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The Role of Dreb2 Gene in Drought Tolerance of Common Wheat (Triticum Aestivum L.) Associated With Azospirillum Brasilense Publisher



Dehghani I1, 5 ; Mostajeran A2 ; Esmaeili A3 ; Ghannadian M4, 5
Authors
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Authors Affiliations
  1. 1. University of Isfahan, Plant Science Division, Department of Biology, Faculty of Science, Isfahan, Iran
  2. 2. University of Isfahan, Plant Science Division, Department of Biology, Faculty of Science Isfahan, Iran
  3. 3. University of Isfahan, Cell, Molecular Biology and Biochemistry Division, Department of Biology, Faculty of Sciences, Isfahan, Iran
  4. 4. Isfahan University of Medical Sciences, Isfahan Pharmaceutical Sciences Research Center, School of Pharmacy, Isfahan, Iran
  5. 5. Isfahan University of Medical Sciences, Department of Pharmacognosy, School of Pharmacy Isfahan, Iran

Source: Applied Ecology and Environmental Research Published:2019


Abstract

Dehydration causes loss of wheat (Triticum aestivum L.) yield. Inoculation of wheat with Azospirillum brasilense improves its tolerance to drought. Although up-regulation of DREB2 gene has increased drought tolerance of wheat, less information exists about DREB2 expression under inoculation with A. brasilense. In this study, the physiological responses of different pairs of six wheat cultivars with A. brasilense Sp7 and Sp245 strains were evaluated to drought and the tolerant (Roshan-Sp245), sensitive (Shahpasand-Sp7), moderately tolerant (Roshan-Sp7) and moderately sensitive pairs (Shahpasand-Sp245) were selected. Afterward, in the second experiment, DREB2 expression of the selected pairs was evaluated under inoculation and/or dehydration (ψ w = -90 MPa) at 0, 120 and 360 minutes. At 120 min, DREB2 expression was more in the tolerant and moderately tolerant pairs than others and also higher in inoculated and/or dehydration conditions. Root’s DREB2 was up-regulated almost 700-fold in the tolerant and moderately tolerant pairs under dehydration. In contrast, in the sensitive cv., DREB2 expression did not change due to dehydration or inoculation. This could be the effect of compatibility or homology of A. brasilense strains and wheat cultivars which affected DREB2 expression. Therefore, DREB2 expression had a significant effect on increased drought tolerance in tolerant and moderately tolerant pairs. © 2019, ALOKI Kft., Budapest, Hungary.
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