硅对柱花草铝毒的解毒作用

Al-detoxification by Si in Stylosanthes

为了解硅在解除豆科作物铝毒方面的作用,本文以5个品种的柱花草为材料研究了硅对铝胁迫条件下的植物根伸长及膜脂稳定性的影响。研究结果表明,在铝(30μmol/L)胁迫条件下柱花草根伸长受阻、根尖丙二醛(MDA)含量和抗氧化酶(POD,CAT)活性显著增加,而硅(1.4mmol/L)处理增加根中硅的含量而降低了铝对根伸长、MDA含量和抗氧化酶活性的影响,且铝处理前12h供给的硅和前处理溶液及铝溶液中均加硅处理的影响均显著;在不加硅条件下西卡品种的耐铝性显著低于其它品种,而经硅预处理的植株和在预处理及铝处理期间均供应硅的植株的耐铝性不同品种间的差异不显著。这些结果表明,硅能提高柱花草的耐铝能力并影响品种间耐铝差异性。

The effect of silicon （Si） on aluminum （Al） detoxification in leguminous crops were investigated in this study by analyzing the effect of Si on root elongation and membrane lipid stability in root apices under Al stress in five cultivars of Stylosanthes. It was shown that the root elongation was inhibited and the malonaldehyde （MDA） content in root apices and the antioxidase （peroxydase and catalase） activities of root apices were increased under AI stress （30 μmol/L）, while the effects of Al were significantly alleviated by the addition of Si （1.4 mmol/L）. Moreover, both Si added before AI treatment and Si added simultaneously with AI treatment could alleviate these effects. On the other hand, the cultivar of Seca was shown to be more sensitive to Al than other cultivars in the absent of Si, while Al-resistance distinction among the cultivars ofstylosanthes turned to be non-significant in the present of Si in the pre-cultured solution or both pre-cultured and Al-treatment solutions. These results suggest that Si have elevated Al-resistance and affected Al-resistance distinctly differs in the Stylosanthes.