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Analysis on Combining Ability of Main Characters in Two-line Japonica Hybrid Rice

ZHU Zhen,ZHAO Ling,ZONG Shou-yu,ZHANG Ya-dong,WANG Cai-lin(Institute of Food Crops,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China)  
Four japonica PGMS lines and 8 restoring lines of two-line japonica hybrid rice were selected as parents to analyze the combining ability of 8 characters by p×q incomplete diallele cross(NCⅡ)design.The results showed that both general combining ability(GCA) and specific combining ability(SCA) of all the characters were significant at 1% level.The role of GCA was more important than that of SCA for all characters.The role of SCA for filled grains and grain yield per plant was greater than that for other characters,and the role of GCA for restoring lines was greater than that for PGMS lines.PGMS line "S_(23)" and restoring line "Xuan 2" and "C418",showed greater GCA and SCA variance for main characters.
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