茉莉酸对镉胁迫下玉米幼苗叶片生理特性的影响

采用溶液培养方法,研究茉莉酸对玉米幼苗叶片抗镉性的影响。结果表明,镉胁迫显著提高玉米叶片丙二醛(MDA)、H_2O_2含量和超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽转移酶(GST)、谷胱甘肽过氧化物酶(GPX)活性,降低过氧化物酶(POD)、抗坏血酸过氧化物酶(APX)和谷胱甘肽还原酶(GR)活性,降低叶绿素a、叶绿素b和类胡萝卜素含量及生物量。与单独镉胁迫相比,外源茉莉酸处理可显著提高镉胁迫下叶片CAT、POD、APX和GR活性,显著提高叶绿素a、叶绿素b和类胡萝卜素含量及生物量,显著降低镉胁迫下叶片MDA和H_2O_2含量,从而缓解其造成的伤害。结果表明,外源茉莉酸可明显提高玉米幼苗叶片的抗氧化能力和光合色素含量,从而增加生物量的积累,缓解镉胁迫造成的伤害。

Effects of Jasmonic Acid on the Leaf Physiological Characteristics of Maize Seedlings under Cadmium Stress

The effects of exogenous jasmonic acid (JA) on the cadmium resistance of maize leaves were studied. The results showed that cadmium stress markedly increased the contents of MDA and H₂O₂ and the activities of SOD, CAT, GST and GPX. However, cadmium stress markedly decreased the activities of POD, APX and GR, the contents of chlorophyll a, b and carotenoid and the dry weight of maize seedling. Compared with cadmium stress alone, exogenous JA significantly increased the activities of CAT, POD, GR and APX, which resulted in the decrease in the content of MDA and H₂O₂, the increase in the content of chlorophyll a, b and carotenoid and the dry weight of maize seedling. Above results suggested that exogenos JA can alleviate the injuries induced by cadmium stress by enhancing the antioxidant ability and increasing the chorophyll a, b and carotenoid of maize seedling.