agriculture sector includes a growing livestock industry. Organic farmers in the state produce milk and from milk lots of other dairy products like butter and cheese. There is a growing demand for dairy products nationwide and Texas leads in organic dairy.
Texans also raise organic chickens, turkeys, and cattle, supplying organic beef, poultry, and eggs to consumers. Moreover, Texas organic producers’ market organic beef and dairy replacement livestock, which are sold to organic operations both within the state and across the country. This extensive range of organic crops and livestock products demonstrates Texas’s rich and diverse organic agriculture sector, solidifying its position as a leader in organic farming.
So, what does a typical organic producer in Texas look like? Well this producer is probably located in one of 5 organic “hot spots” in Texas – the High Plains from Amarillo north and doing dairy, grain or silage crops; or maybe the South Plains from Lubbock south to Andrews growing peanuts, cotton or wheat; or possibly in the Central Texas area bounded by Comanche and Waco south to Austin, and growing forage crops for more dairy producers or small acreage vegetables; or maybe in the Gulf Coast area from Beaumont to El Campo growing organic rice; or this organic producer is possibly in the Rio Grande Valley right up against the Mexico border growing citrus and vegetables. With over 576,000 acres certified organic they are scattered across a big state. And they aren’t small either with the average sized organic farm being 1,249 acres. Even the median (right in the middle of the list) acreage at 370 acres is considered large for most states’ organic programs – everything is bigger in Texas!
Ever wondered where organic peanuts are produced? Examining the global map of certified organic peanut farms reveals some interesting patterns. Countries like China, India, Brazil, Argentina, and Togo are major players in organic peanut production, and the United States also makes significant contributions.
Here’s a breakdown of the acreage dedicated to organic production with an emphasis on peanuts in some important countries:
China: Approximately 152,860 acres, with companies like Jilin Jinya Nut Processing Co., Ltd. contributing significantly.
India: Various Organic Grower Groups collectively manage over 103,686 acres of organic peanut farms, demonstrating the effectiveness of cooperative farming.
Brazil: Around 60,592 acres, with Sambazon do Brasil Agroindustrial Ltda contributing a substantial 60,573 acres.
Argentina: About 36,636 acres, with companies like Campos Verdes Argentinos SA and Conosur Foods Argentina SA being key contributors.
Togo: 53,325 acres managed by SOYCAIN TRADING SARL U, making it a significant player in West Africa.
United States: Numerous family-owned farms collectively contribute over 100,000 acres to organic peanut production, with notable producers one in West Texas managing 9,355 acres.
China’s Contribution
China leads with over 152,000 acres dedicated to organic peanut farming. Companies such as Jilin Jinya Nut Processing Co., Ltd. and Wuqiang County Jiyuan Oil Crop Planting Professional Cooperative are significant contributors. Different regions within China add to this market, but China consumes most of what it produces.
India’s Cooperative Farming
In India, numerous Organic Grower Groups (which have group certification) collectively manage over 103,000 acres. These groups demonstrate how small farmers work together to make a significant impact, collaborating to drive success in organic agriculture while keeping costs down.
Brazil’s Organic Production
In Brazil, Sambazon do Brasil Agroindustrial Ltda has 60,573 acres dedicated to organic production, including a substantial amount of peanuts. This company is not only a leader in Brazil but also one of the largest certified organic producers in the world.
Argentina’s Key Players
Companies like Campos Verdes Argentinos SA and Conosur Foods Argentina SA are significant contributors in Argentina, with combined acreage reaching around 36,000 acres. These farms focus on cotton and peanuts, concentrating in regions suitable for these crops.
Togo’s Role in West Africa
In Togo, SOYCAIN TRADING SARL U manages 53,325 acres, contributing significantly to the global peanut supply from West Africa. It raises questions about how much they export!
Family Farms in the USA
Now, let’s consider the United States. While we may not have single operations as large as those in China or Brazil, the U.S. has a network of family-owned farms that collectively contribute over 100,000 acres to organic production. For example, one Texas farmer manages 9,355 acres, making him one of the prominent certified organic peanut producers in the country.
These farms often represent family legacies in organic agriculture, with names appearing across multiple farms in Texas and elsewhere. This reflects the enduring nature of family farming traditions contributing to the organic peanut industry.
