两种基因型水稻对环境镉吸收与再分配差异性比较研究

利用水培试验对两种基因型水稻（杂交稻“威优１１２６”和常规稻“渐辐８０２”）,在不同生长发育时期对环境Ｃｄ的吸收和再分配特性进行了比较研究。结果表明,杂交水稻比常规水稻对Ｃｄ有更强的吸收及向其茎叶和籽粒转达的能力。两类水稻在幼穗分化之前吸收的Ｃｄ不到全生育期吸收总量的１０％,抽穗期以后吸收的Ｃｄ占５１％以上。水稻糙米Ｃｄ含量与植株吸收累积的Ｃｄ量呈极显著正相关。就Ｃｄ对稻米卫生品质的影响而言,生殖生长期是水稻的Ｃｄ污染敏感期,杂交水稻对Ｃｄ污染的敏感性大于常规水稻。

Comparative Studies on the Difference of the Uptake and Redstribution of Environmental Cd by Two Genic Rice

comparative study was made on the characteristics of Cd uptake and redistribution in the different stages by two genic rice(i.e., hybrid rice "Weiyou 1126" and conventional rice "Zhefu 802")under water culture experiment. The results showed that hybrid rice had greater ability than conventional rice in Cd uptake and transportation to the straw and grain. The Cd uptake by all of the rice plants before ear initiation was less than 10% of the total Cd uptake by rice during the life time. More than 51% of the total Cd was uptaked by rice after heading stage.There was a significant active relationship between Cd content of brown rice and the ainount of Cd uptake by both rice plants. Considering the influence of Cd on the hygienic quality of brown rice The rice in its reproductive stage was sensitive to Cd pollution and hybrid rice was more sensitive to Cd than the conventional one.