北方粳型两系杂交稻杂种优势及其与亲本的关系

Heterosis and Relationship between Offsprings and Parents on Northern Japonica Two-line Hybrid Rice

选用4个光温敏核不育系与4个恢复系,按不完全双列杂交试验设计,通过对杂交组合各农艺性状与双亲关系的研究发现,在株高和穗节伸出长度这两个性状上,所有杂交组合均超过中亲值;16个杂交组合在一次枝梗粒数、二次枝梗粒数和单株有效穗数这3个性状上与恢复系呈极显著正相关。

Selected 4 Japonica photoperiod/ thermo-sensitive genic male sterile lines and 4 restorer lines,using the experiment of incomplete diallel cross（NCⅡ） to research the relationship between offsprings and parents on agronomic traits,the results indicated that all crosses exceed midparent on plant height and panicle length,there was a significant positive correlation among grains number at primary branch,grains number at secondary branch,effective panicles per acre and restorer from 16 crosses.