Ecophysiological acclimatization to cyclic water stress in Eucalyptus

作     者：Rogerio de Souza Noia Junior Genilda Canuto Amaral Jose Eduardo Macedo Pezzopane Mariana Duarte Silva Fonseca Ana Paula Camara da Silva Talita Miranda Teixeira Xavier Rogério de Souza Noéia Juénior;Genilda Canuto Amaral;José Eduardo Macedo Pezzopane;Mariana Duarte Silva Fonseca;Ana Paula Camara da Silva;Talita Miranda Teixeira Xavier

作者机构：Department of Biosystems Engineering ESALQUniversity of Sao PauloPiracicabaSao PauloBrazil Department of Forestry Sciences NEDTECFederal University of Espirito SantoJero nimo MonteiroEspirito SantoBrazil 

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

年 卷 期：2020年第31卷第3期

页      面：797-806页

核心收录：

学科分类：0907[农学-林学] 08[工学] 0829[工学-林业工程] 09[农学] 

基　　金：supported by the State of Esprito Santo Research Foundation(FAPES Grant No.65768051/14) 

主　　题：Carbon partition Drought Gas exchange Morpho-physiological changes Photosynthetic apparatus 

摘      要：Drought is considered the main environmental factor limiting productivity in eucalyptus plantations in Brazil. However, recent studies have reported that exposure to water deficit conditions enables plants to respond to subsequent stresses. Thus, this study investigates the ecophysiological acclimatization of eucalyptus clones submitted to recurrent water deficit cycles. Eucalyptus seedlings were submitted to three recurrent water deficit cycles and anatomical, morphological and physiological changes were analyzed. The results were:(1) Eucalyptus seedlings responded to water deficits by directing carbohydrates to root and stem growth;(2) Size and number of stomata were reduced;(3) Stomatal conductance decreased which allowed the plants to reduce water losses through transpiration,increasing instantaneous water use efficiency;(4) The relationship between gas exchanges and available water contents allowed the seedlings to uptake the retained soil water athigher tensions;and,(5) Physiological recovery from subsequent water deficits became faster. As a result of these changes, the eucalyptus seedlings recovered from the same degree of water stress more rapidly.