Epistasis for Three Grain Yield Components in Rice (Oryza sativa L.)

INVESTIGATIONS

Epistasis for Three Grain Yield Components in Rice (Oryza sativa L.)

Z. Li, SRM. Pinson, W. D. Park, A. H. Paterson and J. W. Stansel
Department of Soil and Crop Sciences, Texas A{complex}M University, College Station, Texas 77843, Texas A{complex}M University Agricultural System Research and Extension Center, Beaumont, Texas 77713

The genetic basis for three grain yield components of rice, 1000 kernel weight (KW), grain number per panicle (GN), and grain weight per panicle (GWP), was investigated using restriction fragment length polymorphism markers and F(4) progeny testing from a cross between rice subspecies japonica (cultivar Lemont from USA) and indica (cv. Tequing from China). Following identification of 19 QTL affecting these traits, we investigated the role of epistasis in genetic control of these phenotypes. Among 63 markers distributed throughout the genome that appeared to be involved in 79 highly significant (P < 0.001) interactions, most (46 or 73%) did not appear to have ``main'' effects on the relevant traits, but influenced the trait(s) predominantly through interactions. These results indicate that epistasis is an important genetic basis for complex traits such as yield components, especially traits of low heritability such as GN and GWP. The identification of epistatic loci is an important step toward resolution of discrepancies between quantitative trait loci mapping and classical genetic dogma, contributes to better understanding of the persistence of quantitative genetic variation in populations, and impels reconsideration of optimal mapping methodology and marker-assisted breeding strategies for improvement of complex traits.

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				K. Ishimaru Identification of a Locus Increasing Rice Yield and Physiological Analysis of Its Function Plant Physiology, November 1, 2003; 133(3): 1083 - 1090. [Abstract] [Full Text] [PDF]

				L. L. Hinze and K. R. Lamkey Absence of Epistasis for Grain Yield in Elite Maize Hybrids Crop Sci., January 1, 2003; 43(1): 46 - 56. [Abstract] [Full Text] [PDF]

				M. C. Ungerer, C. R. Linder, and L. H. Rieseberg Effects of Genetic Background on Response to Selection in Experimental Populations of Arabidopsis thaliana Genetics, January 1, 2003; 163(1): 277 - 286. [Abstract] [Full Text] [PDF]

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				Z.-K. Li, L. J. Luo, H. W. Mei, D. L. Wang, Q. Y. Shu, R. Tabien, D. B. Zhong, C. S. Ying, J. W. Stansel, G. S. Khush, et al. Overdominant Epistatic Loci Are the Primary Genetic Basis of Inbreeding Depression and Heterosis in Rice. I. Biomass and Grain Yield Genetics, August 1, 2001; 158(4): 1737 - 1753. [Abstract] [Full Text] [PDF]

				L. J. Luo, Z.-K. Li, H. W. Mei, Q. Y. Shu, R. Tabien, D. B. Zhong, C. S. Ying, J. W. Stansel, G. S. Khush, and A. H. Paterson Overdominant Epistatic Loci Are the Primary Genetic Basis of Inbreeding Depression and Heterosis in Rice. II. Grain Yield Components Genetics, August 1, 2001; 158(4): 1755 - 1771. [Abstract] [Full Text] [PDF]

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				Y. Ohno, H. Tanase, T. Nabika, K. Otsuka, T. Sasaki, T. Suzawa, T. Morii, Y. Yamori, and T. Saruta Selective Genotyping With Epistasis Can Be Utilized for a Major Quantitative Trait Locus Mapping in Hypertension in Rats Genetics, June 1, 2000; 155(2): 785 - 792. [Abstract] [Full Text]

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