Variety: Calhikari-202

Former ID: 04Y177

 

Introduction:

           Calhikari-202 is an early maturing, semidwarf, rough hulled (pubescent), premium quality short-grain 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 2012. Calhikari-202 is protected under the US Plant Protection Act, Title 5 (to only be sold as a class of certified seed) as well as an US Plant Utility Patent.

 

Pedigree and Breeding:

           Calhikari-202 is an early selection from a cross of a sister line of Calhikari-201 with Hitomebore and has the pedigree Koshihikari*2/S-101//Koshihikari/S-101/3/Hitomebore. Koshihikari is more than half-century old, tall, late maturing, lodging susceptible, pubescent Japanese premium short grain famous for its quality. Hitomebore is a short-statured, early maturing, pubescent, lodging susceptible, premium short grain also from Japan. S-101 is very early, pubescent semidwarf variety developed at the Rice Experiment Station and is no longer in production today. The experimental designation was 04Y177. Calhikari-202 was developed as an alternative to Calhikari-201 and for the premium short grain market in California.

 

Agronomic Characteristics:

            Calhikari-202 seedling vigor, based on seedling vigor scores is below Calhikari-201 and California medium grains. No marked difference in sensitivity to standard rice herbicides from the parent varieties has been observed, however commercial experience is limited. Calhikari-202 maturity as measured at days to 50% heading averages about 3 days earlier than Calhikari-201. Lodging is a highly variable trait to measure, but testing shows Calhikari-202 is more susceptible than Calhikari-201 and much more susceptible than M-206. UCCE 2008-11 plot yields averaged 8480, 8810, and 9580 lbs/acre for Calhikari-201, Calhikari-202, and M-206, respectively. In 2010-12, Calhikari-202 gave higher yields that Calhikari-201 in 20 of 31 tests and averaged 8620 and 8220 lbs/acre, respectively.

           Calhikari-202 consistently gave lower stem rot scores than very susceptible Calhkari-201. Growers are still recommended to bleach treat seed for Bakanae. Calhikari-202 is susceptible to the race of blast disease found in California, however the field resistance of Calhikari-202 to blast is not known.

 

Milling and Quality:

           Calhikari-202 has given higher milling yields than Calhikari-201 in studies at RES. Optimum head rice yields were achieved at 21-22% harvest moisture and can decline rapidly below 18%. M-206 by contrast shows a lower optimum harvest moisture and more stable response. Japanese varieties are often harvested at higher moistures to minimize kernel fissures. Kernels of Calhikari-202 are smaller than Calhikari-201 and Koshihikari.

             Physicochemical cooking quality tests values for % protein content, % apparent amylose and alkali spreading value are closer to Koshihikari than Calhikari-201 ranking by as follows:Koshihikari>Calhikari-202>Calhikari-201. In several years of testing at RES, Calhikari-202 topped Calhikari-201 in quality parameters. However, the level of cooking and eating quality is slightly below the level of Koshihikari quality.

 

Area of adaptation:

The performance data collected at RES and by UCCE indicates that because of its susceptibility to low temperature blanking Calhikari-202, like Calhikari-201, is not recommended for production in cold growing locations and late planting situations. Seed growers in 2012-13 reported that it performed well for a premium quality short grain variety.

 

RES Rice Varieties