Studies on the Practicability of Indica-japonica Intersubspecific Hybrid Rice Derived from Indica-compatible Japonica Lines

The hybrids were made from the indica compatible japonica lines, which were derived from the high space induced mutants, and different indica male sterile lines including CMS and PTGMS lines. They were surveyed in the performance of seed setting rate and grain plumpness (milled rice recovery of unwinnowed paddy) in different seasons of different years and they were also compared in grain yield with local hybrid rice checks. The results showed that the indica japonica intersubspecific hybrids derived from the indica compatible japonica lines and indica male sterile lines had a high seed setting rate and a good grain plumpness, which were stable in different seasons of different years. Furthermore, some of them had a higher yield, especially a much higher daily yield, than the local hybrid rice check, which indicates that the indica compatible japonica lines have a good applied prospect in hybrid rice breeding and production.