On Appearance and Correlation of Rice Quality Characters in Hybrids by Two-Line Method

In this study,147 combinations are obtained by crossing 8 photo-thermo-sterilities with 30 restoring lines.The study of rice quality characters of all hybrid combinations F1 is as follows:The rate of high quality of two-line system hybrid rice is low,according to the 3rd class and 2nd class standard of high quality rice,the percentage of high quality combination is only 10.2% and 0.68%,no combination is of high quality by 1st class standard of high quality rice.The rate of high quality of chalky score and chalkiness is low,according to the 3rd class,2nd class and 1st standard of high quality rice,the percentage of high quality combination is 21.09% and 18.37%,12.24% and 12.24%,4.08% and 4.76% respectively.With correlation among quality characters significant,the brown rice is very significantly positively correlated with rice percentage,chalkiness and chalk score;the rice percentage is very significantly negatively correlated with gel consistency;the chalkiness is very significantly positively correlated with amylose content and 1000-grain weight;the chalk score is very significantly negatively correlated with length/width;the amylose content gelanatinization is significantly positively correlated with 1000-grain weight.