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用 5个不同耐冷级别品种按 1 / 2 p(p- 1 )配制 1 5个组合及其亲本在籼稻区 (F1 )、籼粳交错区 (F2 )和温凉粳稻区(F1 、F2 、F3 )进行云南稻种颖壳、花药大小和结实率的遗传变异研究 ,结果表明 :(1 )耐冷稻种在冷害条件下颖壳变窄、花药大小相对稳定、结实率较高 ,花药长缩短与结实率呈负相关或极显著负相关 ;极弱耐冷品种十和田则呈极显著正相关 (0 .92 4**)。(2 )极强耐冷的昆明小白谷、丽粳 2号耐冷性状的 GCA较高 ,用它们作耐冷基因供体、十和田作轮回亲本已获得一批耐冷性近等基因系。 (3)不同世代同一稻区和同世代不同稻区的耐冷性状及 SCA在不同稻区存在明显差异。 (4)籼粳杂种后代在温凉粳稻区粳型性状变异同时伴随着耐冷基因的累积 ;而在籼粳交错区和籼稻区则有利于籼型性状的遗传进化
Fifteen combinations and their parents were prepared from 1/2 p (p-1) with 5 different cold tolerance cultivars in indica rice (F1), indica-japonica crosses (F2) and warm and cool Japonica rice The results showed that: (1) The cold-tolerant rice cultivars with cold tolerance had narrower glume shells, relatively stable anther size, higher seed setting rate, shorter anther length and Seed setting rate was negative or very significant negative correlation; extremely weak and cold tolerant rice was a very significant positive correlation (0.92 4 **). (2) The GCA of cold tolerance trait of Lijing 2, a strong and cold tolerant Kunming Xiaobai Valley, was high, and they were used as cold tolerance gene donors. Taxanes of Towada had near-isogenic lines. (3) Cold tolerance traits and SCA in different rice regions of the same generation and in the same generation in different generations were significantly different in different rice regions. (4) The indica / japonica hybrid progeny had the variation of japonica traits in cold temperate japonica rice at the same time with the accumulation of cold tolerance genes, while the indica / japonica crosses and indica rice were beneficial to the genetic evolution of indica traits