摘要： 为探索缺锌导致玉米生长受抑和体内激素代谢的关系,用溶液培养的方法研究不同供锌水平下,玉米体内的色氨酸、IAA、GA₃、GA₄和ABA含量变化,并在缺锌处理一段时间后施用色氨酸或IAA检验其对缺锌症状的影响。结果表明,缺锌与低锌均使玉米体内的色氨酸和IAA含量降低,敏感基因型比非敏感基因型降低的更多,同时IAA由地上部向根部的运输受阻;缺锌早期非敏感基因型茎叶的ABA和GA₄的含量升高,而敏感基因型则降低,这与调节它们的抗性大小和代偿性生长有关。在同一时期缺锌,不同基因型玉米GA₃含量均升高;色氨酸与IAA对敏感基因型玉米的缺锌症状有一定的恢复作用,但对非敏感基因型玉米的缺锌则没有恢复作用。缺锌时玉米体内的IAA、GA₃、GA₄和ABA等激素水平与生长之间并非总是一致的相关关系,生长速率也会影响体内的激素水平,同时激素水平还参与植物的抗性调节。

关键词: 缺锌, 玉米, IAA, GA₃, GA₄, ABA

Abstract: The relationship was investigated between hormone metabolism and growth inhibition of maize caused by zinc deficiency.Solution culture was used to study the changes of contents of tryptophan, auxin, gibberellin A3, gibberellin A4 and abscisic acid in maize under different levels of zinc.Tryptophan or auxin was added after zinc deficiency treatment in order to research the effects on maize under zinc deficiency.Both zinc deficiency and low-zinc resulted in the reduction of tryptophan and auxin, the sensitive genotypes reduced much more than the insensitive genotypes, also, the transport of auxin from aerial parts to root was baffled.In the early stage of zinc deficiency, the contents of abscisic acid and gibberellin A4 in stems and leaves increased in the insensitive genotypes while decreased in the sensitive genotypes,which maybe related to resistance and compensatory growth of plants.Meanwhile, the contents of gibberellin A3 increased in both two genotypes.The addition of both tryptophan and auxin could help the sensitive genotypes to recover from zinc deficiency, but had no effect on the insensitive genotypes.There was no consistent correlativity between growth and contents of auxin, gibberellin A3, gibberellin A4 and abscisic acid under zinc deficiency.The hormone levels which could be influenced by growth speed participated in the resistance regulation．

Key words: Zinc deficiency, Maize( Zea mays L． ), IAA, GA₃, GA₄, ABA

中图分类号: 

• Q945.78

• Q946.885