Comparison of full-length and conserved segments of wheat dehydrin DHN-5 overexpressed in Arabidopsis thaliana showed different responses to abiotic and biotic stress
Marwa Drira A , Moez Hanin A , Khaled Masmoudi A B and Faiçal Brini A C
+ Author Affiliations
- Author Affiliations
A Biotechnology and Plant Improvement Laboratory, Centre of Biotechnology of Sfax, University of Sfax, BP 1177, 3018, Sfax, Tunisia.
B Present address: International Center for Biosaline Agriculture, PO Box 14660, Dubai, United Arab Emirates.
C Corresponding author. Email: faical.brini@cbs.rnrt.tn
Functional Plant Biology 43(11) 1048-1060 https://doi.org/10.1071/FP16134
Submitted: 8 April 2016 Accepted: 6 July 2016 Published: 19 August 2016
Abstract
Dehydrins (DHNs) are among the most common proteins accumulated in plants under water-related stress. They typically contain at least three conserved sequences designated as the Y-, S- and K-segments. The present work aims to highlight the role of the K-segments in plant tolerance to biotic and abiotic stresses. For this purpose, transgenic Arabidopsis thaliana (L.) Heyhn. lines expressing distinct wheat (Triticum aestivum L.) DHN-5 truncated constructs with or without the K-segments were generated. Our results showed that unlike the derivative lacking a K-segment, constructs containing only one or two K-segments enhanced the tolerance of A. thaliana to diverse stresses and were similar to the full-length wheat DHN-5. Moreover, compared with the wild-type and the YS form, the transgenic plants overexpressing wheat DHN-5 with K-segments maintained higher superoxide dismutase, catalase and peroxide dismutase enzymatic activity, and accumulated lower levels of H2O2 and malondialdehyde. In addition, we demonstrated that lines like A. thaliana overexpressing wheat DHN-5 showed increased resistance to fungal infections caused by Botrytis cinerea and Alternaria solani. Finally, the overexpression of the different forms of wheat DHN-5 led to the regulation of the expression of several genes involved in the jasmonic acid signalling pathway.
Additional keywords: K-segments, salt stress, transgenic plants, water stress.
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