Effects of Lead Stress on Photosynthesis and Physiological and Biochemical Characteristics of Amorpha fruticosa

ZHOU Mei-li, SHEN Guang-shuang, ZHAO Rui-rui, GAO Zhang-ying, CHEN Guo-ping, SHI Fu-chen
2017 Journal of Agricultural Resources and Environment  
The seedlings of Amorpha fruticosa were cultured at lead concentration of 0(control), 100, 300, 600 mg·kg-1 respectively, under pot experiment to observe and analyze the response of physiological indicators such as malonaldehyde(MDA) content, activities of antioxidant enzymes (SOD, POD, CAT), photosynthesis and chlorophyll fluorescence parameters in leaves of Amorpha fruticosa to Pb stress. The results showed that with the increase of Pb concentration, the contents of MDA and activities of SOD
more » ... activities of SOD and POD in leaves of Amorpha fruticosa increased. The net photosynthetic rate(Pn) was significantly higher than that of the control at 100 mg·kg-1 Pb stress treatment. When the Pb concentration reached 300 mg·kg-1, the activity of antioxidant enzymes and relative content of chlorophyll(SPAD) of Amorpha fruticosa increased significantly. The activities of catalases(CAT) began to decrease, the decrease of photosynthesis was mainly affected by nonstomatal limitation, and the chlorophyll fluorescence characteristics of Amorpha fruticosa were not seriously damaged when Amorpha fruticosa was under Pb stress of 600 mg·kg-1. It indicated that Amorpha fruticosa could resist Pb pollution (600 mg·kg-1)in the environment.
doi:10.13254/j.jare.2016.0301 doaj:400ed980de0140e39773e6e8836b651f fatcat:qoy4e2nehbaxbaueyosdfz235a