Abstract: The physiological characteristics of rice in different Zn²⁺ activities(pZn²⁺ >11.5, 11.3, 11.0, 10.6, 10.3, 9.7) were studied with the Zn efficient rice cultivars IR34,IR36,IR8192 and Zn inefficient rice cultivars IR26, Ce64 7, Biyuzaonuo grown in chelator buffered nutrient solution. There was significant difference in tolerance to zinc deficiency among different rice genotypes. Obvious effects of low zinc activities were noted on physiological characteristic of rice seedlings. There were obvious differences among chlorophyll content, photosynthetic rate, MDA concentration and H + excretion of root. As pZn²⁺ increased, chlorophyll content and photosynthetic rate decreased at a slower pace in Zn efficient cultivars compared to Zn inefficient cultivars, MDA concentration increased slower while H⁺ excretion of root increased faster in Zn efficient cultivars than those in Zn inefficient cultivars.It was suggested that the above indications could be used as indices to Zn efficiency of rice.

Key words: rice, genotype, zinc, physiological characteristic, nutrient efficiency

摘要： 采用HEDTA螯合缓冲营养液培养法，研究了水稻锌营养高效基因型IR34、IR36、IR8192和锌敏感基因型IR26、测647、碧玉早糯在不同锌离子活度（pZn2+>11.5，11.3, 11.0, 10.6, 10.3, 9.7）下的生理特性。结果表明，锌离子活度在对不同水稻基因型秧苗生理特性影响上有明显的区别，其中叶绿素含量、光合速率、MDA含量和根系H+分泌量差异比较明显。在供锌水平较低情况下，水稻锌营养高效基因型叶绿素含量下降速度慢，光合速率降低幅度小，MDA含量升高的幅度小，根系能分泌更多的H+，这些指标可以作为衡量水稻锌营养效率的指标。

关键词: 水稻, 基因型, 锌, 生理特性, 营养效率