Several second-generation NPT lines outyielded the first-generation NPT
lines and indica check varieties. China’s ‘‘super’’ rice breeding project has developed many F1 hybrid
varieties using a combination of the ideotype approach and intersubspecific heterosis. These hybrid
varieties produced grain yield of 12 t ha1 in on-farmdemonstration fields, 8–15% higher than the hybrid
check varieties. The success of China’s ‘‘super’’ hybrid rice was partially the result of assembling the good
components of IRRI’s NPT