24份水稻细胞质雄性不育系异交性能研究

对生产上广泛应用的24份水稻细胞质雄性不育系的异交性能的分析表明:在7个开花性状中,只有开花历时和开花时间与异交结实率呈负相关,而柱头双边外露率、包颈粒率、柱头单边外露率、张颖角度、开花历期都与异交结实率呈正相关。通径分析显示,各个开花性状与异交结实率的直接通径系数由大到小依次为包颈粒率、柱头单边外露率、张颖角度、柱头双边外露率、开花历期、开花时间、开花历时;其中包颈粒率、柱头单边外露率、张颖角度、柱头双边外露率对异交结实率的直接作用都远大于间接作用,这表明这几个性状与异交结实率有很大的相关性;而开花历时的直接通径系数为负值。

Study on Outcrossing Abilities of 24 Cytoplasmic Male Sterile Lines of Rice

The outcrossing habit of rice male sterile line is closely related to the seed production yield.The outcrossing abilities of 24 cytoplasmic male sterile lines of rice which were widely used in the production were studied.The results showed that: among 7 flowering characters,only the spikelet opening time and flowering time had negative correlation with the outcrossing setting rate,yet the glume-opening dual exserted stigma rate,grain-wrapped rate,glume-opening single exserted stigma rate,opening angle of the spikelet and blooming duration had positive correlation with the outcrossing setting rate.The path analysis indicated that the direct path coefficient between various characters and the outcrossing setting rate had the following order: grain-wrapped rate> glume-opening single exserted stigma rate> opening angle of the spikelet> glume-opening dual exserted stigma rate> blooming duration> flowering time> spikelet opening time.The direct functions of grain-wrapped rate,glume-opening single exserted stigma rate,opening angle of the spikelet and glume-opening dual exserted stigma rate on the outcrossing setting rate were obviously greater than their indirect functions,showing these four traits had very close correlation with the outcrossing setting rate.However,the direct path coefficient between the spikelet opening time and the outcrossing setting rate was negative.