水稻数量性状的相关和单株产量的选择指数

CORRELATION BETWEEN QUANTITATVE TRAITS AND SELECTION INDICE IN RICE

摘要:

本文研究了水稻10种数量性状间的相关性,遗传进度和选择指数等遗传参数。结果表明,相关和通径分析以每穗粒数,每株穗数、株高和穗长对单株产量贡献较大,故选择时应予以重视。在单株粒重的选择指数中每穗粒数是重要的性状,每株穗数是相关选择的关键性状,选择大穗同时兼顾株高对单株产量也有一定的提高效果,应作为限制性选择指标。在水稻育种中应用选择指数方法进行综合选择比对单株产量单一性状直接选择效率高20.42%,应用前景广泛。

Abstract:

Correlation genetic advance and selection index were investigated for 10 quantitativecharacters in rice. Results showed that number of seeds/spike, number of spikes/plant, plant height and spike length played an important role in the formation of grain yield/plant, on the basis of analysis of correlation and path coefficients. In various indice for selecting seed weight/plant, number of seeds/spike is an important trait for direct selection, and number of spikes/plant the key-trait for correlation selection. Selection for large spikewith emphasis on plant height can improve grain yield/plant to certain extent, and hencethe two should be used as limitting selection indicators. In practical rice breeding programs, multi-trait index selection for plant yield improves selection efficiency by 20.42%, compared to single-trait selection