Acknowledging Other Contributors
We might have missed highlighting some of the smaller but important players in the organic peanut industry:
Paraguay: Companies like Indugrapa SA and Alemán Paraguayo Canadiense S.A. contribute over 10,760 acres to global organic peanut production.
Bolivia: Finca San Carlos manages 3,118 acres, adding to South America’s contribution.
Vietnam: Companies like FG Products Company Limited and Hebes Company Limited collectively manage over 8,600 acres.
These contributions, while smaller, are vital to the diversity and resilience of the global organic peanut supply chain.
Bringing It All Together
These peanut producers are essential links in the chain that brings organic products from the farm to your table. Organic begins on the farm and remains so until it is packaged.
Most people don’t consider where their peanuts come from or the journey they take. The majority of these farms are committed to sustainable practices, ensuring that organic integrity is maintained every step of the way. With the recent implementation of Strengthening Organic Enforcement (SOE) rules, the entire value chain—including brokers and even transporters—is now certified to ensure accountability.
I was scrolling through my LinkedIn this morning (Monday, July 15, 2024) and saw a post by Dr. Joseph Burke that I just had to check out!
Just click on the picture to read the full research paper!
I am going to cut through all the information in the full-text and give you a look at the mini version. Let’s start with the abstract from the first page.
Abstract: By improving soil properties, cover crops can reduce wind erosion and sand damage to emerging cotton (Gossypium hirsutum L.) plants. However, on the Texas High Plains, questions regarding cover crop water use and management factors that affect cotton lint yield are common and limit conservation adoption by regional producers. Studies were conducted near Lamesa, Texas, USA, in 2017–2020 to evaluate cover crop species selection, seeding rate, and termination timing on cover crop biomass production and cotton yield in conventional and no-tillage systems. The no-till systems included two cover crop species, rye (Secale cereale L.) and wheat (Triticum aestivum L.) and were compared to a conventional tillage system. The cover crops were planted at two seeding rates, 34 (30.3 lbs./ac.) and 68 kg ha (60.7 lbs./ac.), and each plot was split into two termination timings: optimum, six to eight weeks prior to the planting of cotton, and late, which was two weeks after the optimum termination. Herbage mass was greater in the rye than the wheat cover crop in three of the four years tested, while the 68 kg ha (60.7 lbs./ac.) seeding rate was greater than the low seeding rate in only one of four years for both rye and wheat. The later termination timing produced more herbage mass than the optimum in all four years. Treatments did not affect cotton plant populations and had a variable effect on yield. In general, cover crop biomass production did not reduce lint production compared to the conventional system.
This last statement, “cover crops did not reduce lint production,” is hugely significant and yet it is exactly what many organic cotton producers have been saying for years!
Temperature and Rainfall data during the study
To continue the “mini version” of the research let’s turn to the Summary and Conclusions on page 9 of the research paper.
The semi-arid Texas High Plains presents challenging early-season conditions for cotton producers. Cover crops can help mitigate erosion and protect cotton seedlings from wind and sand damage without reducing yields compared to conventional practices if managed appropriately. Effective cover crop management is needed to optimize cotton lint yield compared to conventional tillage systems. We focused on three cover crop management practices: species selection, seeding rate, and termination timing. With regard to species selection, rye produced greater herbage mass in three of the four years. The seeding rate had less of an effect on herbage mass; doubling the seeding rate from 34 to 68 kg ha (30.3 – 60.7 lbs./ac.) did not contribute to increased herbage mass. This change in seeding rate only causes an increase in seed costs, and this trend held true for both species and termination timings. Termination timing had the most significant effect on herbage mass, with a two-week delay in termination timing, increasing herbage mass production from 44 to 63%. At the targeted termination time of six to eight weeks before planting, rye and wheat experienced increased growth as they transitioned from vegetative to reproductive growth. This critical period makes termination timing an essential aspect of herbage mass management. Termination timing can also impact the carbon-to-nitrogen ratio, where higher C:N at later growth stages can increase N immobilization. While water availability or allelopathy concerns are cited as risks for cotton germination and emergence when using cover crops, cotton plant populations were not affected in this study.
