For analysis on heterosis of major agronomic characteristics
among japonica rice, indica rice and weedy rice, twelve
cross combinations were conducted with three reciprocal crosses
between japonica rice and weedy rice (Toyonishiki×WR05-6, Akihikari×WR05-
6, Akihikari×WR04-8) and three reciprocal crosses
between japonica and indica rice (Toyonishiki×Zhongyouzao8,
Akihikari×Qishanzhan, Nipponbare×9311) in Shenyang.