| 摘要: |
| 通过结实率与遗传距离,遗传距离与杂种优势的相关分析发现:利用籼粳分类性状计算出的遗传距离(D_3~2)可以预测杂种后代的结实率,对克服籼粳杂交后代结实率低使优势难以利用的矛盾具有重要意义,遗传距离对后代的杂种优势预测效果因性状而异,多元分析表明:遗传距离与单株产量的杂种优势呈曲线关系;y=-18.173+8.570x-0.692x2在一定范围内,随着遗传距离的增大,单株产量优势有增加的趋势,超过这个范围,杂种优势随遗传距离增大反而有下降的可能。综合结实率、杂种优势和遗传距离(D_3~2)的分析结果表明:选择遗传距离(D_3~2)在4.0～9.0之间,农艺性状较好的材料进行桥梁育种比较适宜。 |
| 关键词: 遗传距离 籼粳杂交育种 亲本选配 |
| DOI： |
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| A STUDY ON GENETIC DISTANCE USING IN CHOICING PARENTS FOR BRIDGE BREEDING OF INDICA-JAPONICA RICE |
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| Abstract: |
| Analysis of heterosis,genetic distance and correlation of traits showed that genetic distance(D_2~3)calculated from classificatory characters could be used to predicate fertilty of hybrid progeny.It is important to find a way out of the semi-fertility of progeny between indica and japonica rice crosses. The effectiveness of prediction of heterosis by genetic distance between the parents was different with various characters used in estima- tion.The result of multivariate analysis indicated that the relation... |
| Key words: genetic distance indca-japonica cross breeding parent selection |