Cotton lint yields were not impacted by increasing cover crop herbage mass, except in 2018, when greater wheat biomass resulted in decreased lint yield compared to the conventional system. In each year, wheat or rye at a 34 kg ha (30.3 lbs./ac.) seeding rate and optimum termination timing resulted in cotton lint yields not different than the Conventional Treatment. While yield potentials can differ between years depending on precipitation and temperatures, effective cover crop management can help sustain cotton lint yields when compared to conventional treatments. Rye seed tends to cost more than wheat, but it grows more rapidly and could be terminated earlier to allow for increased moisture capture and storage between termination and cotton planting. (below is the final sentence in the paper and summarizes well the entire study)
“This research demonstrates that with effective cover crop management, the implementation of conservation practices can be successful in semi-arid cropping systems.“
In organic production systems, the challenges to producing an economically successful crop are quite different than in conventional systems. Research has shown that the choice of cultivar is one of the most important decisions in determining performance under organic management.
There are many different target markets for rice, including:
Standard Milled Long or Medium Grain Rice: Commonly used in everyday cooking.
Brown Rice: Retains the bran layer and is considered healthier due to higher fiber content.
Aromatic Rice: Varieties such as jasmine and basmati that are valued for their distinctive fragrances. These are being developed by TAMU Rice Researchers and should be available soon.
Special Purpose Rice: Includes rice for flour production or colored bran rice, which can be marketed for its unique nutritional or aesthetic qualities.
Understanding the preferences of these markets and identifying outlets for specific types of rice may offer added economic opportunities for growers. For example, there is a growing market for aromatic and colored bran rice due to increasing consumer interest in unique and healthful food options.
Importance of Seedling Vigor
In organic production, the use of many conventional seed treatments is prohibited. Therefore, selecting varieties with excellent seedling vigor and seedling quality is crucial. Seedling vigor refers to the ability of seeds to germinate and grow rapidly under field conditions, leading to strong early stand establishment. This is particularly important in organic systems for several reasons:
Early Flooding: Strong early growth allows for an early flood, which is a key practice for weed control in rice fields.
Weed Competition: Vigorous seedlings can outcompete weeds, reducing the need for mechanical or manual weeding.
Disease Resistance: Early and healthy growth can help seedlings better withstand diseases and pest attacks.
Updated Considerations
Recent advancements and trends in organic rice production emphasize several additional factors:
Adaptability to Organic Inputs: Varieties should perform well with organic fertilizers and soil amendments, which release nutrients more slowly than synthetic fertilizers. Varieties developed in organic systems develop beneficial relationships with the microbiome.
Disease and Pest Resistance: With fewer pest control options available, selecting varieties that are resistant to common diseases and insects in the 2 rice growing regions is more critical.
Environmental Resilience: Varieties that can tolerate local environmental stresses such as drought, salinity, or extreme temperatures are preferred.
By focusing on these updated considerations, organic rice growers can better navigate the unique challenges of organic production and tap into diverse market opportunities, ultimately leading to more successful and sustainable farming operations.
Rice Variety Research
Rice varieties have different yield potentials under organic versus commercial production systems. Cultivars such as Tesanai 2, Rondo, and hybrids have high yield potential, as demonstrated in a research plot trial conducted in Texas (see picture below). Based on a 5-year (2015 through 2019) organic commercial production survey, the average yield of XL723 (a popular hybrid variety in Texas, used in organic production) was 4,094 pounds per acre, while Presidio’s yield (a popular inbred variety) was only 2,452 pounds per acre. The selection of high yielding rice varieties with tolerance to weeds and diseases is the key to successful organic rice production.
This is the yield performance of 19 rice varieties and germplasm lines grown organically in Beaumont, Texas in 2015 and 2016 at the Rice Research Center.
More Rice Variety Information
This rice variety test below was conducted by RiceTec in 2023 on the Chriss Schiurring Farm near Garwood.
The measurements provided (bushels and barrels) are generally for rough rice, which includes the hulls and is the form in which rice is typically harvested and initially processed.
Bushel of Rice: A bushel of rough rice typically weighs 45 pounds.
Barrel of Rice: A barrel of rough rice is typically defined as weighing 162 pounds.
Ratoon Rice?
Ratoon rice production involves harvesting a primary rice crop and then allowing the stubble left in the field to regrow and produce a second crop, known as the ratoon crop. This method leverages the remaining growth potential of the plant to produce an additional harvest without replanting, thereby saving time, labor, and resources. Ratoon cropping can increase overall yield and efficiency, although it typically produces a lower yield than the primary crop.
