Studies on Grain Quality of Three line Indica Hybrid Rice

The grain quality of the existing three line indica hybrid rice was studied with widely used 6 A lines, 9 R lines and their 54 hybrids as the materials. The results showed that most of the grain quality characters of the tested hybrids were good: in 5 (brown rice, milled rice, kernel length, gelatinization temperature and amylose content) out of the tested 11 characters all hybrids were up to the 2nd class standard of fine quality rice issued by the Chinese Ministry of Agriculture, in 2 characters (L/B ratio and protein content) over 77.8% of hybrids were up to the 2nd class standards, but few hybrids were up to standard in chalky rice rate, chalky area, head rice recovery and gel. consistency, which is the greatest problem in grain quality of indica hybrid rice. It is suggested that in quality hybrid rice breeding, the weight for A lines should be laid on decreasing chalkiness and increasing gel. consistency; and for R lines the most important objectives should be decreasing chalky rice rate and increasing head rice recovery, meanwhile, improving protein content should also be given consideration.