Abstract:

The new type of male sterile SA line was demonstrated to have more complete and stable male sterility and have specific multiplication character from other type of male sterile line. In order to offer help for its application, the multiplication trials of 2310SA was carried out during two successive spring season in hainan. The results indicated that it was feasible to multiply the seeds of 2310SA japonica line in hainan. The multiplication yields of existing 2310SA were 2.23 t/hm2 with outcrossing rate of 40% under desirable conditions. Some identical multiplication characteristics were observed such as the days from the sowing to heading initiation, characteristics of heading and flowering between 2310SA and its maintainer line, 2310S. Spraying a small number of GA3, lower than 75 g per hectare, the plant height of 2310SA increased significantly. There was no significant effect of different dosages of GA3, 0 g, 75 g, 150 g, 225 g, 300 g, 375 g per hectare,on outcrossing rate of 2310SA. Base on the experimental results，the multiplication technique and suited conditions of 2310SA for the high yield were further discussed.