文献类型：期刊文献

英文题名：The effects of lead stress on photosynthetic function and chloroplast ultrastructure of Robinia pseudoacacia seedlings

作者：Zhou, Jian[1,2] Jiang, Zeping[2] Ma, Jie[1,2] Yang, Lifeng[1] Wei, Yuan[2]

第一作者：Zhou, Jian;周婧

通信作者：Wei, Y[1]

机构：[1]Inst Sci & Technol Henan, Sch Hort & Landscape Architecture, Xinxiang 453003, Henan, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2017

卷号：24

期号：11

起止页码：10718-10726

外文期刊名：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000399401700076)】；

基金：This research was supported by the National Science & Technology Pillar Program during the 12th Five-Year Plan Period (2015BAD07B0103) and the Science and Technology Project of Henan Province, China (162102110133).

语种：英文

外文关键词：Lead stress; Chlorophyll; Fluorescence; Photosynthesis; Ultrastructure; Character

摘要：In this experiment, the effects of different lead (Pb) concentrations (0, 200, 600, 1000, 1400 mg kg(-1)) on photosynthesis and chlorophyll fluorescence in Robinia pseudoacacia seedlings were examined. As Pb concentration increased, chlorophyll a, chlorophyll b, total chlorophyll content, net photosynthetic rate, transpiration rate, stomatal conductance (g(s)), and mesophyll intercellular carbon dioxide concentration were gradually reduced. Maximal photochemical efficiency, photochemical quenching, and quantum yield also decreased. However, the initial fluorescence and nonphotochemical quenching gradually increased. Chloroplasts swelled owing to local plasmolysis and lost most of their starch content, and their thylakoid lamellae gradually became disordered and loosely packed. When the chloroplast envelope was lost under high Pb stress (>= 1000 mg kg(-1)), lipid globules were released into the surrounding mesophyll cell. Multiple regression analysis showed that g(s) and inactivity of the PSII reaction center had the greatest effect on photosynthetic function, whereas inhibition of electron transport had minimal effects on black locust seedlings under Pb stress.