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Heterosis and Correlation Analysis for Three line Inter subspecific Hybrid Rice

Chen Caihong Su Xuejun Qin Xiyin (Hybrid Rice Research Center,Guangxi Academy of Agricultural Sciences,Nanning 530007 China)  
All the inter-subspecific combinations from indica CMS line Shan A crossed with 15 indica-japonica intermediate restorer lines showed heterosis in spikelets per panicle but negative heterosis in 1000-grain weight,while their productive panicles per plant and seed- setting rate were almost the same as the check.The yield of hybrid showed significant partial correlation with spickelets per panicle, productive panicle per plant,seed setting rate and 1000-grain weight,but significant negative partial correlation were found between the four characters.We also found that there were no relations between indica/japonica property of the intermediate male parents and the major agronomic characters of their progenies.For promoting the heterosis of inter-subspecific hybrids,it is essential to develop intermediate restorer lines with ideal plant type,high 1000-grain weight and rational panicle-spikelet structure.
【CateGory Index】: S511.1
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