解决低温敏两系核不育系繁殖问题的策略与实践

为了解决低温敏两系核不育系繁殖中存在的问题，根据云南保山市48年（1953-2000年）的气象资料统计和云南保山市不同年份、不同基地不同不育系繁殖试验。结果表明，云南保山市不育起点温度为22℃的两用核不育系育性敏感期和抽穗杨花期同时满足的概率为83.34%，比海南三亚市高出48.34%；不同不育系在云南保山市繁殖时育性转换顺利，特别是C815S在海拔1560 m的基地大面积繁殖，产量达9133.5 kg/hm2，提出了解决低温敏两系核不育系繁殖问题的策略是建立云南保山市两用核不育系繁殖基地。

The Strategy and Practice of Solving the Breeding Problems of the Low Temperature Sensitive Two-line Nuclear Male Sterile

To solve the breeding problems of the low-temperature sensitive two-line nuclear male sterile, 48 years meteorological statistics of Baoshan City, Yunnan Province were analyzed, and different CMS breeding experiment in different year and different base of Baoshan City, Yunnan Province was studied. The results showed that： the probability of meeting the fertility sensitive security stage and flowering security period of the two-line nuclear male sterile with the sterile starting temperature of 22℃ was 83.34%, which was 48.34% higher than that of Sanya City, Hainan Province. Different CMS fertility transformed smoothly in Baoshan City breeding, especially C815S, which was large-scale bred at an altitude of 1560 meters bases, the yield reached 9133.5 kg/hm 2 , which created the highest record of breeding of the rice CMS lines. Therefore, to build dual-using nuclear sterile line breeding base in Baoshan City was the strategies of solving the breeding problems of the low-temperature sensitive two-line nuclear male sterile.