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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Abscisic acid signals reorientation of polyamine metabolism to orchestrate stress responses via the polyamine exodus pathway in grapevine
Journal of Plant Physiology, Volume 167, No. 7, Year 2010
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Description
Polyamines (PAs) have been suggested to be implicated in plant responses to abiotic and biotic stress. Grapevine is a model perennial plant species whose cultivars respond differently to osmotic stress. In this study, we used two cultivars, one sensitive (S) and one tolerant (T) to drought. In adult vines subjected to drought under greenhouse conditions, total PAs were significantly lower in the control T- and higher in the control S-genotype and significantly increased or decreased, respectively, post-treatment. Soluble Put and Spd exhibited the greatest increase on d 8 post-treatment in the T- but not in the S-genotype, which accumulated soluble Spm. Abscisic acid (ABA) was differentially accumulated in T- and S-genotypes under drought conditions, and activated the PA biosynthetic pathway, which in turn was correlated with the differential increases in PA titers. In parallel, polyamine oxidases (PAOs) increased primarily in the S-genotype. ABA at least partially induced PA accumulation and exodus into the apoplast, where they were oxidized by the apoplastic amine oxidases (AOs), producing H2O2, which signaled secondary stress responses. The results here show that the ABA signaling pathway integrates PAs and AOs to regulate the generation of H2O2, which signals further stress responses or the PCD syndrome. © 2009 Elsevier GmbH. All rights reserved.
Authors & Co-Authors
Toumi, Imen
Greece, Rethymnon
University of Crete
Tunisia, Tunis
Université de Tunis
Moschou, Panagiotis N.
Greece, Rethymnon
University of Crete
Paschalidis, Konstantinos A.
Greece, Rethymnon
University of Crete
Bouamama, Badra
Tunisia, Tunis
Université de Tunis
Ben Salem-Fnayou, Asma
Tunisia, Tunis
Université de Tunis
Ghorbel, Abdelwahed
Tunisia, Tunis
Université de Tunis
Mliki, A.
Tunisia, Tunis
Université de Tunis
Roubelakis-Angelakis, K. A.
Greece, Rethymnon
University of Crete
Statistics
Citations: 136
Authors: 8
Affiliations: 2
Identifiers
Doi:
10.1016/j.jplph.2009.10.022
ISSN:
01761617
Research Areas
Genetics And Genomics