Abstract: Three upland rice varieties (Handao 277, Brazil upland rice, Handao 502) and two lowland rice varieties (Chunjiang 016, Zhengdao 6 ) were crossed to study the inheritance of leaf relative water content under water stress. The relative water content of rice was quantitative traits and controlled by polygene, the broad-sense heritability and narrow-sense herit ability of leaf relative water content were both high. The leaf relative water content of rice was mainly controlled by additive genetic effects, and also influenced by dominant genetic effects. The improved methods for drought tolerance of rice and the utilization of upland rice germplasm in the paddy-upland hybrid rice were also discussed.

Key words: lowland rice, upland rice, drought tolerance, leaf r elative water content, inheritance

摘要： 以3个水陆稻组合(旱稻277/春江016、巴西陆稻/春江016、旱稻502/郑稻6号）的亲本、F[sub]1[/sub]、B1、B2和F[sub]2[/sub]为试验材料，在人工控制条件下经干旱协迫处理，研究叶片相对含水量的遗传规律。叶片相对含水量表现为数量性状遗传特征，主要受加性效应控制，同时还受到显性效应的影响，其广义遗传率和狭义遗传率均较高。还对栽培稻品种的抗旱性改良方法以及陆稻种质资源在水、陆杂交稻中的利用进行了探讨。

关键词: 水稻, 陆稻, 抗旱性, 叶片相对含水量, 遗传