Study On Inheritance And Correlation Of Rice Quality Characters & Agronomic Characters Of Middle Indica Hybrid Rice

The rice quality characters and agronomic characters of 33 middle hybrid combinations and their parents,cultivated at Xuancheng,Hefei,Huaiyuan in 2001,were studied with the analysis of variance,heterosis,genetic correlation,combining ability and principal components etc. The results were as follows.1. It was indicated,through analysis on combining ability,that the sterile lines Zhong9A was the most available in rice quality breeding;the parents such as Jin23A,Minghui63,Jianghui151 were more available in rice quality breeding;The parents such as 057,Zhenshan97A,LongtepuA were less available in rice quality breeding.2. The partial correlation of rice quality characters indicated that the positive correlation among milling characters was significant at 1% level;the positive correlation between head milled rice recovery (HMR) and milled rice recovery (MRR) or brown rice recovery (BRR) was significant at 1% level,the partial correlation coefficients were 0.865**,0.478**,respectively.The rice length (L) and rice width (W) constrained each other,the correlation between L and other rice quality characters was almost reverse to that of W and other rice quality characters. That the L increased would be good for rice shape and chalkiness,but be bad for the milling characters and alkali-spreading value (ASV).The negative correlation between chalky rice rate (CR) and BRR or MRR was significant at 1% level;the negative correlation between chalky rice rate (CR) and L or L/W was significant at 1% level;the positive correlation between CR and W was significant at 5% level. The positive correlation between chalky area (CA) and W was significant at 1% level;the negative correlation between CA and L/W was significant at 1% level.The partial correlation among the cooking- and tasting quality was significant at 5% or 1% level.The correlation coefficients between the agronomic characters and the rice quality characters were conducted also. The positive correlation between grain yield (GY) and MRR or HMR was significant at 1% level,but the negative correlation between GY and other rice quality characters were not significant at 5% level. It indicated that GY and the rice quality characters didn't constrain each other,it was possible to breed the high-quality and high-GY hybrid middle indica combinations or varieties.3. The narrow heredity capacity of the principal rice quality characters was as follows:L/W>AOASV>CD>HMR>GC;The narrow heredity capacity of the principal agronomic characters was as follows:PH>KGW>FS>PP>GY.4. Judged by rice quality and GY,the combinations Jin23A/Minghui63,K17A/ Fuhui838,K17A/Minghui63,399S/Yangdao6,X07S/Yangdao6,Pei'ai64S/ Yangdao6 were high-quality and high-GY. They were more potential in cultivation.