Advances in rice genetics by D S Brar; B Hardy

By D S Brar; B Hardy

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1 (100) Ikehashi H, Araki H. 1986. Genetics of F1 sterility in remote crosses of rice. Proceedings of the International Rice Genetics Symposium. Los Baños (Philippines): International Rice Research Institute. p 119-130. Kabaki N, Hasegawa H, Yamaguchi H, Kon T. 1992. Growth and yield of japonica-indica hybrid rice. Bull. Hokuriku Natl. Agric. Exp. Stn. 34:111-139. Maruyama K. 1989. Hybrid rice breeding. Nogyo Gijutsu 44:183188. ) Shinjo C. 1975. Genetic studies of cytoplasmic male sterility and fertility restoration in rice.

0 t ha–1 over the best inbred check at one or more of the test locations. Interestingly, a great majority of the restorers (>86%) showing heterosis were from the medium group, emphasizing the need to select restorers from this group to develop heterotic hybrids. In another experiment, 28 F6 lines derived from a cytoplasmic male sterile (CMS)-based hybrid, IR62829A/WGL 3962, were crossed with IR62829A to assess the potential of newly developed isocytoplasmic restorers. The F1 crosses were evaluated along with the original hybrid, IR62829A/WGL 3962.

However, the relationship between heterosis and molecular genetic diversity was usually weak for most of the traits studied in the two-line hybrids. Rapid progress in genomics research and the development of new and simpler DNA-based markers have stimulated efforts to predict the performance of hybrids based on molecular data of their parents, thus speeding up the selection process in hybrid breeding programs. Microsatellites or simple sequence repeats (SSRs) are powerful DNA markers that can serve as tools in assessing the diversity of parental cultivars at the DNA level, yielding much more information than if diversity assessment were based on phenotype alone.

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