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Response of gas-exchange characteristics and chlorophyll fluorescence to acute sulfur dioxide exposure in landscape plants

文献类型: 外文期刊

作者: Duan, Jiuju 1 ; Fu, Baochun 1 ; Kang, Hongmei 1 ; Song, Zhuoqin 1 ; Jia, Minlong 1 ; Cao, Dongmei 1 ; Wei, Aili 2 ;

作者机构: 1.Shanxi Acad Agr Sci, Inst Hort, Taiyuan 030031, Shanxi, Peoples R China

2.Taiyuan Normal Univ, Dept Biol, Taiyuan 030031, Shanxi, Peoples R China

关键词: Sulfur dioxide exposure; Urban landscape plants; Gas-exchange characteristics; Chlorophyll fluorescence imaging; Sulfur content

期刊名称:ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY ( 影响因子:6.291; 五年影响因子:6.393 )

ISSN: 0147-6513

年卷期: 2019 年 171 卷

页码:

收录情况: SCI

摘要: To explore the toxicity and action mechanism of acute sulfur dioxide (SO2) on urban landscape plants, a simulated SO2 stress environment by using fumigation chamber involving increasing SO2 concentration (0, 25, 50, 100, 200 mg m(-3)) was carried out among three species. After 72 h of exposure, SO2-induced oxidative damage indicated by electrolyte leakage increased with higher dose of SO2. Meanwhile, SO2 decreased the contents of chlorophyll a, chlorophyll b and carotenoid and increased the contents of sulfur. Net photosynthetic rate (P-n) decreased as a result of stomatal closure when SO2 dose was lower than 50 mg m(-3), out of this range, non stomatal limitation play a dominant role in the decline of P-n. Simultaneous measurements of chlorophyll fluorescence imaging (CFI) also revealed that the maximal quantum efficiency of PSII photochemistry in dark-adapted state (F-v/F-m) and the realized operating efficiency of PSII photochemistry (F-q'/F-m') was reduced by SO2 in a dose-dependent manner. In addition, the maximum quantum efficiency of PSII photochemistry in light-adapted state (F-v'/F-m') and the PSII efficiency factor (F-q'/F-v') decreased when exposure to SO2. These results implied that acute SO2 exposure induced photoinhibition of PSII reaction centers in landscape plants. Our study also indicated that different urban landscape plant species resist differently to SO2: Euonymus kiautschovicus > Ligustrum vicaryi > Syringe oblate according to gas-exchange characteristics and chlorophyll fluorescence responses.

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