重金属及盐胁迫对绿金合果芋生理特性的影响

以绿金合果芋（Syngonium podophyllum Schott）为研究对象，研究了重金属离子（Pb2+，Cd2+）、盐（NaCl）及其复合溶液对其光合系统、膜系统及抗氧化酶系统的影响。结果表明: 随着重金属及盐处理浓度的增加，绿金合果芋叶片内叶绿素、类胡萝卜素、可溶性蛋白、可溶性糖含量和POD活性均受到抑制；游离脯氨酸含量、CAT活性具应激效应，即在低浓度胁迫下升高，高浓度下降低；丙二醛含量和相对电导率均随胁迫浓度的增加呈上升趋势；SOD活性随重金属处理浓度的增加而降低，但在NaCl处理下则表现为低浓度下升高，高浓度下降低。通过本研究发现，绿金合果芋的光合系统、膜系统和抗氧化酶活性等指标对重金属胁迫的反应均较为灵敏，可作为评估重金属及盐胁迫对其危害的指标。

Effects of heavy metals and salt stress on physiological characteristics of Syngonium podophyllum Schott

The influence of two heavy metals （Pb2+ ， Cd2+） ， salt stress （NaCl） and their mixed solutions on the photosynthetic system，membrane system and antioxidant system of Syngonium podophyllum Schott were investigated. The results showed that with the increasing concentration of single and mixed solution treatment， chlorophyll， carotenoids， soluble protein and soluble sugar content and POD activity in Syngonium podophyllum Schott were all inhibited. The content of free proline and CAT activity increased first and then decreased with the increasing concentration of stress， MDA content and relative conductivity increased with increasing concentration of stress. SOD activtly decreased with the increasing concentration of heavy metals, but increased first and then decreased with the increasing concentration of NaCl. This study suggested that， chlorophyll content， membrane system and antioxidant system of Syngonium podophyllum Schott were sensitive to the stress of heavy metals and salt. These parameters could be taken as indicators in evaluating the damage of heavy metals and salt stress on Syngonium podophyllum Schott.