关键词: 重金属；盐胁迫, 绿金合果芋, 生理特性

Abstract: 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.

Key words: heavy metal, salt stress, Syngonium podophyllum Schott, physiological characteristics