摘要
以十和田×（十和田^5／昆明小白谷BC4F6）配制的杂种BC5F4系统群为材料，在昆明自然低温平均18％冷害条件下，进行孕穗期边际耐冷性研究。结果表明：（1）边际效应主要影响有效穗、秕粒数，其边际效应指数值分别为1．6564和1．4034；而对株高、剑叶长、剑叶宽、和结实率影响较小，边际效应指数为0．9708～1．2371；穗颈长、穗下节长、1～2节长、穗长、实粒数、总粒数（2）内部与边际群体一些性状间的相关性存在一定的差异，即内部群体不论是耐冷性状株高、穗长，还是耐冷指标性状穗颈长、穗下节长、1～2节长、实粒数、总粒数和结实率间均达极显著相关，且相关性大于边际群体；（3）内部与边际群体株高、穗颈长、穗下节长、1～2节长、穗长、实粒数、总粒数和结实率分布的总趋势是一致的，即均呈数量性状的分布特征；不同之处在于内部群体主峰值区间小于边际群体，尤其耐冷指标性状差异较大。
Under natural low temperature （18℃） cold damage circumstances in Kunming , the marginal effect on cold tolerance at the booting stage of BC5F4 generation of hybrids from near-isogenic line （BC4F6） of Donor parent Kunmingxiaobaigu and Towada （indica rice） was analyzed.The results showed that ： （1） The effective tillering and bligthed grains were affected by the marginal effect, its marginal effect index was 1.6564 and 1.4034; plant height, flag leaf length, flag leaf width, peduncle length, node length under spike, first to second node length, ear length, full grains, total grains and seed setting rate were low effect, their indexs were between 0.9708-1.2371 ; （2） There is the clear diffrence on correlation of some traits between interior and outer populations, which shows each property in interior populations outgos outer, with cold tolerant traits including plant height , ear length or cold tolerant index traits including peduncle length, node length under spike, first to second node length, full grains, total grains and seed setting rate.Their correlation were significant at 1% level. （3） The distribution of plant height, peduncle length, node length under spike, first to second node length,＇ ear length, full grains, total grains, and seed setting rate are consistent, which show the character of quantitative traits, but there are some differences on major mean in differerent populations, especially cold tolerant index traits.
出处
《西南农业学报》
CSCD
2006年第B09期34-39,共6页
Southwest China Journal of Agricultural Sciences
基金
云南省自然科学基金（2004C0010Z）、云南省人才培引项目（2005PY01-14）和国家自然科学基金（30160043）资助.
关键词
近等基因系
孕穗期耐冷性
边际效应
near-isogenie line
cold tolerance at the booting stage
marginal effect
