Breeding of Indica Two-Line Hybrid Rice

The effectiveness of breeding Indica photoperiod-sensitive genic male-sterile (PGMS) rice has been studied since 1982. Eight Indica male sterile lines have been bred from the progenies of Indica/Japonica or its reciprocals; their fertility response to photoperiod and temperature and fertility alteration were investigated. Five promising two-line inter-varietal hybrid rices of W6154S and W6184S have been developed through extensive test-crossing. Discussions made on the evaluation and utilization of Indica PGMS or TGMS lines in current two-line hybrid rice breeding.