不同羽扇豆锰吸收差异及其机制探讨

Research on Differences of Manganese Uptake in Different Lupine Species and Its Mechanism

以白羽扇豆(Lupinus albus L.cv. Kiev)和窄叶羽扇豆(Lupinus angustifolius L.cv. Gungurru)为材料,采用溶液培养方法,在玻璃温室条件下对2种羽扇豆在高锰(10μmol/L)和低锰(0.5μmol/L)环境中的锰吸收差异及其可能机制进行分析.结果表明,无论在高锰还是低锰条件下,白羽扇豆植株地上部和根系的锰吸收和转运能力、木质部和韧皮部汁液中的锰含量及低分子量有机酸含量在不同生长阶段都显著高于窄叶羽扇豆,且2种羽扇豆植株韧皮部汁液中锰含量与其低分子量有机酸含量呈显著正相关.研究发现,2种羽扇豆的吸锰能力差异与其种子大小、种子中锰含量、锰的吸收和转运能力以及木质部和韧皮部低分子量有机酸含量有密切关系;锰离子与低分子有机酸形成的可溶性有机复合体可能是促进锰在植物韧皮部转移的一个重要机制.

A solution-culture experiment was carried out in a greenhouse under controlled conditions to investigate manganese(Mn)uptake differences of white lupine(Lupinus albus L.cv.Kiev)and narrow-leaved lupine(Lupinus angustifolius L.cv.Gungurru)and its possible mechanism.The results showed that whether at low Mn2+ supply level(0.5 μmol/L)or at high Mn2+ supply level(10 μmol/L),the Mn2+ accumulation and Mn2+ translocation rate at both shoots and roots,and the contents of Mn2+ and low-molecular-weight organic acids ...