Fertility response to photoperiod and temperature in 76 dual purpose genic male sterile lines(Oryza sativa L.) was studied under 9 controlled combinations of photoperiods with temperatures. According to the variance analysis on seed setting data, 96% of the total male sterile lines studied can be grouped into four types as follows: (1)Photoperiod sensitive genic male sterility (PGMS), characterized by significant (P<0.05) photoperiod(P) effect and P×T interaction and non significant (P>0.05) temperature (T) effect, (2)Thermosensitive genic male sterility (TGMS), by significant T effect, non significant P effect, significant or non significant P×T interaction, and (3) Photo thermosensitive genic male sterility (P TGMS), by only significant P×T interaction. Among japonica lines studied, PGMS, TGMS and P TGMS account for 34.8%, 13.0% and 47.8%, respectively. Among indica lines, TGMS and P TGMS account for 73.6% and 22.6%, respectively and no PGMS was detected. The results indicate that the dual purpose genic male sterile lines are diversified on fertility response to photoperiod and temperature. Selection of fertility response to photoperiod and temperature available to produce two line system hybrid rice is discussed.
Scientia Agricultura Sinica
Dual purpose genic male sterile line
Response to photoperiod and temperature
Oryza sativa L.