Effects of ozone (O-3) and ethylenediurea (EDU) on the ecological stoichiometry of a willow grown in a free-air exposure system

文献类型： 外文期刊

第一作者： Agathokleous, Evgenios

作者： Agathokleous, Evgenios;Kitao, Mitsutoshi;Agathokleous, Evgenios;Qingnan, Chu;Watanabe, Toshihiro;Koike, Takayoshi;Qingnan, Chu;Saitanis, Costas J.;Paoletti, Elena;Manning, William J.

作者机构：

关键词： Iron homeostasis; Nutrient cycling; Nutrient resorption; Ozone; Re-translocation

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2018 年 238 卷

页码：

收录情况： SCI

摘要： Ground-level ozone (O-3) concentrations have been elevating in the last century. While there has been a notable progress in understanding O-3 effects on vegetation, O-3 effects on ecological stoichiometry remain unclear, especially early in the oxidative stress. Ethyelenediurea (EDU) is a chemical compound widely applied in research projects as protectant of plants against O-3 injury, however its mode of action remains unclear. To investigate O-3 and EDU effects early in the stress, we sprayed willow (Salix sachalinensis) plants with 0, 200 or 400 mg EDU L-1, and exposed them to either low ambient O-3 (AOZ) or elevated 03 (EOZ) levels during the daytime, for about one month, in a free air O-3 controlled exposure (FACE); EDU treatment was repeated every nine days. We collected samples for analyses from basal, top, and shed leaves, before leaves develop visible O-3 symptoms. We found that O-3 altered the ecological stoichiometry, including impacts in nutrient resorption efficiency, early in the stress. The relation between P content and Fe content seemed to have a critical role in maintaining homeostasis in an effort to prevent O-3-induced damage. Photosynthetic pigments and P content appeared to play an important role in EDU mode of action. This study provides novel insights on the stress biology which are of ecological and toxicological importance. (C) 2018 Elsevier Ltd. All rights reserved.

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