Dynamic responses of photosynthesis and the antioxidant system during a drought and rehydration cycle in peanut plants
Ana Furlan A B C , Eliana Bianucci A , María del Carmen Tordable A , Aleysia Kleinert B , Alexander Valentine B and Stella Castro A
+ Author Affiliations
- Author Affiliations
A Departamento de Ciencias Naturales, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36, Km. 601, 5800 Río Cuarto, Córdoba, Argentina.
B Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Stellenbosch 7602, South Africa.
C Corresponding author. Email: afurlan@exa.unrc.edu.ar
Functional Plant Biology 43(4) 337-345 https://doi.org/10.1071/FP15206
Submitted: 23 July 2015 Accepted: 30 November 2015 Published: 1 February 2016
Abstract
Drought stress is one of the most important environmental factors that adversely affect the productivity and quality of crops. Most studies focus on elucidating plant responses to this stress but the reversibility of these effects is less known. The aim of this work was to evaluate whether drought-stressed peanut (Arachis hypogaea L.) plants were capable of recovering their metabolism upon rehydration, with a focus on their antioxidant system. Peanut plants in the flowering phase (30 days after sowing) were exposed to drought stress by withholding irrigation during 14 days and subsequent rehydration during 3 days. Under these conditions, physiological status indicators, reactive oxygen species production and antioxidant system activity were evaluated. Under drought stress, the stomatal conductance, photosynthetic quantum yield and 13C : 12C ratio of the peanut plants were negatively affected, and also they accumulated reactive oxygen species. The antioxidant system of peanut plants showed increases in superoxide dismutase-, ascorbate peroxidase- and glutathione reductase-specific activities, as well as the total ascorbate content. All of these responses were reversed upon rehydration at 3 days. The efficient and dynamic regulation of variables related to photosynthesis and the antioxidant system during a drought and rehydration cycle in peanut plants was demonstrated. It is suggested that the activation of the antioxidant system could mediate the signalling of drought stress responses that enable the plant to survive and recover completely within 3 days of rehydration.
Additional keywords: ascorbate, Arachis hypogaea L., reactive oxygen species, water stress.
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