磷对铝胁迫下荞麦元素吸收与运输的影响

Effect of Phosphorus on Element Uptake and Transportation in Buckwheat under Aluminum Stress

以不同耐铝基因型江西荞麦(耐性)和内蒙荞麦(敏感)为材料,采用土培法研究磷对铝胁迫下荞麦生长和Al,P等元素吸收、运输的影响。结果表明,铝胁迫下0.2 g/kg的磷能有效缓解铝毒对荞麦根长的抑制。培养30d后,0.4 g/kg磷处理能显著降低铝在荞麦根系和地上部的积累。铝胁迫下加磷可影响荞麦体内Ca,Mg,Mn,Zn,Fe的吸收,0.4 g/kg铝配施0.4 g/kg磷处理对荞麦根系Ca,Mg吸收最有利,内蒙荞麦根系Mg的含量比不加磷组提高了76.8%,但显著阻碍了铝胁迫下荞麦体内Ca,Fe的向上运输。铝胁迫下配施磷促进荞麦根系对Zn,Fe吸收,有利于Zn向地上部转运。施磷能有效缓解铝毒对荞麦生长的抑制,降低根系和地上部铝含量,有利于Ca,Mg,Mn,Zn,Fe的吸收和Mg,Zn的运输。

The effect of phosphorus on element uptake and transportation under aluminum stress of Jiangxi buckwheat （Al-resistance） was characterized in comparison with that of Neimeng buckwheat （Al-sensitivity）. The results indicated that the inhibition of root elongation induced by AI was ameliorated with the presence of 0.2 g/kg P. After 30 d cultivation, the Al accumulation was significantly reduced at 0.4 g/kg P level both in roots and shoots. Improving P nutrition affected the absorption and transportation of Ca, Mg, Mn, Zn, Fe. The treatment of 0.4 g/kg Al with 0. 4 g/kg P enhanced the absorption capability of Ca and Mg, and Mg content in the root of Neimeng buckwheat increased 76.8% under supplement of P at 0. 4 g/kg compared with control （0 g/kg P）. However, P addition inhibited Ca and Fe transportation from roots to shoots. P application increased the concentration of Zn, Fe in roots, and promoted Zn transportion from roots to shoots. All of these resutls suggested that phosphorus could ameliorate Al inhibition of root growth, reduce Al accumulation in roots and shoots and accelerate absorption of Ca, Mg, Mn, Zn, Fe and transportation of Mg, Zn in buckwheat.