The average yield of a ratoon rice crop is typically about 50-70% of the main crop’s yield. This reduced yield is due to the limited growth potential and shorter growing period of the ratoon crop compared to the main crop. However, ratoon cropping can still be economically beneficial due to the reduced input costs and labor requirements. In many organic rice production fields, the ratoon crop is the profit crop and makes or breaks the farms success!
Seed Rice Varieties
Hybrid Rice Varieties
Hybrid rice is produced by crossbreeding two distinct rice plants with the goal of: higher yields, better disease resistance, and greater environmental stress tolerance compared to conventional varieties. Unlike conventional rice, hybrid rice seeds need to be purchased each planting season, as the hybrid traits do not persist in subsequent generations. Additionally, hybrid rice typically requires a lower planting rate (13-22 lbs. per acre or sometimes more in organic systems) due to its vigorous growth and higher productivity. To read more about how hybrid rice is produced click this link: Hybrid Rice Breeding
RiceTec XL723
For a decade now, XL723 has delivered unsurpassed value through its combination of high yield and outstanding milling yields. Long grain rice. XL723 should be harvested at 18%-20% moisture at first drydown to help maximize grain quality and grain retention.
Superior milling yield
Ideal for straighthead-prone soils
Excellent ratoon potential
Great fit for organic cultivation
RiceTec XP753
Up until 2023, XP753 was the highest-yielding long-grain rice available, providing the greatest net income potential of any competitive rice product. XP753 should be harvested at 18%-20% moisture at first drydown to help maximize grain quality and grain retention.
Protected by RiceTec’s superior disease package
Improved grain retention
Excellent ratoon potential
RiceTec RT7301
Introduced in 2020, RT7301 represents an evolution of RiceTec traditional rice products, capturing the best attributes of XP753 a long grain rice. RT7301 should be harvested at 18%-20% moisture at first drydown to help maximize grain quality and grain retention.
Very high yield potential
Protected by RiceTec’s superior disease package
Improved grain retention
RiceTec RT7302
New in 2023, RT7302 represents the next breeding evolution of RiceTec traditional rice products, capturing the best in yield and grain quality. RT7302 will raise the bar for yield among the RiceTec portfolio of long grain rice. RT7302 be harvested at 18%-20% moisture at first drydown to help maximize grain quality and grain retention.
high yield potential
Protected by RiceTec’s superior disease package
high grain quality
25% amylose content* for a more separate cooked product
*Amylose content in rice refers to the amount of amylose, a type of starch, present in the grains. Rice with intermediate amylose content (typically 20-25%) tends to have a balanced texture—neither too sticky nor too dry. This makes it versatile for a variety of culinary uses, providing a satisfactory chewiness without being overly firm or sticky.
Conventional rice varieties are traditional types of rice that are open-pollinated and can be replanted each season from harvested seeds (there are laws regulating saving some seed varieties, click to read more). They are important for maintaining genetic diversity, which helps ensure crop resilience against diseases and pests. Additionally, they often have unique flavors and qualities prized in local cuisines and cultural practices. Planting rates are in the range of 60-80 or even to 120 lbs. per acre. Check with your sales representative or agronomist. Organic seeding rates can be up to 1.5 times more.
You may see the term “inbred.” Inbred rice varieties are those developed through self-pollination over multiple generations to achieve a stable, uniform genetic makeup. Unlike hybrid varieties, which are produced by crossbreeding different parent lines, inbred varieties maintain consistent traits across generations when their seeds are replanted. They are often valued for their stability, specific traits, and adaptability to local growing conditions.
Dyna-Gro DG245L
Semi-dwarf, early maturing, long-grain variety with exceptional milling yields and grain quality. Medium plant height of 36 inches and great stalk strength for lodging resistance and storm tolerance. Very stable yields in five years of research with excellent ratoon crop potential. Intermediate gel temperature* and intermediate amylose content.
*Gel temperature refers to the temperature at which the rice starch granules gelatinize or become sticky during cooking. Rice varieties with intermediate gel temperature generally produce grains that are soft but not mushy when cooked, offering a desirable texture that balances between firmness and tenderness.
Dyna-Gro DG263L
High yielding long grain variety with excellent quality with excellent disease package including blast and smuts. Plant height and stalk strength for lodging resistance and storm tolerance with a proven field performance. Uniform grain size and very good miller (58/69). Lower seeding rates than most varieties (45-65 lbs. per acre).
