2008 Joint Annual Meeting (5-9 Oct. 2008): RiceCAP: Mapping Rice Milling Yield QTL In A U.S. Long Grain Cross.
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655-3 RiceCAP: Mapping Rice Milling Yield QTL In A U.S. Long Grain Cross.



Tuesday, 7 October 2008: 10:00 AM
George R. Brown Convention Center, 370A
Anna M. McClung1, Robert Fjellstrom1, James Oard2, Steve Linscombe2, Karen Ann Kuenzel Moldenhauer3, Farman Jodari4, Xavier Lacaze5, Sally Leong6, Henry Nguyen7, Guo-Liang Wang8 and J. Clare Nelson5, (1)USDA-ARS, 2890 Hwy 130 E, Stuttgart, AR 72160-1090
(2)School of Plant, Environmental, and Soil Sciences, Louisiana State University, 104 Sturgis Hall, Baton Rouge, LA 70803
(3)2900 Highway 130E, University of Arkansas, University of Arkansas, Rice Research Institute & Extension, Stuttgart, AR 72160
(4)California Rice Research Bd., PO Box 306, Biggs, CA 95917
(5)Plant Sciences, Kansas State University, 4024 Throckmorton, Manhattan, KS 66506
(6)Plant Pathology Univ. Wisconsin, USDA ARS, 1630 Linden Ave., Madison, WI 53506
(7)University of Missouri, National Center for Soybean Biotech, 40 Agriculture Bldg. Univ. Mo, Columbia, MO 65211-7140
(8)Ohio State University, 481C Kottman, 2021 Coffey Rd., Columbus, OH 43210
Whole grain milling yield is a major determinant of rice crop value. Because this trait is under quantitative inheritance and is sensitive to variation due to the production environment and post-harvest handling, it is difficult to improve. This study was conducted as part of the USDA NRI RiceCAP program to identify QTL associated with rice milling quality. A mapping population of 300 recombinant inbred lines was derived from a cross between two rice cultivars, Cypress (high milling yield) and LaGrue (low milling yield). The lines were genotyped with 106 SSR markers and evaluated for milling yield, grain fissuring, and grain dimension traits under field conditions in Stuttgart, AR and Crowley, LA in 2006 and 2007. QTL for milling yield identified on chromosomes 1, 2 and 10 accounted for 18 and 10% of genotype and genotype x environment variation in whole milling yield, respectively. The QTL on chromosome 10 showed a pleiotropic effect on fissuring susceptibility. All milling QTL were subject to strong interactions with the environment. Environmental characterization based on daily weather records was carried out for each year–location combination. Based on factorial regression, environmental covariates incorporating humidity variation during the grain filling period explain a large part of the QTL x E interaction for individual QTLs.

 

See more of: Genetic Mechanisms for Enhancing Yield and Quality
See more of: C07 Genomics, Molecular Genetics & Biotechnology