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Responses of leaf stomatal and mesophyll conductance to abiotic stress factors

Journal of Integrative Agriculture 2022年第10期21卷 2787-2804页

作者： LI Sheng-lan TAN Ting-ting FAN Yuan-fang Muhammad Ali RAZA WANG Zhong-lin WANG Bei-bei ZHANG Jia-wei TAN Xian-ming CHEN Ping Iram SHAFIQ YANG Wen-yu YANG Feng College of Agronomy Sichuan Agricultural UniversityChengdu 611130P.R.China Sichuan Engineering Research Center for Crop Strip Intercropping Chengdu 611130P.R.China Key Laboratory of Crop Ecophysiology and Farming System in Southwest Ministry of AgricultureChengdu 611130P.R.China

Plant photosynthesis assimilates CO_(2)from the atmosphere,and CO_(2)diffusion efficiency is mainly constrained by stomatal and mesophyll *** stomatal and mesophyll conductance of plants are sensitive to abiotic stress factors,which affect the CO_(2)concentrations at carboxylation sites to control photosynthetic *** studies conducted relevant reviews on the responses of stomatal conductance to the environment and the limitations of mesophyll conductance by internal structure and biochemical ***,reviews on the abiotic stress factors that systematically regulate plant CO_(2)diffusion are ***,in this review,the rapid and long-term responses of stomatal and mesophyll conductance to abiotic stress factors(such as light intensity,drought,CO_(2)concentration and temperature)and their physiological mechanisms are ***,future research trends are also investigated.

关键词： CO_(2)diffusion abiotic stress factors stomatal conductance mesophyll conductance

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

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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,Pmesophyll 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,Pmesophyll 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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VPD modifies CO_(2) fertilization effect on tomato plants via abscisic acid and jasmonic acid signaling pathways

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Horticultural Plant Journal 2024年第5期10卷 1165-1176页

作者： Dalong Zhang Huihua Yang Xiaolu Chen Yan Li Yunzhou Li Hongye Liu Xulin Wu Min Wei College of Horticultural Science and Engineering Shandong Agricultural UniversityTai'anShandong 271018China College of Agriculture Guizhou UniversityGuiyangGuizhou 550025China

Atmospheric CO_(2)concentration is elevated globally,which has“CO_(2)fertilization effects”and potentially improves plant photosynthesis,yield,and *** the beneficial effect of CO_(2)fertilization being modulated by vapor pressure deficit(VPD),the underlying mechanism is highly *** the present study,the potential roles of hormones in determining CO_(2)fertilization effects under contrasting high and low VPD conditions were investigated by integrated physiological and transcriptomic *** CO_(2)fertilization effects were offset under high VPD conditions and were constrained by plant water stress and photosynthetic CO_(2)*** VPD induced a large passive water driving force,which disrupted the water balance and consequently caused plant water *** water potential,turgor pressure,and hydraulic conductance declined under high VPD *** physiological evidence combined with transcriptomic analyses demonstrated that abscisic acid(ABA)and jasmonic acid(JA)potentially acted as drought-signaling molecules in response to high VPD *** foliar ABA and JA content triggered stomatal closure to prevent excessive water loss under high VPD stress,which simultaneously increased the diffusion resistance for CO_(2)uptake from atmosphere to leaf intercellular *** VPD also significantly increased mesophyll resistance for CO_(2)transport from stomatal cavity to fixation site inside *** chloroplast“sink”CO_(2)availability was constrained by stomatal and mesophyll resistance under high VPD stress,despite the atmospheric“source”CO_(2)concentration being ***,ABA-and JA-mediated drought-resistant mechanisms potentially modified the beneficial effect of CO_(2)fertilization on photosynthesis,plant growth,and yield *** study provides valuable information for improving the utilization efficiency of CO_(2)fertilization and a better understanding of the physiological processes.

关键词： Abscisic acid CO_(2) fertilization Jasmonic acid mesophyll conductance Stomatal conductance Vapor pressure deficit

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