Studies on the mid-parent heterosis of yield components factors in three-line indica hybrid rice

AbstactThe mid-parent heterosis of yield Components factors, the mid-parent heterosis relationships among characters, the correlation between the mid-parent and the mid-parent heterosis , between the mid-parent heterosis and yield Components factors were analysed in a five CMS lines and six restore lines that had been wide unitized or newly developed in guangdong set of cross. The results showed that it was important to increase grains per panicle and decrease the seed-setting rate in parent, and to increase the mid-parent heterosis of the seed-setting rate, 1 000-grain weight and yield per plant in F1; the series of Guanghui 998 and Tian A were high mid-parent heterosis of the seed-setting rate, 1 000-grain weight and yield per plant.