Studies on response to photoperiod and temperature of the photoperiod-sensitive genic male sterile rice (PGMSR). I. Observation of fertility in PGMSRs under natural conditions at Hangzhou (30° 05′ N).

The change of fertility in PGMSRs, including 6 indica and 5 japonica rices, was observed under natural conditions at Hangzhou (30°05′N, 119°56′E, 6.5m). It was shown that the response of PGMSR to photoperiod and temperature was different with their genetic background and that the fertility transfer date varied in the tested PGMSRs.Temperature played an important role in fertility transfer of PGMSRs, as to indica, its role seems much more important or dominant.