籼粳稻区重组近交系孕穗期耐冷性研究

以昆明小白谷和大理早籼杂交培育的孕穗期耐冷性重组近交系(RIL)为材料进行籼粳稻区水稻耐冷性研究。结果表明:(1)籼粳稻区株高、穗下节长、穗长和总粒数均呈数量性状的分布特征.(2)籼粳稻区一些性状间的相关性存在一定的差异,冷凉粳稻区株高与结实率等性状密切关性;相反高温粳稻区穗颈长与穗部4个性状达极显著或显著相关。(3)遗传研究表明对低温和高温均敏感的穗颈长和结实率受主效基因控制,多数弱耐冷单株的耐热性相对较强。

Cold Tolerance at the Booting Stage of Recombinant Inbred Lines at Indica and Japonica Rice Cropping Regions

Cold tolerance at the booting stage of recombinant inbred lines (RIL) were analyzed undert indica and japonica rice cropping regions by using Kunmingxiaobaigu and Dalizaoxian, Yunnan rice landrace, and their F7 and F8 generation. The results showed that (1) plant height, internode length No.1, panicle length and pikelets per panicle show the characteristic of quantitative traits. (2) There is the clear difference on correlation of some traits between ndica and japonica rice regions, which shows plant height and seed setting rate etc. traits at cold-cool japonica rice cropping regions. On the contrary, panicle exsertion and four trait of panicle of RIL were significantly correlated at 5% or 1% level of at high temperature indica region.(3)Genetic analysis showed that there were major gene affecting the panicle exsertion and seed setting rate of low or high temperature sensitive, a lot of weaker plants with cold tolerance have relatively stronger heat tolerance.