关键词: 常规粳稻, 杂交粳稻, 苗期, 根系, 产量

Abstract:

The relationship between root traits and yield of conventional japonica rice and hybrid japonica rice at seedling stage were analyzed in this study, using five conventional japonica rice and four hybrid japonica rice as materials. It is hoped that the root characteristics of two types of japonica rice at seedling stage could be used to answer the non-prominent heterosis of japonica hybrid rice in the northern China and to provide some theoretical support for breeding. The results showed that the average root diameter of hybrid japonica rice was about 19% higher than that of conventional japonica rice at seedling stage, while the root length, the area of projection, the surface area, the root volume and the number of root tips were less than those of conventional japonica rice. Northern hybrid japonica rice seedling root system is “short fat” type. Correlation analysis showed that root diameter and root volume at seedling stage were positively correlated with yield, therefore, the varieties with stronger root and larger root volume at seedling stage had more yield.

Key words: conventional japonica rice, hybrid japonica rice, seedling stage, root, yield