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Gas flaring cause shifts in mesophyll and stomatal functional traits of Betula pubescens Ehrh.

Journal of Forestry Research 2023年第6期34卷 2079-2087页

作者： dina a.ronzhina Svetlana V.Migalina Irek A.Yusupov Institute Botanic Garden Ural BranchRussian Academy of Sciences202a 8 Marta Str.EkaterinburgRussia 620144 Tyumen State University 6 Volodarskogo Str.TyumenRussia 625003

In petroleum-producing territories of West Siberia(Russia),oil well gas flares have a thermal effect on nearby plant *** communities can be used as models for studying plant acclimation to global *** the present study on the effect of the hydrothermal regime at the flare sites on mesophyll and stomatal functional traits of Betula pubescens,leaves were collected from trees at250 m(control site[CS]),200,150 and 100 m(maximum impact site[MIS])from a *** the CS to MIS site,the average annual air temperature increased by 0.5℃and bog water level decreased by 17 *** plants from the MIS,stomata were 16%smaller and density was 20%lower compared to those at the CS,resulting in lower maximum stomatal conductance in plants from the MIS(mean±SE:MIS 0.84±0.05 mol·m^(-2)s^(-1),CS 1.24±0.06 mol·m^(-2)s^(-1);F=12.6,P<0.01).Mesophyll cell volume was 1.9 times lower at MIS than at *** numbers per cell also declined with distance from the flares,from 21(MIS)to18(CS;F=15.6,P<0.001),and chloroplast volume was 24%higher at the CS,whereas the number of mesophyll cells and chloroplasts numbers per unit leaf area were 1.9 and 1.8 times higher at the MIS than at the CS,*** a result,leaves from the MIS had a large total mesophyll cell(Ames/A)and chloroplast(Achl/A)surface area per unit leaf area,resulting in a 46%increase in mesophyll conductance in plants from the ***,structural changes in leaf epidermis consisted of a decrease in stomatal size and number,could lower transpiration losses with higher temperatures and less *** compensate for the reduction in leaf conductance due to a decrease in stomatal conductance under these conditions,an increase in the number of mesophyll cells and chloroplasts per unit area provides a greater gas-exchange area and mesophyll conductance.

关键词： Leaf traits Mesophyll cell volume Chloroplast numbers Mesophyll conductance Stomatal conductance

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