Rice Variety Profile for Calmochi-203

High yielding, semi-dwarf, early-maturing, glabrous, waxy, short-grain

RES Rice Varieties

Variety: Calmochi-203

  • Former ID: 09Y2141
  • Year: 2015

Calmochi-203 is a high yielding, semi-dwarf, early-maturing, glabrous (smooth hull), waxy (glutinous or sweet), short-grain rice cultivar.It was developed by the California Cooperative Rice Research Foundation, Inc. (CCRRF) at the Rice Experiment Station (RES), Biggs, CA and released to growers in April 2015. Calmochi-203 is protected under the US Plant Protection Act, Title 5 (to only be sold as a class of certified seed), as well as a US Plant Utility Patent. Calmochi-203 is available exclusively to California rice growers, export of seed is prohibited, and the use in genetic or breeding research requires a Material Transfer Agreement.

Pedigree and Breeding

Its pedigree is M7//D51/R57/3/M-302/4/Cal-mochi-101(87Y259)/5/Calmochi-101/6/NFD-108/7/M102/CM101/3/ Akenohoshi//Calpearl/Calmochi-101. 87Y259 is a high yielding, glabrous, waxy short-grain line developed by RES. Calmochi-101 is a very early maturing, pubescent, semi-dwarf, waxy rice developed and released by CCRRF in 1985 and the current waxy rice in production. NFD108, is a high yielding, early maturing, pearl type, pubescent grain, waxy rice released by N.F. Davis. Akenohoshi, released in Japan, is non-glutinous, medium to tall, late maturing with high spikelet number and sensitivity to cool temperature. Calpearl is a high-yielding, pubescent medium grain, released by N.F. Davis. NFD108, Calpearl, M7, M-302, and M-102 are no longer in commercial production. Calmochi-203 was tested in the 2010-14 University of California Cooperative Extension (UCCE) statewide tests under the experimental designation 09Y2141.

Agronomic Characteristics

Table 1 contains a summary of the agronomic and quality data collected in the UCCE Statewide Yield Tests and at the RES. Seedling vigor scores, days to heading, lodging, and disease resistance value for Calmochi-101 and Calmochi-203 were similar. Calmochi-203 takes about 10 days longer to reach harvest maturity than Calmochi-101 due to its larger kernel, higher yield, and glabrous hull. Calmochi-203 significantly out yielded Calmochi-101 in all comparisons averaging 9,650 and 7,590 lb/acre, respectively, for a 27% yield advantage. Commercial seed production field yields ranged from 93 to 107 cwt/acre in 2015.

It has no major resistance gene to the blast pathogen present in California, however, the field resistance of Calmochi-203 to blast is not known. Growers are recommended to bleach treat seed for Bakanae. No marked difference in sensitivity to standard rice herbicides has been observed, however commercial experience is limited.

Milling and Quality

In RES milling tests from 2012 to 2014, head rice percentage of Calmochi-203 ranged from 64 to 66%, while it ranged from 61 to 64% for CM-101. When averaged across years, head rice percentage was higher in Calmochi-203 at 65% than Calmochi-101 at 63%. Calmochi-203 kernels are larger, heaver and rounder. Physico-chemical analysis and mill/market evaluation did identify some cooking quality differences between Calmochi-203 and Calmochi-101. Growers should confirm with their buyer/mill/marketer for suitability for their rice processing needs before contracting the crop.

Calmochi-203: Agronomic and quality data from the UCCE Statewide Yield Tests and the RES 2010-2014


Area of Adaptation

Grain yield trend analysis indicates that Calmochi-203 is well suited in California rice growing locations and can achieve high yields in favorable production areas or perhaps under high-input production system. Results of San Joaquin County and cold greenhouse tests indicate that it is not as cold temperature blanking resistant as Calmochi-101.

Variety Photos
  • Ashley Averitt

    Maintenance and Operator

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

  • Deven Benson

    Maintenance and Operator

    Deven 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.

  • Gabriel Janish

    Plant Breeder Assistant

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

  • 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.