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Comparative Analysis of WRKY Genes Potentially Involved in Salt Stress Responses in Triticum turgidum L. ssp. durum

Yousfi, Fatma-Ezzahra and Makhloufi, Emna and Marande, William and Ghorbel, Abdelwahed and Bouzayen, Mondher and Berges, Hélène Comparative Analysis of WRKY Genes Potentially Involved in Salt Stress Responses in Triticum turgidum L. ssp. durum. (2017) Frontiers in Plant Science, 7 (2034). ISSN 1664-462X

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Official URL: http://dx.doi.org/10.3389/fpls.2016.02034

Abstract

WRKY transcription factors are involved in multiple aspects of plant growth, development and responses to biotic stresses. Although they have been found to play roles in regulating plant responses to environmental stresses, these roles still need to be explored, especially those pertaining to crops. Durum wheat is the second most widely produced cereal in the world. Complex, large and unsequenced genomes, in addition to a lack of genomic resources, hinder the molecular characterization of tolerance mechanisms. This paper describes the isolation and characterization of five TdWRKY genes from durum wheat(TriticumturgidumL.ssp.durum).APCR-based screening of aT.turgidum BAC genomic library using primers within the conserved region of WRKY genes resulted in the isolation of five BAC clones. Following sequencing fully the five BACs, fine annotation through Triannot pipeline revealed 74.6% of the entire sequences as transposable elements and a 3.2% gene content with genes organized as islands with in oceans of TEs. Each BAC clone harbored a TdWRKY gene .The study showed a very extensive conservation of genomic structure between TdWRKYs and their orthologs from Brachypodium, barley, and T. aestivum. The structural features of TdWRKY proteins suggested that they are novel members of the WRKY family in durum wheat. TdWRKY1/2/4 , TdWRKY3, and TdWRKY5 belong to the group Ia, IIa, andIIc, respectively. Enrichmentofcis- regulatory elements related to stress responses in the promoters of some TdWRKY genes indicated their potential roles inmediating plant responses to a wide variety of environmental stresses. TdWRKY genes displayed different expression patterns in response to salt stress that distinguishes two durum wheat genotypes with contrasting salt stress tolerance phenotypes. TdWRKY genes tended to react earlier with a down-regulation in sensitive genotype leaves and with an up-regulation intolerant genotype leaves. The TdWRKY transcripts levels in roots increased intolerant genotype compared to sensitive genotype. The present results indicate that these genes might play some functional role in the salt tolerance in durum wheat.

Item Type:Article
Additional Information:Thanks to Frontiers Media editor. The definitive version is available at http://journal.frontiersin.org/article/10.3389/fpls.2016.02034/full
HAL Id:hal-01490977
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Centre de Biotechnologie de Borj Cédria - CBBC (TUNISIA)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
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Deposited On:16 Mar 2017 10:16

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