一种新型玉米温敏核雄性不育系的发现、鉴定及遗传分析

 【目的】阐明玉米新型温敏核雄性不育系琼68ms的育性转换机制和遗传机理。【方法】笔者对新发现的温敏核雄性不育系琼68ms进行了生态学、形态学和遗传学分析。【结果】琼68ms是一种花药败育型的温敏核雄性不育系，表现为高温不育、低温可育，育性转换的敏感时期是雄穗发育的小穗分化期，临界温度为30～33℃；其不育性由一对隐性核基因控制。【结论】温敏核雄性不育系琼68ms的育性主要受温度控制,在高温条件下不育性稳定，可以作为“两系”制种的基础材料，在生产具有一定的应用前景。

Developmant, Identification and Genetic Analysis of a New Thermo-Sensitive Genic Male Sterile Line in Maize

The discovery and identification of new thermo-sensitive male genic sterile line is important to the seed production with “two line” system in maize. A new thermo-sensitive male genic sterile line Qiong-68ms was discovered, and its ecological mechanism, cytological characters as well as genetics were analyzed in this report. The results showed that the TGMS line Qiong68ms expressed complete sterility when the daily maximum temperature was more than 33℃ during spikelet phase of head differentiation, and exhibited fertility when the daily maximum temperature was lower than 30℃ during that phase. Its sterility was governed by a recessive genic gene.