Differential physiological and antioxidative responses to drought stress and recovery among four contrasting Argania spinosa ecotypes

Journal of plant interactions

article

Abdelghani Chakhchar¹  Mouna Lamaoui¹  Salama Aissam¹  Abderrahim Ferradous²  Said Wahbi³  Abdelhamid El Mousadik⁴  Saad Ibnsouda-Koraichi⁵  Abdelkarim Filali-Maltouf⁶  Cherkaoui El Modafar¹ 

[1] Laboratoire de Biotechnologie Valorisation et Protection des Agroressources, Faculté des Sciences et Techniques Guéliz, Université Cadi Ayyad;Centre Régional de la Recherche Forestière Marrakech;Laboratoire de Biotechnologie et Physiologie Végétale, Faculté des Sciences Semlalia, Université Cadi Ayyad;Laboratoire de Biotechnologie et Valorisation des Ressources Naturelles, Faculté des Sciences, Université Ibn Zohr;Laboratoire de Biotechnologie Microbienne, Faculté des Sciences et Techniques, Université Sidi Mohamed Ben Abdellah;Laboratoire de Microbiologie et Biologie Moléculaire, Faculté des Sciences, Université Mohammed V Agdal

关键词: Argan tree;    drought stress;    oxidative stress;    rehydration;    tolerance;   

DOI  :  10.1080/17429145.2016.1148204

学科分类：纳米科学和纳米技术

来源: Taylor & Francis

【 摘 要 】

Our study was undertaken to ascertain whether the change of the water status and the activation of superoxide dismutase and their isoenzymes in Argan tree can support edaphic drought tolerance and its recovery under rehydration. An experiment was conducted on four contrasting ecotypes of Argania spinosa plants: two contrasting coastal ecotypes (Admine (Adm) and Rabia (Rab)) and two contrasting inland ecotypes (Aoulouz (Alz) and Lakhssas (Lks)). Drought stress significantly decreased the leaf water potential and stomatal conductance in the four contrasted ecotypes. In terms of biochemical responses, significant accumulation of carbonyl groups, hydrogen peroxide and superoxide radical has been recorded in the leaves of stressed plants reflecting oxidative stress. In parallel, the activities of total superoxide dismutase (SOD) and their isoenzymes Cu/Zn-SOD, Cu/Zn-SOD and Fe-SOD were also found to have increased to scavenging ROS and protecting the cell against induced oxidative stress. The recovery kinetics of A. spinosa , as a response to rehydration, were significant and rapid. According to the traits having the most discriminating power, both inland ecotypes (Lks and Alz) showed a better upregulation of its protective mechanisms compared to coastal ecotypes (Rab and Adm). All these adaptive traits make the inland ecotypes as an elite resource of drought tolerance and might become the new focus of domestication research of argan tree in arid and semi-arid environments.

【 授权许可】

CC BY|CC BY-NC