[Analysis of gene loci and epistasis for drought tolerance in seedling stage of rice (Oryza sativa L.)].

Drought tolerance of rice is important because a considerable proportion of the world rice area is not irrigated and is prone to water deficit. In this study, an indica variety, Zhai Ye Qing 8 (ZYQ8), and a japonica variety, Jing Xi 17 (JX17), and their double haploid (DH) population were used for genetic study of drought tolerance. Water supply was stopped in seedling period for 15 days and then drought tolerance of the DH population and their parents were investigated.

[QTL analysis of sheath blight resistance in rice (Oryza sativa L.)].

In this study, an indica variety Zhai Ye Qing 8 (ZYQ8) and a japonica variety Jing Xi 17(JX17) and their double haploid (DH) population were used. Sheath blight resistance of the DH population and their parents was investigated using a syringe inoculation method. Quantitative trait loci (QTL) analysis was undertaken based on a constructed molecular linkage map of this population in Hangzhou and Hainandao respectively.