摘要： 用营养液培养方法研究了不同耐低磷玉米幼苗对缺锌胁迫的适应性差异。结果表明，低磷敏感基因型在缺锌时植株各部位锌含量和吸收量显著下降，且变幅均明显高于耐低磷基因型。缺锌处理影响玉米幼苗的磷含量，低磷敏感基因型地上部磷含量较对照显著上升，根系磷含量变幅不大；耐低磷基因型地上部磷含量变幅较小，根系磷含量则显著下降。低磷敏感基因型在缺锌时地上部磷利用率显著下降，根系磷利用率无明显变化，而耐低磷基因型的变化情况正好相反，根系磷利用率受影响的程度大于地上部。

关键词: 玉米, 耐低磷, 基因型, 锌

Abstract: Three low-P tolerant maize genotypes M11,M08 and M02,and three low-P sensitive maize genotypes M06,M07 and M12 were applied to detect the effects of different zinc levels on their growth and uptake of P and Zn at seedling stage.The results demonstrated that Zn deficiency severely hindered the growing of maize.Zn deficiency had a negative influence on plant height,number of leaves and dry weight.Not only did treatment of Zn deficiency severely decreased the absorbing of P and Zn,but Zn stress had greater effect on low-P sensitive genotypes than low-P tolerant genotypes for content of Zn at seedling stage.Under Zn deficiency condition,the content of P in shoot of sensitive genotypes were significant increased,but those in root were less effected;on the other hand,the content of P was significant decreased in root of tolerant genotypes.There were differences of P utilizat ion efficiency in response to Zn deficiency among different genotypes.P utilization efficiency in shoot of sensitive genotypes was decreased but those in root of tolerant genotypes were increased.

Key words: Maize, Low-P tolerant, Genotype, Zn

中图分类号: 

• S513.01