Analysis on Combining Ability and Heritability in Milling Quality and Apparent Quality Characters of Dian-type Japonica Hybrid Rice

The combining ability for 8 milling quality and apparent quality characters was studies with 9 male sterile lines and 8 restorer lines of Dian-type Japonica Hybrid Rice widely used by the way of p×q incomplete diallel cross(NCⅡ) design.Both general combining ability(GCA) and the specific combining ability(SCA) of all characteristics were significant or highly significant.The milled rice ratio,the head milled rice ratio,the milled rice width,the chalky grain ratio and the chalkiness degree were controlled by both additive and non-additive effect.And the brown rice ratio,the milled rice length and ratio of length to width of milled rice were mainly controlled by the additive effect.8 quality characters were influenced more greatly by sterile lines than by restorer lines.To breeding good combinations for the milling and apparent quality traits of rice,the sterile line choice was very important.The narrow heritability in 8 quality characters ordered from high to low as ratio of length to width of milled rice,the milled rice length,the chalkiness degree,the chalky grain ratio,the milled rice width,the brown rice ratio,the milled rice ratio,the head milled rice ratio.The narrow heritability ranged from 74.93 % and 30.48 %.Based on the GCA and SCA of the parents,sterile lines Dianyu 1A,Dianjingyou 5-1A,Hexi 22-2A,Yuxixianggu A,and restorer lines Nan 34,DiankunXiang 1,Za 8 and Nan 34 xuan were recommendable.