Protecting the photosynthetic performance of snap bean under free air ozone exposure

作     者：Lu Zhang Yasutomo Hoshika Elisa Carrari Kent O.Burkey Elena Paoletti 

作者机构：College of Horticulture Northeast Agricultural University Institute of Sustainable Plant Protection National Research Council Plant Science Research UnitUSDA-ARS 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2018年第30卷第4期

页      面：31-40页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 09[农学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学] 0902[农学-园艺学] 090202[农学-蔬菜学] 

基　　金：supported by the National Natural Science Foundation of China (No. 31401895) ‘Young Talents’ project of Northeast Agricultural University of China (No. 14Q10) financial support to the first author for his visiting research in Italy (No. 201606615002) The ozone FACE was financed by the Foundation Cassa di Risparmio of Florence (No. 2013/7956) supported in part by the LIFE15 ENV/IT/000183 project MOTTLES 

主　　题：Ethylenediurea Free air controlled exposure Kinetin Ozone Phaseolus vulgaris 

摘      要：Tropospheric ozone（O3） is a major air pollutant and causes serious injury to vegetation. To protect sensitive plants from O3 damage, several agrochemicals have been assessed,including cytokinin（e.g., kinetin, KIN） and ethylenediurea（EDU） with cytokinin-like *** higher plant, leaves are primarily injured by O3 and protective agrochemicals are often applied by leaf spraying. To our knowledge, the mitigating abilities of EDU and KIN have not been compared directly in a realistic setup. In the present research, impacts of elevated O3（2 × ambient O3, 24 hr per day, for 8 days） on an O3 sensitive line（S156） of snap bean（Phaseolus vulgaris）, which is often used for biomonitoring O3 pollution, were studied in a free air controlled exposure system. The day before starting the O3 exposure, plants were sprayed with a solution of EDU（300 ppm）, KIN（1 mmol/L） or distilled water, to compare their protective abilities. The results demonstrated that 2 × ambient O3 inhibited net photosynthetic rate and stomatal conductance, increased the minimal fluorescence yield of the dark-adapted state, decreased the maximal quantum yield of PSII photochemistry, and led to visible injury. KIN and EDU alleviated the reduction of the photosynthetic performance, and visible injury under O3 fumigation. The plants sprayed with EDU showed greater ability to mitigate the O3 damage than those sprayed with KIN. Chlorophyll fluorescence imaging may have detected more precisely the differences in O3 response across the leaf than the conventional fluorometer.