Therefore, the twoline hybrid rice system has become increasingly important in hybrid rice breeding 5. Rice is the most important food crop of the developing world and the demand for it is growing. The latter was estimated in comparison to commercial varieties. 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. Genomewide dissection of heterosis for yield traits in. Hybrid rice yields about 20 more than the best commercial varieties. Insights into the genomic architecture of heterosis for grain yield in rice are presented, and further mapping of grain yield loci resolves candidate genes that could be useful for breeding. Ppt heterosis powerpoint presentation free to view. Ppt heterosis powerpoint presentation free to view id. Current status and future prospects for breeding hybrid rice and wheat. Genomic architecture of heterosis for yield traits in rice. Heterosis and inheritance of fertilityrestorer genes in rice.
Although heterosis, or hybrid vigor, has been successfully used in hybrid rice production. Hybrid rice cultivation area is steadily expanding around the world, especially in southern asia. Provided here is a concise account of hybrid breeding in rice, a newly deployed breeding approach to increase the yield. Heterosis and hybrid rice breeding sant singh virmani. Hybrids have been widely used in crop and tree breeding since ancient times, although the molecular mechanisms underlying. Research on heterosis, male sterility systems, outcrossing mechanisms. While cumulative small advantages over twolocus combinations.
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