Effects of exogenous nitric oxide on growth, proline accumulation and antioxidant capacity in Cakile maritima seedlings subjected to water deficit stress
Asma Jday A B , Kilani Ben Rejeb A B , Ines Slama A , Kaouthar Saadallah A B , Marianne Bordenave B , Séverine Planchais B , Arnould Savouré B and Chedly Abdelly A C
+ Author Affiliations
- Author Affiliations
A Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cedria (CBBC), BP 901, Hammam-Lif, 2050, Tunisia.
B Laboratoire d’Adaptation des Plantes aux Contraintes Environnementales, UR5, Université Pierre et Marie Curie (UPMC), Case 156, 4 Place Jussieu, 75252 Paris cedex 05, France.
C Corresponding author. Email: abdelly.chedly@gmail.com
Functional Plant Biology 43(10) 939-948 https://doi.org/10.1071/FP15363
Submitted: 24 November 2015 Accepted: 26 May 2016 Published: 21 July 2016
Abstract
Nitric oxide (NO) – an endogenous signalling molecule in plants and animals – mediates responses to biotic and abiotic stresses. In the present study, we examined the role of exogenous application of NO in mediating stress responses in Cakile maritima Scop. seedlings under water deficit stress using sodium nitroprusside (SNP) as NO donor and as a pre-treatment before the application of stress. Water deficit stress was applied by withholding water for 14 days. Growth, leaf water content (LWC), osmotic potential (ψs), chlorophyll, malondialdehyde (MDA), electrolyte leakage (EL), proline and Δ1-pyrroline-5-carboxylate synthetase (P5CS) and proline dehydrogenase (ProDH) protein levels were determined. Enzyme activities involved in antioxidant activities (superoxide dismutase (SOD) and catalase (CAT)) were measured upon withholding water. The results showed that shoot biomass production was significantly decreased in plants subjected to water deficit stress alone. However, in water deficit stressed plants pre-treated with SNP, growth activity was improved and proline accumulation was significantly increased. Proline accumulation was concomitant with the stimulation of its biosynthesis as shown by the accumulation of P5CS proteins. Nevertheless, no significant change in ProDH protein levels was observed. Besides plants showed lower water deficit-induced lipid membrane degradation and oxidative stress after the pretreatment with 100 µM SNP. This behaviour was related to the increased activity of SOD and CAT. Thus, we concluded that NO increased C. maritima drought tolerance and mitigated damage associated with water deficit stress by the regulation of proline metabolism and the reduction of oxidative damage.
Additional keywords: antioxidant enzymes, drought, proline metabolism.
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