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

作　　者：Dalong Zhang Huihua Yang Xiaolu Chen Yan Li Yunzhou Li Hongye Liu Xulin Wu Min Wei 

机构地区：[1]College of Horticultural Science and Engineering,Shandong Agricultural University,Tai'an,Shandong 271018,China [2]College of Agriculture,Guizhou University,Guiyang,Guizhou 550025,China

出　　处：《Horticultural Plant Journal》2024年第5期1165-1176,共12页园艺学报（英文版）

基　　金：y the National Natural Science Foundation of China(Grant No.32102466);the Major Scientific Innovation Project of Shandong Province(Grant No.2022CXGC020708).

摘　　要：Atmospheric CO_(2)concentration is elevated globally,which has“CO_(2)fertilization effects”and potentially improves plant photosynthesis,yield,and productivity.Despite the beneficial effect of CO_(2)fertilization being modulated by vapor pressure deficit(VPD),the underlying mechanism is highly uncertain.In 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 analyses.Beneficial CO_(2)fertilization effects were offset under high VPD conditions and were constrained by plant water stress and photosynthetic CO_(2)utilization.High VPD induced a large passive water driving force,which disrupted the water balance and consequently caused plant water deficit.Leaf water potential,turgor pressure,and hydraulic conductance declined under high VPD stress.The 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 stress.Increased 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 space.High VPD also significantly increased mesophyll resistance for CO_(2)transport from stomatal cavity to fixation site inside chloroplast.The chloroplast“sink”CO_(2)availability was constrained by stomatal and mesophyll resistance under high VPD stress,despite the atmospheric“source”CO_(2)concentration being elevated.Thus,ABA-and JA-mediated drought-resistant mechanisms potentially modified the beneficial effect of CO_(2)fertilization on photosynthesis,plant growth,and yield productivity.This 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 

分 类 号：S641.2[农业科学—蔬菜学]