| 浅析两系“龙凤胎”—x186 |
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| 引用本文： | 南钟浩.浅析两系“龙凤胎”—x186[J].北方水稻,2012,42(6):12-14,22. |
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| 作者姓名： | 南钟浩 |
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| 作者单位： | 吉林省农业科学院水稻研究所,长春,130033 |
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| 摘 要： | 2003年在01-124稻田里发现不育株36-20S后,先后两年南北两地高低温条件下未得到不育株种子,因而采用"逐代展开法"保留其不育基因。2011年9月,发现其杂交后代不育株率高达42%。利用冬季南滨变温幅度大的条件,观察x186不育株稻茬、可育株单株和同代原种不育株的育性。结果表明x186G1S、x186HS是温敏不育系,起点温度为21～22℃,x186G2S、x186-1S、x186-2S是反温敏不育系,临界温度为25～26℃。x186同时含有温敏型不育基因和反温敏不育基因,因而称作"龙凤胎"。同时选育育性类型截然不同的两系不育系,既拓宽时空,又便于制、繁种。反温敏不育系的选育及应用,将为两系法杂交粳稻育种的发展和杂交粳稻的推广应用带来变革,x186便是北方早粳稻区两系法育种的拐点。
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| 关 键 词： | 龙凤胎 温敏不育系 反温敏不育系 逐代展开法 临界温度 起点温度 |
The Elementary Analysis of Two Lines "twins" - X186 |
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| NAN Zhong-hao.The Elementary Analysis of Two Lines "twins" - X186[J].Reclaiming and Rice Cultivation,2012,42(6):12-14,22. |
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| Authors: | NAN Zhong-hao |
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| Institution: | NAN Zhong-hao(Rice Research Institute,Jilin Academy of Agricultural Sciences,Changchun Jilin 30033,China) |
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| Abstract: | The sterile lines 36-20S was found in 01-124 paddy fields in 2003 which had no sterile seeds in a two years test under the north-south and low-high temperature condition.In order to retain its sterile gene,the "generational expansion method" was used.The hybrid sterility rate was as high as 42% in Sep.2011.By using the broad temperature variation in the winter of Nanbin,the rice stubble of sterile rice line X186,fertile individuals and the fertility of the original sterile individuals of the same generation were observed.The results showed that X186G1S and x186HS were temperature sensitive.The starting temperature was 21-22 ℃.X186G2S,x186-1S and X186-2S were antitemperature sensitive sterile line.The critical temperature was 25~26℃.X186 was named as "twins" since it contains both temperature sensitive sterile gene and anti-temperature sensitive sterile gene.The development of the anti temperature sensitive line X186-1S eliminated the bottleneck of the two-line hybrid rice breeding in the northeast early Japonica rice district. |
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| Keywords: | Twins Temperature sensitive sterile line Anti-temperature sensitive sterile line Generation to generation expansion method Critical temperature The starting temperature |
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