|Table of Contents|

Effect of Different Concentrations of Cu,Zn and Mn on the Photosynthetic and Antioxidative System of Phytolaccca americana

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年03
Page:
120-127
Research Field:
Publishing date:

Info

Title:
Effect of Different Concentrations of Cu,Zn and Mn on the Photosynthetic and Antioxidative System of Phytolaccca americana
Author(s):
ZHAO Huijun; LIANG Xinxin; WEI Yuqing
(College of Life Science & Engineering,North Minzu University,Yinchuan,Ningxia 750021)
Keywords:
Phytolacca americana; heavy metal treatment; photosynthetic parameters; antioxidative system
PACS:
-
DOI:
10.11937/bfyy.20191911
Abstract:
The heavy metal hyperaccumulator Phytolacca americana was used as material,the effect of different concentrations of Cu,Zn and Mn on SOD,POD and CAT activities after 5,8,12,24 days of stress under hydroponic conditions were studied,and the effect on the photosynthetic system parameters (photosynthetic rate,stomatal conductance,intercellular CO2 concentration,transpiration rate) were also studied,the purpose was to reveal the response mechanism of Phytolacca americana to different heavy metals and provide theoretical basis for phytoremediation of heavy metal contaminated soil.The results showed that although the activities of SOD and POD were increased after Cu and Zn treatment,the significant inhibition of CAT activities disturb the antioxidant enzyme system.Cu and Zn significantly inhibited the photosynthetic rate and stomatal conductance of Phytolacca americana,resulting in an extremely increase in intercellular CO2 concentration and a decrease in transpiration rate.Toxic symptoms such as chlorosis and necrotic spots appeared under Cu and Zn treatment;Cu and Zn could significantly reduce plant biomass and relative growth rate,but after Mn treatment,biological yield did not decline,and stable antioxidant enzyme activity was maintained in leaves,which might be an important mechanism of Mn toleration in Phytolacca americana.

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Last Update: 2020-02-27