Adaptive responses to drought of two Retama raetam subspecies from Tunisia

作     者：Ricardo Gil Dhikra Zayoud Zeineb Ouerghi Monica Boscaiu Oscar Vicente Mohamed Neffati Ricardo Gil;Dhikra Zayoud;Zeineb Ouerghi;Monica Boscaiu;Oscar Vicente;Mohamed Neffati

作者机构：Instituto de Biologfa Molecular y Celular de Plantas(IBMCPUPV-CSIC)Universitat Politecnica de Valencia46022 ValenciaSpain Laboratoire des Ecosystemes Pastoraux et Valorisation des Plantes Spontanees et des Micro-organismes AssociesInstitut des Regions AridesUniversite de Gabes4119 MedenineTunisia Departement de BiologieFaculte des Sciences de Tunis1060 TunisTunisia Instituto Agroforestal Mediterraneo(IAM)Universitat Politecnica de Valencia46022 ValenciaSpain Instituto de Conservacion y Mejora de la Agrodivcrsidad Valenciana(COMAV)Universitat Politecnica de Valencia46022 ValenciaSpain 

出 版 物：《Journal of Plant Ecology》 (植物生态学报（英文版）)

年 卷 期：2021年第14卷第3期

页      面：527-540页

核心收录：

学科分类：07[理学] 0713[理学-生态学] 

基　　金：Dhikra Zayoud's stay in Valencia was supported by a grant from the Tunisian Ministry of Higher Education and Scientific Research 

主　　题：germination leaf gas exchange osmolytes Retama raetam water stress xerophytes 

摘      要：Aims The survival and ecological distribution of plants in arid habitats are mainly conditioned by water availability and physiological adaptations to withstand *** the present study,we have compared the physiological responses to drought of two Retama raetam(retama)subspecies from Tunisia,one of them living under the desert climate(***)and the other one growing on the coast(***).Methods To physiologically characterize the two *** subspecies,and to elucidate their main mechanisms underlying their tolerance to drought stress,parameters related to seed germination,growth,photosynthesis(net photosynthetic rate,intracellular CO_(2) concentration,transpiration rate,stomatal conductance and water-use efficiency)and accumulation of osmolytes(proline,glycine betaine[GB]and soluble sugars)were determined in 4-month-old plants subjected to stress for up to 1 *** Findings Drought significantly inhibited germination,growth and all the evaluated photosynthetic *** of *** *** were severely affected by drought after 3 weeks of treatment when photosynthesis rates were up to 7-fold lower than in the *** the same time,proline and GB significantly accumulated compared with the irrigated controls,but much less than in *** ***;in the latter subspecies,proline and GB increased to levels 24-and 6-fold higher,respectively,than in the corresponding *** summary,the population living in the desert region exhibited stronger tolerance to drought stress than that adapted to the semiarid littoral climate,suggesting that tolerance in *** is dependent on accumulation of osmolytes.