Rice Variety Profile for S-202

Early, glabrous, very high yielding conventional short grain variety.

RES Rice Varieties

Variety: S-202

  • Former ID: 10Y2043
  • Year: 2019
Pedigree and Breeding

S-202 is a very high-yielding, early-maturing, semi-dwarf, temperate Japonica, conventional short grain developed using the pedigree breeding method. It is a complex cross made in the spring of 2004 with the cross designation R29273 at the Rice Experiment Station in Biggs, CA. The pedigree of 10Y2043 is as follows: R29273 = “03Y324/02Y194”, where 03Y324 = “84Y254//M-102/85Y13/3/DENGYU1/88Y013” and 02Y194 = “84Y254/ 85Y013//CP/CM-101/3/S-102”. The expanded and official pedigree of 10Y2043 is therefore written as “84Y254//M-102/85Y13/3/DENGYU1/88Y013/4/ 84Y254/85Y013//CM-101/3/S-102”. The rice lines 03Y324 and 02Y194 were advanced breeding lines with complex pedigrees developed at RES and tested in preliminary yield trials and statewide yield test (03Y324) but were not released as a variety for commercial production. Some notable rice varieties in their pedigrees included S-102, a very early maturing, pubescent, semi-dwarf, conventional short grain released in 1996 by CCRRF and still in commercial production. Calpearl is a high-yielding, pubescent medium grain, released by N.F. Davis. NFD108. Calmochi-101 is a very early maturing, pubescent, semi-dwarf, cold tolerant, waxy rice developed and released by CCRRF in 1985. M-102 is a very early medium grain, glabrous, semi-dwarf rice developed and released in 1987 by RES.  Calpearl and M-102 are no longer in commercial production.

S-202 is an excellent alternative to S-102 in terms of grain yield and quality and is acceptable to the rice market as evaluated internally and externally for quality.

Agronomic Characteristics

The overall grain yield of S-202 averaged 10,360 lbs/acre compared to 8,800 lb/acre for S-102. In 33 of the 37 experiments conducted from 2015 to 2018, S-202 registered significant yield differences over S-102, with an overall average yield advantage of 18%. The narrowest yield advantage were registered in the cold location of San Joaquin (-2%) and South Yolo (5%), but the difference was not statistically different. This indicated that the grain yield of 10Y2043 may not reach its potential if planted in colder environment.

The overall number of days to 50% heading for S-202 was 83 days compared to 80 days for S-102. Plant height was measured at 93 cm and 97 cm for 10Y2043 and S-102, respectively. Both have approximately similar seedling vigor, though the tendency to lodge is higher in S-202.

Milling and Quality

The grains of S-202 are smaller and lighter compared to S-102.  The 1000-grain weight of S-202 was 21.1 grams compared to 25.3 grams for S-102. It is shorter (length=5.11 compared to 5.4) and narrower (width=3.04 compared to 3.20) but with approximately similar length/width ratio of 1.68. The grain dimensions and grain weight of S-202, though significantly smaller than S-102 are bigger compared to premium quality short grains such as CH-201 and CH-202. With slightly smaller grains compared to S-102, caution should be observed when comingling with S-102 especially if grain uniformity of milled rice product is desired.

Milling data showed that the head rice yield of S-202 is better than S-102 when harvested at moistures from 18-22%. When cut at moistures above 22% or below 18%, head rice yield tend to drop for S-202 and S-102. A 2-kilogram paddy rice sample harvested at 18% moisture content submitted for milling evaluation to FGIS, USDA in Sacramento, CA, indicated that S-202 had a milling yield of 56%/71%, Head/Total.

RVA and Quality Evaluation

The average apparent amylose content of S-202 and S-102 were 14.4% and 16.0%, respectively, while the milled rice protein content were 7.5 and 6.2%, respectively. Both have low gel type.

Based on the results of external evaluation performed by a marketing organization in 2017, S-202 scored better than S-102 in terms of chalkiness, transluscency, bran streaks, uniformity and overall appearance. For cooked rice, S-202 has better taste, cohesiveness but less glossiness. Overall market acceptability is favorable and deemed acceptable to the rice market.

S-202: Apparent amylose, protein content and gel type of S-102 and 10Y2043

Entry Apparent Amylose (%) Protein, Brown (%) Protein, White (%) Gel Type
S-102 16.00 6.90 6.20 Low
S-202 14.40 8.20 7.50 Low

S-202: RVA profile of S-202 and S-102 measured at RES

ID Peak Trough Break down Final Viscosity Setback Pasting Temp
S-102 253 141 112 250 -3 93
S-202 260 121 139 219 -41 91

Blanking and Disease Screening Test

In San Joaquin, the average blanking was 1.46% and 1.96% for S-202 and S-102 respectively, whereas in the greenhouse, the average scores are 61.63 and 55.48%, respectively.  Although the level of low temperature-induced blanking or spikelet sterility in San Joaquin appeared to be low, the agronomic performance of less adapted rice lines are affected and exhibited as delay in heading and low grain yield. Likewise, the high coefficient of variation of cold screening under field and greenhouse are very high that interpretation of relative cold tolerance was taken with caution.

For screening for reactions to stem rot, aggregate sheath spot, and blast diseases of S-202 and S-102, results indicate that S-202 relative to S-102 had higher susceptibility to blast, stem rot and aggregate sheath spot.

Variety Photos
  • Collier Robinson

    Plant Breeder Assistant

    Collier is a plant breeder assistant for the California Cooperative Rice Research Foundation (CCRRF).

