Epistasis plays an important role as genetic basis of heterosis in rice

Science in China. Series C, Life Sciences
Y SibinM A Maroof

Abstract

The genetic basis of heterosis in rice was studied in a cross between Zhenshan 97 and Minghui 63, the parents of the best hybrid widely used in rice production in China. Field data for yield and yield components traits were collected over two years from 240 F(2:3) families of this cross planted in replicated field trials. These families were assayed with 151 marker loci that were polymorphic between the parents and a linkage map was constructed with Mapmaker analysis. A total of 32 quantitative trait loci (QTLs) were identified for yield and the three component traits: 12 QTLs were detected in both years and the remaining 20 QTLs were observed in only one year. A search for the entire genome by using two-way analyses of variance with all possible two-locus combinations detected a very large number of significant digenic interactions involving both the QTLs resolved by single-locus analysis and loci that did not show significant effects by single-locus analysis. Many of the interactions were simultaneously detected in both years. Partitioning of the epistatic interactions recovered all three types of interactions, i. e. additive by additive, additive by dominance and dominance by dominance, for all the traits. Some of the epista...Continue Reading

References

Aug 1, 1992·American Journal of Medical Genetics·A K SharmaS S Agarwal
Oct 1, 1993·Molecular & General Genetics : MGG·K S Wu, S D Tanksley
Aug 19, 1997·Proceedings of the National Academy of Sciences of the United States of America·S B YuM A Saghai Maroof

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Citations

Jun 5, 2012·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Brigitte UwimanaRichard G F Visser
Jul 1, 2012·Chinese Science Bulletin = Kexue Tongbao·Zhu ZhihongXu Haiming

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