缺磷胁迫对长豇豆幼苗脱落酸含量的影响

研究耐缺磷程度不同的长豇豆品种在缺磷胁迫下脱落酸(ABA)含量的变化。结果表明缺磷胁迫下长豇豆幼苗根系ABA含量都增高,缺磷前期下降后升至1个高峰后再降低,高峰出现的迟早与品种耐缺磷性有密切关系,不耐缺磷的二芦白比耐缺磷的芦花白出现早,平均升幅香港青二芦白芦花白。缺磷胁迫下长豇豆幼苗老茎叶和最嫩完全展开叶ABA含量升高,平均升幅香港青二芦白芦花白,但缺磷后期ABA含量二芦白香港青芦花白;缺磷胁迫下幼苗嫩茎叶ABA含量各品种都升高,升幅芦花白二芦白香港青。缺磷胁迫下长豇豆幼苗茎叶ABA含量的增加可能促进磷和水分的运输、减轻膜质过氧化,是对缺磷胁迫的适应机制之一。

Effect of phosphorus-deficiency stress on abscisic acid contents in asparagus bean seedlings

Under phosphorus-deficiency stress, changes of abscisic acid (ABA)contents in seedling of three asparagus bean Vigna unquiculata W. ssp. sesquipedalis (L.) Verd] cultivars differing in tolerance to phosphorus-deficiency were studied. The results showed that ABA contents in root increased under P-deficiency stress, ABA contents declined early, then increased to a peak, and declined again, the peak appeared earlier in cv. Erlubai (Low P-deficiency-tolerance) than cv. Luhuabai (High P-deficiency-tolerance). The increase in cv. Xianggangqing>cv. Erlubai>cv. Luhuabai. The ABA contents in older leaf, stem and youngest fully-expanded leaf increased under P-deficiency stress, the increase in cv. Xianggangqing>cv. Erlubai>cv. Luhuabai, but that in cv. Erlubai>cv. Xianggangqing> cv. Luhuabai at later stage. The ABA contents in younger leaf and stem increased under P-deficiency stress, the increase in cv. Luhuabai >cv. Erlubai> cv. Xianggangqing. The increase of ABA contents in leaf and stem under P-deficiency stress might enhance transportation of phosphorus and water, reduce membrane lipid peroxidation.