STUDY ON SELECTION AND EVALUATION OF JAPONICA RICE MUTANT E203 WITH SUPERIOR GRAIN QUALITY

Dry seeds of F 0 come from the crossing of japonical rice Hainan 68×Jia 52 were treated with 100Gy of 60 Co γ\|rays,and the F\-1 were treated with 200Gy of 60 Co γ\|rays.A japonical rice mutant with superior grain quality was selected in the following generations,and named as E203.It was demonstrated that the mutant had excellent milling and cooking quality as compared with its original parents and japonica rice variety Xiushui 11 with superior grain quality in Zhejiang province,better milling quality and almost the same cooking quality as compared with koshihikari—a famous japonica rice variety with superior quality introduced from Japan.It also had higher yield and stronger blast resistant ability.The above results show that it is possible and effective to improve grain qualtiy of japonica rice by means of irradiation.E203 with the improved comprehensive agronomic characters might be directly applied to the rice production,and might be used as a good gene resource of rice for improving grain quality in japonica rice breeding.