Dyna-Gro DG353M
High yielding medium grain variety with excellent quality with uniform grain size and a very good miller (60/70). Great standability and favorable plant height (36 inches). Very stable yields in four years of research. Lower seeding rate (50-75 lbs. per acre) than other conventional medium grain inbreds.
Horizon Ag CL153
CL153 is an early, semi-dwarf, long-grain Clearfield rice variety developed by the LSU AgCenter H. Rouse Caffey Rice Research Station. Known for its excellent yield potential and high head rice yields with minimal chalkiness, CL153 offers several agronomic advantages. It has a yield potential comparable to or slightly below that of CL151 but with better lodging resistance. The variety also features excellent grain length, translucency, and whole milled rice output, meeting industry standards.
In terms of disease resistance, CL153 is moderately susceptible to blast, Cercospora, bacterial panicle blight, and straighthead, but it is susceptible to sheath blight. It carries the Pita gene, providing broad-spectrum resistance to common blast races in the southern USA. This makes it a robust choice for growers seeking a variety with good disease management traits.
Horizon Ag CLL16
CLL16 is a long-grain, conventional height, Clearfield rice variety developed by the University of Arkansas System Division of Agriculture. It boasts excellent yield potential and stability, maintaining strong yields even with later planting dates. The variety has excellent seedling vigor and is a few inches taller than typical Louisiana Clearfield varieties, but it is moderately resistant to lodging.
CLL16 features the Pita gene (not a GMO), providing strong resistance to blast, and the CRSP2.1 gene (not a GMO), offering resistance to narrow brown leaf spot. It is moderately susceptible to Cercospora infection on the stem, sheath blight, and bacterial panicle blight. However, milling yields and ratoon potential are observed to be lower than other some other varieties.
Organic rice farmers looking for a reliable variety will find CLL16 to be a strong contender due to its consistent performance, high milling quality, and industry-leading blast resistance. In university tests, CLL16 has shown good rough rice yields, averaging higher than the Diamond variety, making it a comprehensive choice for rice farmers.
Horizon Ag CLL18
CLL18 is a long-grain, conventional height Clearfield rice variety developed by the University of Arkansas System Division of Agriculture. It boasts excellent yield potential and stability, maintaining strong yields even with later planting dates. With excellent seedling vigor, CLL18 is slightly taller than typical Louisiana Clearfield varieties but is moderately resistant to lodging. However, its milling yields are observed to be lower than other Clearfield varieties.
CLL18 does not contain the Pita blast resistance gene and is moderately susceptible to blast, making it less suitable for areas prone to this disease. It does contain the CRSP2.1 gene, providing resistance to narrow brown leaf spot, but is moderately susceptible to Cercospora infection on the stem, sheath blight, and bacterial panicle blight. Despite these susceptibilities, CLL18 has consistently outyielded CLL16 by about 5% in Arkansas trials. Its earlier maturity makes it a good planting partner with CLL16, allowing farmers to stagger their harvests effectively.
Stratton Jupiter
A short-season, semi-dwarf, medium grain with excellent yield potential and milling quality. It is a small grain size but has moderate resistance to bacterial panicle blight.
Stratton Titan
Titan is a very early, short-stature, medium-grain rice variety known for its excellent yield potential, often comparable to or better than Jupiter. It matures about a week earlier than Jupiter and is similar in height. Titan has a preferred large grain size but is moderately susceptible to blast and bacterial panicle blight. It is important to harvest Titan at the correct moisture level, as milling yields drop off significantly when harvested at lower moisture. This short-season variety is valued for its robust performance and high yield potential.
Stratton Cheniere
A short-season, semi-dwarf long grain with excellent yield potential and milling quality comparable to Cypress. An early, high-yielding, high-quality, rice variety with, good lodging resistance and moderate resistance to straighthead. It is moderately susceptible to blast and bacterial panicle blight and susceptible to sheath blight and Cercospora. The variety displays excellent grain quality characteristics, has a higher amylose content and cooks less sticky than typical U.S. long grains.
Stratton Jewel
A mid-season long grain variety with good yield potential and milling yield. Susceptible to straighthead. Moderately susceptible to sheath blight, blast, Cercospora, false smut and lodging. Moderately resistant to bacterial panicle blight.
Stratton Diamond
A mid-season, long-grain variety with excellent yield potential and good milling quality. Very good straw strength. Susceptible to blast and sheath blight, moderately susceptible to bacterial panicle blight. Very susceptible to false smut
Texas A&M AgriLife Organic 