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Studies on the Characteristics of Fertility Alteration in Two New Indica Rice of Photo-Thermo Sensitive Genic Male Sterile Lines
Author(s): 
Pages: 157-161
Year: Issue:  12
Journal: CHINESE AGRICULTURAL SCIENCE BULLETIN

Keyword:  籼稻光温敏核不育系温度敏感期临界温度;
Abstract: 为了研究新育成的水稻光温敏雄性不育系H61S、H69S的育性转换特性,于2005-2006年在湛江进行了分期播种试验和人工控制光温试验,结果表明:(1)温度是引起两个光温敏不育系育性转换的最主要的原因,光照时数对不育系育性影响不显著.(2)H61S、H69S的育性温度敏感期分别为抽穗前19~10d和20~10d,最敏感期均为抽穗前17~13d,与对照培矮64相似.(3)当不育系由不育转为可育,可育花粉率达1%时,H61S、H69S和对照培矮64S的育性转换临界温度分别为24.2℃、25.3℃、26.1℃.(4)两个不育系在湛江自然播种条件下都有较长的稳定不育期和较高的自交结实率,育性转换期均比对照培矮64S短,可以安全制种,也可繁殖,但适宜繁殖的抽穗期范围窄.
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