Physiological plasticity in eucalyptus clones in the vegetative stage contributes to drought tolerance  

作　　者：Vilma Marques Ferreira Jailma Ribeiro de Andrade Claudiana Moura dos Santos Sebastiao de Oliveira Maia Júnior Joao Correia de Araújo Neto Andrea Francisca da Silva Santos Vicente Mota da Silva Lucas Teles Bezerra Laurício Endres 

机构地区：[1]Laboratório de Fisiologia Vegetal,Campus de Engenharia e Ciências Agrárias,Universidade Federal de Alagoas,Rio Largo,AL,57072-900,Brazil [2]Laboratório de Ciências Ambientais e Biodiversidade,Departamento de Zootecnia.Centro de Ciências Agrárias,Universidade Estadual do Maranhão,São Luís,MA,65300-000,Brazil [3]Laboratório de Propagação de Plantas.Campus de Engenharia e Ciências Agrárias,Universidade Federal de Alagoas,Rio Largo,AL,57072-900,Brazil [4]Laboratório de Lepidoptera,Museu de Zoologia,Universidade de São Paulo,Ipiranga,São Paulo,SP,04263-000,Brazil

出　　处：《Journal of Forestry Research》2023年第5期1549-1561,共13页林业研究（英文版）

基　　金：supported by the FAPEAL-Foundation for Research Support of the State of Alagoas,Brazil。

摘　　要：With the expansion of eucalyptus crops to areas with severe water limitations,physiological studies involving eucalyptus clones to identify those that are tolerant to water stress become important.The objective of this study was to assess morphological and physiological responses by eucalyptus clones subjected to drought stress and rehydration.The experiment consisted of three eucalyptus clones:VC865,I224 and I144 and two water regimes:control and water stress followed by rehydration,with six replicates.Leaf water potential,gas exchange,maximum quantum efficiency of photo systemⅡand plant height and stem diameter were evaluated under drought stress and rehydration.After6 d of rehydration,the number of leaves,leaf area and dry mass of root,leaf,stem and their total were evaluated.All clones showed intense reduction of gas exchange during the drought stress period,and only VC865 and 1144 showed rapid recovery with 3 d of rehydration.Clone 1224 showed greater reduction in height,stem diameter,number of leaves,water potential at midday(Ψ_(w)_(Midday)),and maximum quantum efficiency of photosystemⅡ(F_(v)/F_(m)).Clones VC865and T144 showed lower reductions inΨ_(wMidday)and F_(v)/F_(m) under stress.VC865 had lower reductions in leaf number,leaf area and higher leaf dry mass,while clone I144 had higher height and lower reduction in root dry mass under.Both these clones showed higher water use efficiency with 3d of rehydration.These different phenotypic plasticities gave the clones VC865 and 1144 efficient mechanisms of acclimatization to stress and more drought tolerance,enhancing their greater capacity for recovery after stress,which allowed lower dry mass reduction.Clone 1224,however,was more susceptible to drought stress,undergoing greater physiological damage with only partial recovery during rehydration.

关 键 词：DROUGHT Eucalyptus species Gas exchanges Post-stress Root dry mass 

分 类 号：S792.39[农业科学—林木遗传育种]