| Abstract: | Based on 13 genetic male sterile lines of paddy rice newly-developed in academies of agricultural sciences of China, study was undertaken of the determination of ecological conditions for their fertility conversion in terms of the leveling of daylength and temperature and a fertility quantifying model in the context of observed bagged seedlings (in percentage) through self mating by pollen inside, daylength and temperature from the experiments with sowing by stage in three different latitude zones, i. e., at Sanya of Hainan Province, Guiyang of Guizhou and Wuhan of Hubei. Results show that five sterile lines are temperature-sensitive with the fertility conversion temperature below 24 ℃, two of the daylength-sensitive sterile lines have conversion daylength of ＞ 12. 4 h, suggesting their almost full sterility, and one of the photo- and temperature-sensitive lines needs shorter daylength either at high or at low temperature for fertility conversion. These eight sterile lines are of productive significance. |
