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作者	单位
周美兰，扬庚武，孔得群，宋雪薇，朱潇，贺晓敏，茹振刚	（1.湖南农业大学农学院，湖南长沙 410128； 2.河南科技学院小麦中心,河南新乡453003）

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中文摘要:

为了揭示小麦温敏不育系BNS366的育性转换规律，为不育系的转育及杂种优势利用提供依据，于2011-2013年度连续2年采用大田分期播种试验分析了BNS366、BNS、矮抗58和扬麦13的育性特点。结果表明，随着播种期的推迟，BNS366表现出规律性育性转换特征。9月23日至10月17日播种，花粉败育率为99.77%~100%，自交不育度为99.21%~99.81%，每穗自交实粒数为0.10~0.51。10月25日播种，花粉败育率为91.78%~98.89%，自交不育度为92.86%~94.96%，每穗自交结实粒数为3.20~4.37，12月4日播种可育。BNS366具有两个育性转换的临界期，10月25日播期为不育变为高度不育的育性转换临界期，12月4日播期为半不育转换为可育的育性转换临界期，不育期花粉以典型败育为主。BNS366可以作为小麦杂种优势利用新的不育系。

英文摘要:

In order to explore the fertility alteration rule of thermo-sensitive male sterile wheat line BNS366, and provide a basis for its utilization of wheat heterosis, a field experiment was conducted to investigate the pollen abortion rate, fertility index and seed setting characters by means of interval sowing method with two-line male sterile line BNS366 as the test material and BNS, Aikang 58, and Yangmai 13 as the controls in Changsha, Hunan province from 2011 to 2013. The results showed that the fertility alteration of BNS366 appeared regular characteristics with the sowing date delaying. When BNS366 was sowed during September 23rd to October 17th, the pollen abortion rate ranged from 99.77% to 100%, the sterile degree was from 99.81% to 99.21% and selfing grain numbers per ear was from 0.10 to 0.51. While sowed on October 25th, the pollen abortion rate ranged from 91.78%-98.89%, the sterile degree was from 92.86% to 94.96% and the selfing grain numbers per ear was from 3.20 to 4.37. When sowed on December 4th, it was completely fertile. BNS366 had two critical sowing dates of fertility alteration:one was October 25th on which it transformed from sterile to highly-sterile and the other was December 4 on which it transformed from partly fertile to completely fertile. The pollen mainly shows typical abortion at complete sterility stage. BNS366 showed fertility alteration and when it was sown in Autumn in Changsha, it could be used for seed production while when it was sown in Winter in Changsha, this male-sterile line could reproduce seeds. BNS366 could be used as a new male sterile wheat line for hybrid breeding.

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