Ethylenediurea(EDU)effects on hybrid larch saplings exposed to ambient or elevated ozone over three growing seasons

作     者：Evgenios Agathokleous Mitsutoshi Kitao Takayoshi Koike Evgenios Agathokleous;Mitsutoshi Kitao;Takayoshi Koike

作者机构：Key Laboratory of Agrometeorology of Jiangsu ProvinceSchool of Applied MeteorologyNanjing University of Information Science and Technology(NUIST)Nanjing 210044People’s Republic of China Research Faculty of AgricultureHokkaido UniversitySapporoHokkaido 060-8589Japan Hokkaido Research CenterForestry and Forest Products Research Institute(FFPRI)Sapporo 062-8516Japan Research Center for Eco-Environmental ScienceChinese Academy of ScienceBeijing 100085People’s Republic of China 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2022年第33卷第1期

页      面：117-135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）] 0907[农学-林学] 08[工学] 0829[工学-林业工程] 0901[农学-作物学] 

基　　金：partly supported by grant#201802 of the Japan’s Forestry and Forest Products Research Institute(FFPRI) KAKENHI grant#JP17F17102 of the Japan Society for the Promotion of Science(JSPS).E.A. support from The Startup Foundation for Introducing Talent of Nanjing University of Information Science&Technology(NUIST),Nanjing,China(Grant No.003080)。 

主　　题：Air pollution Ethylenediurea(EDU) Hormesis Plant protection Tropospheric ozone(o_3) Larix gmelinii var.japonica×L.kaempferi 

摘      要：Ground-level ozone(O_(3))pollution is a persistent environmental issue that can lead to adverse effects on trees and wood production,thus indicating a need for forestry interventions to mediate O_(3) effects.We treated hybrid larch(Larix gmelinii var.japonica×L.kaempferi)saplings grown in nutrient-poor soils with 0 or 400 mg L^(-1) water solutions of the antiozonant ethylenediurea(EDU0,EDU400)and exposed them to ambient O_(3)(AOZ;08:00-18:00≈30 nmol mol^(-1)) or elevated O_(3)(EOZ;08:00-18:00≈60 nmol mol^(-1))over three growing seasons.We found that EDU400 protected saplings against most effects of EOZ,which included extensive visible foliar injury,premature senescence,decreased photosynthetic pigment contents and altered balance between pigments,suppressed gas exchange and biomass production,and impaired leaf litter decay.While EOZ had limited effects on plant growth(suppressed stem diameter),it decreased the total number of buds per plant,an effect that was not observed in the first growing season.These results indicate that responses to EOZ might have implications to plant competitiveness,in the long term,as a result of decreased potential for vegetative growth.However,when buds were standardized per unit of branches biomass,EOZ significantly increased the number of buds per unit of biomass,suggesting a potentially increased investment to bud development,in an effort to enhance growth potential and competitiveness in the next growing season.EDU400 minimized most of these effects of EOZ,significantly enhancing plant health under O_(3)-induced stress.The effect of EDU was attributed mainly to a biochemical mode of action.Therefore,hybrid larch,which is superior to its parents,can be significantly improved by EDU under long-term elevated O_(3) exposure,providing a perspective for enhancing afforestation practices.