Abstract: Some characteristics of rice roots were compared between rice grown in paddy field and rice grown by floating method on natural waters. The characteristics of rice root, including adventitious root number per shoot, root diameter, root activity, percentage of active root surface area in rice grown by floating method on natural waters,were closely similar with rice grown in the field, the dynamics of root development were also alike. It showed that the floating culture method is suitable for studying rice root, it would be expected to become a practical method for root study in the future.

Key words: rice, root, floating culture method, research method

摘要： 对水上种植条件下的水稻根系的一些性状与水田条件下种植时进行了比较。结果表明，水上水稻的根系数量、根系分枝特性、根粗等形态指标以及根系活跃吸收面积百分比等生理指标与水田水稻根系表现出较好的一致性，而且在整个生育期内的动态变化也呈现出较一致的趋势。说明利用水上种植方法研究水稻根系是可行的，能较好地反映较高产量水平的水稻根系在自然环境条件下的生长情况，因此有望成为今后水稻根系研究的一条简便有效的新方法。

关键词: 水稻, 根系, 水上种植, 研究方法