大田生产条件下不同品种水稻植株中镉的分布特点

通过4个水稻品种在大田生产条件下的试验，研究分析了水稻植株Cd积累和分布的特点。结果表明，水稻的根系是吸收Cd的主要器官，也是Cd的主要储存场所，无论在水稻分蘖期还是成熟期都很明显；在水稻成熟期，籽粒（糙米）中Cd的含量显著地低于其他器官，水稻植株器官中Cd的分布情况大致为：根〉鞘＞叶＞茎＞糙米，但随着品种的不同而有所变化；根据4个水稻品种在成熟期的植株Cd积累量的分析，9311是植株高累积Cd的水稻品种，Jia－48和Jia－51的糙米中Cd的积累很低；水稻品种间对于Cd的吸收和累积能力有显著的差异，但水稻类型间（粳稻与籼稻间）Cd含量没有显著差异，因此不能按照水稻类型来选育糙米中低Cd积累品种，应针对品种选育出糙米中低Cd积累的高产优质水稻品种。

The Cd Uptake and Distribution Features in Plant Organs of Four Rice Cultivars

Field experiment was conducted to investigate the features of cadmium （Cd） accumulation and distribution of rice plant organs in four rice varieties. The results showed that the rice root was the main plant organ to uptake Cd, it also was the main storage site of Cd.The Cd content of grain （brown rice ） was significantly lower than in other organs at maturity stage.The concentration order of heavy metal Cd in different plant organs was root〉 sheath 〉 leaf 〉 stem 〉grain, but the order changed with the different varieties. Based on the results which Cd accumulation of four rice varieties was analysed in mature stage, 9311 was the variety of high accumulation Cd, the Cd content of brown rice was very low in Jia-48 and Jia-51.The ability to Cd uptake and accumulation was significantly different in rice varieties, but the inter-type rice（japonica and indica rooms） was not significantly different.