Exploitation of genetic variation caused by space treatment in rice

Seeds of early indica rice varieties 6188, D6049, of late indiea rice varieties Minghui 63, Xiangge, Waiqi, 70321, and late japonica rice variety Beik 15 were carried by the retrieved satellite "921006" in order to investigate the comprehensive effects of the space factors. Treated seeds and untreated seeds (CK) were grown in the field. The results showed that although compared with the CK (which was very uniform) small differences on population uniformity, plant height, growth duration and seed setting rate were observed, no segregation was found in SP_1. Strong segregation occurred in SP_2 and SP_3 generations. Significant difference on the grain yield of Single plant was observed between SP_2 and CK, while the yield between