Hybrid rice cultivation area is steadily expanding around the world, especially in southern asia. Heterosis and inheritance of fertilityrestorer genes in rice jakkrit seesang, prapa sripichitt, tanee sreewongchai. Ppt heterosis powerpoint presentation free to view. Current status and future prospects for breeding hybrid rice and wheat. Ppt heterosis powerpoint presentation free to view id. Heterosis and hybrid rice breeding sant singh virmani. Hybrid vigor or heterosis is defined as a superior performance of hybrids, for many traits, relative to their parental inbred lines see chapter 8 of this book. Genomic architecture of heterosis for yield traits in rice. Research on heterosis, male sterility systems, outcrossing mechanisms. Heterosis and inheritance of fertilityrestorer genes in rice. Rice is the most important food crop of the developing world and the demand for it is growing.
Provided here is a concise account of hybrid breeding in rice, a newly deployed breeding approach to increase the yield. Ir36 and ir42 yield 45 tha in wet season trials and 78 tha in dry season trials. Hybrid rice yields about 20 more than the best commercial varieties. Genomewide dissection of heterosis for yield traits in. The latter was estimated in comparison to commercial varieties. The estimation of heterosis in hybrid rice is the greatest practical achievements for hybrid rice im. Hybrids have been widely used in crop and tree breeding since ancient times, although the molecular mechanisms underlying. Studies conducted at the international rice research institute irri during 1980 and 1981 have shown up to 73% heterosis, 59% heterobeltiosis and 34% standard heterosis for yield in rice. Therefore, the twoline hybrid rice system has become increasingly important in hybrid rice breeding 5. The book contains a wealth of useful information for practicing hybrid rice breeders, seed producers, researchers, and students of plant breeding. While cumulative small advantages over twolocus combinations.
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