Abstract: A series of experiments of chelator buffered nutrient solution culture of pZn²⁺ (9.7,10.3,10.6,11.0,11.3 and >11.5) were conducted with the Zn-efficient rice cultivars IR34, IR36, IR8192 and Zn inefficient rice cultivars IR26, Erjiufeng, Ce64-7, to study the differences of different Zn efficient rice genotype in agronomic characteristics. There is significant difference to resistance zinc deficiency among different rice genotypes. There are obvious distinction in effect of low zinc activities on agronomic characteristics of rice seedlings. Of them, there are obvious differences in leaf growth rate, relative leaf number and plant height, especially, sheath length. In additional, the zinc activity which has the most difference of effect on these indexes is about pZn²⁺ 10.6～11.0, and might be the best one to screen zinc efficient rice genotype.

Key words: rice, Zn nutrient, genotype, screening index

摘要： 以耐低锌水稻品种IR34、IR36、IR8192和锌敏感水稻品种IR26、测64-7、二九丰为材料，采用HEDTA螯合缓冲营养液培养法，在各种锌离子活度（pZn2+）9.7、10.3、10.6、11.0、11.3、>11.5下，研究了水稻锌营养基因型差异在农艺性状上的表现。结果表明，水稻锌营养存在明显的基因型差异，这种差异在低锌离子活度对水稻秧苗的农艺性状影响上有明显的区别，其中出叶速率和相对出叶数、株高尤其是鞘高及最大根长差异都较明显，可作为鉴定筛选锌高效和锌敏感的有效形态指标。低锌离子活度下秧苗缺锌症的出现与否和早迟，也可作为鉴定筛选锌高效和锌敏感水稻品种的指标。另外，这些指标对锌离子活度反应差异最大时的锌离子活度大多在pZn2+10.6～11.0，这个活度可能也是筛选锌高效水稻基因型时的最佳锌离子活度。

关键词: 水稻, 锌营养, 基因型, 筛选指标