  • Matthew Morgan

    Maintenance and Operator

    Matthew is a maintenance and operator of California Cooperative Rice Research Foundation.

  • Justin Valencia

    Maintenance and Operator

    Justin is a maintenance and operator of California Cooperative Rice Research Foundation.

  • Randy Jones

    Field Supervisor

    Randy is the field supervisor of California Cooperative Rice Research Foundation.

  • Joe Martin

    Plant Breeder Assistant

    Joe is a plant breeder assistant for the California Cooperative Rice Research Foundation (CCRRF). His primary focus at CCRRF is to assist in the short grain breeding program. He received his BS in Plant Biology from the University of California Davis. He is currently enrolled in the Plant Breeding Academy at UC Davis to help further his knowledge in plant breeding.

  • Davinder Singh

    Plant Breeder Assistant

    Davinder is a plant breeder assistant for the California Cooperative Rice Research Foundation (CCRRF). His primary focus at CCRRF is to assist in the long grain breeding program.

  • Ravinder Gakhal

    Senior Plant Breeder Assistant

    Ravinder is a senior plant breeder assistant for the California Cooperative Rice Research Foundation (CCRRF). His primary focus at CCRRF is to assist in the medium grain breeding program.

  • Baldish Deol

    Senior Plant Breeder Assistant

    Baldish is a senior plant breeder assistant for the California Cooperative Rice Research Foundation.

  • George Yeltatzie

    Genetics Lab Technician

    George is the genetics lab technician for the California Cooperative Rice Research Foundation.

  • Frank Maulana, Ph.D.

    Short Grain Breeder

    Dr. Frank Maulana is a rice breeder for the California Cooperative Rice Research Foundation (CCRRF). He is leading a short grain breeding program to develop improved short grain rice varieties for five market classes, including conventional or regular, low amylose, sweet or waxy, premium quality and arborio or bold grain. The objectives of the program include developing rice varieties with high and stable yield, high milling grain yield, seedling vigor, cold tolerance, lodging resistance, and disease resistance. He received a BS in Crop Science from Lilongwe University of Agriculture and Natural Resources (LUANAR) in Malawi. Then, he worked as a plant breeder at the Agricultural Research and Extension Trust (ARET) for five years. He then went on to obtain PhD and MS in Plant Breeding and Genetics from Kansas State University (KSU), Manhattan, KS. Before joining CCRRF, he was a postdoctoral researcher at Louisiana State University (LSU) AgCenter-Rice Breeding program. His research project at LSU focused on implementation of genomic selection in an applied rice breeding program.

  • Gretchen Zaunbrecher, Ph.D.

    Genetics Lab Director

    Dr. Zaunbrecher is the Genetics Lab Director for the California Cooperative Rice Research Foundation (CCRRF).  The Genetics Lab utilizes marker assisted analysis to provide valuable genetic information to assist the breeders in rice varietal improvement.  In addition, through traditional mutational breeding as well as gene editing, we hope to develop new varieties of rice with enhanced yield, herbicide, and disease resistance, and other agronomically valuable traits.

  • Nirmal Sharma, Ph.D.

    Long Grain Breeder

    Dr. Nirmal Sharma is a plant breeder for the California Cooperative Rice Research Foundation (CCRRF), leading the long grain breeding project and incorporating disease resistance, high milling yield, seedling vigor, cold tolerance, and herbicide resistance into future rice varieties. He received his BS in Agriculture and MS in Biotechnology from Bangladesh Agricultural University. Then, he worked as a breeder in the Plant Breeding Division of the Bangladesh Rice Research Institute (BRRI) for several years. Next, he moved to the United States to pursue his PhD in crop sciences at the University of Illinois at Urbana-Champaign (UIUC). Upon completing his degree, he was a postdoctoral fellow at the Noble Research Institute before joining CCRRF.

  • Teresa B. De Leon, Ph.D.

    Medium Grain Breeder

    Dr. Teresa B. De Leon is currently leading the improvement and variety development of CCRRF medium grain project. She previously led the short grain breeding project from 2018-2021. Prior to her employment at the station, she worked as Plant Geneticist to University of California Davis for identification, origin, and prevention of weedy red rice. She developed pre-breeding and introgression lines of Louisiana rice with improved salinity tolerance for Louisiana State University Agricultural Center. As Assistant Scientist and Research Scholar, she has also worked at the International Rice Research Institute (IRRI) and University of the Philippines at Los Banos on disease resistance of rice and other crops. With several years of experience in rice research and development, Dr. De Leon is integrating the use of conventional and molecular tools in breeding for medium grains with high yield potential, high grain quality, wide adaptation, cold tolerance, disease and herbicide resistance, and most importantly, a rice with excellent cooking and taste quality for consumers.

  • Emily Schaaf

    Executive Assistant

    Emily is the executive assistant of California Cooperative Rice Research Foundation.

  • Dustin Harrell, Ph.D.


    Dr. Dustin Harrell has been the Director of the California Cooperative Rice Research Foundation Rice Experiment Station since November of 2021. Prior to his current leadership position, he held positions as the Resident Coordinator of the LSU AgCenter’s Rice Research Station, the Extension Rice Specialist for the state of Louisiana, and the project leader for the Rice Fertility and Agronomy Project at the LSU Rice Experiment Station.

  • Kirk Troughton

    Maintenance and Operator

    Kirk is a maintenance and operator of California Cooperative Rice Research Foundation.