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Ethylenediurea（EDU） pretreatment alleviated the adverse effects of elevated O3 on Populus alba "Berolinensis" in an urban area

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Journal of Environmental Sciences 2019年第10期31卷 42-50页

作者： Sheng Xu Xingyuan He Kent Burkey Wei Chen Pin Li Yan Li Bo Li Yijing Wang Key Laboratory of Forest Ecology and Management Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Plant Science Research Unit USDA-ARS Raleigh NC 27616 USA Research Center for Eco-environmental Sciences Chinese Academy of Sciences Beijing 100085 China

Ethylenediurea(EDU)has been used as a chemical protectant against ozone(O3).However,its protective effect and physiological mechanisms are still *** present study aimed to investigate the changes of foliar visible injury,physiological characteristics and emission rates of volatile organic compounds(VOCs)in one-year-old Populus alba"Berolinensis"saplings pretreated with EDU and exposed to elevated O3(EO,120μg/m3).The results showed that foliar visible injury symptoms under EO were significantly alleviated in plants with EDU application(p<0.05).Under EO,net photosynthetic rate,the maximum photochemical efficiency of PSII and the photochemical efficiency of PSII of plants pretreated with 300 and600 mg/L EDU were similar to unexposed controls and significantly higher compared to EOstressed plants without EDU pretreatment,*** content was highest in EO without EDU and decreased significantly by 14.9%and 21.3%with 300 and600 mg/L EDU pretreatment,*** pretreatment alone increased superoxide dismutase activity by 10-fold in unexposed plants with further increases of 88.4%and 37.5%in EO plants pretreated with 300 and 600 mg/L EDU pretreatment,respectively(p<0.05).Abscisic acid content declined under EO relative to unexposed controls with the effect partially reversed by EDU ***,VOCs emission rate declined under EO relative to unexposed plants with a recovery of emission rate observed with 300 and 600 mg/L EDU *** findings provided significant evidence that EDU exerted a beneficial effect and protection on the tested plants against O3 stress.

关键词： ground-level O3 Foliar visible injury Open top chambers(OTCs) Poplar VOC emission

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