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Title: Alternative oxidase 1 (Aox1) gene expression in roots of Medicago truncatula is a genotype-specific component of salt stress tolerance
Authors: Mhadhbi, Haythem 
Fotopoulos, Vasileios 
Mylona, Photini V. 
Jebara, Moez 
Mohamed, Elarbi Aouani 
Polidoros, Alexios N. 
Major Field of Science: Natural Sciences
Field Category: Biological Sciences
Keywords: Gene expression;Alternative oxidase;Functional markers;Medicago truncatula;Salt stress;Tolerance behaviour
Issue Date: 1-Jan-2013
Source: Journal of Plant Physiology, 2013, vol. 170, no.1, pp. 111–114
Volume: 170
Issue: 1
Start page: 111
End page: 114
Journal: Journal of Plant Physiology 
Abstract: Alternative oxidase (AOX) is the central component of the non-phosphorylating alternative respiratory pathway in plants and may be important for mitochondrial function during environmental stresses. Recently it has been proposed that Aox can be used as a functional marker for breeding stress tolerant plant varieties. This requires characterization of Aox alleles in plants with different degree of tolerance in a certain stress, affecting plant phenotype in a recognizable way. In this study we examined Aox1 gene expression levels in Medicago truncatula genotypes differing in salt stress tolerance, in order to uncover any correlation between Aox expression and tolerance to salt stress. Results demonstrated a specific induction of Aox1 gene expression in roots of the tolerant genotype that presented the lowest modulation in phenotypic and biochemical stress indices such as morphologic changes, protein level, lipid peroxidation and ROS generation. Similarly, in a previous study we reported that induction of antioxidant gene expression in the tolerant genotype contributed to the support of the antioxidant cellular machinery and stress tolerance. Correlation between expression patterns of the two groups of genes was revealed mainly in 48 h treated roots. Taken together, results from both experiments suggest that M. truncatula tolerance to salt stress may in part due to an efficient control of oxidative balance thanks to (i) induction of antioxidant systems and (ii) involvement of the AOX pathway. This reinforces the conclusion that differences in antioxidant mechanisms can be essential for salt stress tolerance in M. truncatula and possibly the corresponding genes, especially Aox, could be utilized as functional marker.
ISSN: 1618-1328
DOI: 10.1016/j.jplph.2012.08.017
Rights: © Elsevier
Type: Article
Affiliation : Laboratory of Legumes 
Agricultural Recearch Center of Northern Greece 
Aristotle University of Thessaloniki 
Cyprus University of Technology 
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