Rice Cultivar 'L-206'

CALIFORNIA COOPERATIVE RICE RESEARCH FOUNDATION, INC.

RICE EXPERIMENT STATION

BIGGS, CALIFORNIA 95917-0306

 

 

CALIFORNIA AGRICULTURAL EXPERIMENT STATION

UNIVERSITY OF CALIFORNIA

OAKLAND, CALIFORNIA 94612

 

and

 

UNITED STATES DEPARTMENT OF AGRICULTURE

AGRICULTURAL RESEARCH SERVICE

WASHINGTON, DC 20250

 

 

 

NOTICE OF NAMING AND RELEASE OF RICE CULTIVAR L-206

 

The California Cooperative Rice Research Foundation, Inc. (CCRRF), the California Agricultural Experiment Station (CAES), and the United States Department of Agriculture,Agricultural Research Service (USDA-ARS), announce the naming and release of a new rice cultivar L-206.

 

L-206 is a very early to early maturing, glabrous, long-grain selection from the crossR17864 made at the Rice Experiment Station (RES), Biggs, CA in 1992. Its pedigree is L-203/9039614. L-203 is an early maturing semidwarf l ong-grain cultivar released by CCRRFin 1992. The male parent, 9039614 is an F6 selection from the cross Lemont/3/R1588/L-201//R1588/Labelle. Lemont i s a semidwarf long-grain cultivar developed by the USDA-ARS,Beaumont, TX. R1588 is a selection of a cross between an unknown introduction, PI321161, and a long-grain selection from RES. L-201 is an intermediate height variety releasedby CCRRF in 1979. Labelle is a very early long-grain variety with good cooking and milling qualities released by USDA-ARS, Beaumont, TX in 1973. L-206 was tested in the University of California Cooperative Extension (UCCE) Statewide Yield Tests 2000 through 2005 underthe experimental designation 99-Y-469.

 

Seedling vigor of L-206 is similar to L-205 and slightly lower than M-202. Days to50% heading is an average of 4 days earlier than both L-205 and M-202. L-206 is 6 cm shorter than L-205 and 11 cm shorter than M-202. Lo dging potential is not significantly higher than L-205, however, due to earlier maturity plants may lean due to excessive dryness after harvest maturity. Susceptibility to cold induced blanking (greenhouse blanking score), and reactions tostem rot and aggregate sheath spot pathogens of L-206 was not significantly different from L-205 and M-202.

 

L-206 has shown significantly higher yield potential than M-202 at RES location andequal yield potential to L-205 and M-202 at the Sutter-East test location in 2000 to 2005 tests. Yields at colder locations of Yolo and San Joaquin counties and the warmest location of Glenncounty were not as competitive as M-202. Grain Yields of L-206 tested in additional locations during 2005 were not significantly different from L-205 or M-202.

 

Milled rice kernels of L-206 are slightly longer than Cypress, a predominant SouthernUS variety. Milled kernels of L-206 are slightly longer than L-205 and shorter than L-204. Average % head rice of L-206, L-205, and L-204 were 62.8, 63.4 and 63.6% respectively, in2001 to 2005 milling studies. Recommended harvest moisture is 17 percent.

 

Analysis provided by the USDA-ARS Rice Research Unit, Beaumont, TX, indicated thatL-206 is the same as L-204 averaging 22.8 percent apparent amylose content with intermediate type alkali spreading values, and is similar tothe traditional southern long-grain varieties,. The primary difference in the cooking qualities of L-206 and L-204 is the amylographic profile shownby RVA values. Cool paste viscosity and setback values of L-206 are slightly higher than L-204, which seems to be associated with lower stickiness exhibited by the cooked grains of L-206. Cooked rice of L-206 was preferred by taste panelists over L-204 and L-205.

 

L-206 should be adapted to all but the coolest rice growing areas of Yolo and San Joaquin counties. Greenhouse tests indicate that L-206 has slightly higher resistance to cold inducedblanking than L-204. In the warmest areas of Californias rice production region, growing season for very early varieties such as L-206 may not be long enough for maximum production.

 

Application is being made to protect L-206 under the U.S. Plant VarietyProtection Act, Title V option, and for utility patents. Breeder and Foundation seed of these cultivars will be maintained by California Cooperative Rice Research Foundation, P.O. Box 306, Biggs, CA 95917-0306.

 

Each agency will make such news releases and other publicity as it considers appropriateon or after the release date of April 15, 2006.

Rice Experiment Station