Analysis on Combining Ability of Major Quality Characters in Three-line Indica Hybrid Rice of South China

Twelve widely utilized indica parents of north China,including 6 sterile lines and 6 restorer lines,were chose to analyze the combining ability of 12 quality characters by the way of NCⅡ mating design.The results showed that both general combining ability(GCA) and specific combining ability(SCA) of all the quality characters determined were significant at 5% or 1% level.It meant that all characters were both affected by the additive effects and non-additive effects,and the former were more important than the latter.The GCA and SCA effect were independent each other,which suggests that it is essential to make widely testcrosses in the selection of hybrid combinations.Based on the GCA effect and SCA variances of the parents,sterile lines Shuangqing A,Wanjin A,Bo A and Ⅱ-32 A and restorer lines Guanghui 998,gui 99 and HR 15 were recommendable at the major quality characters.