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Dehydrins belong to a protein family whose expression may be induced or enhanced by developmental process and environmental stresses that lead to cell dehydration. A dehydrin gene named  OesDHN  was isolated and characterized from  oleaster  ( Olea europaea  L. subsp.  europaea , var.  sylvestris ), the wild form of olive. To elucidate the contribution of  OesDHN  in the development of drought tolerance, its expression levels were investigated in  oleaster  plants during development and under drought stress condition. The involvement of  OesDHN  in plant stress response was also evaluated in  Arabidopsis  transgenic lines, engineered to overexpress this gene, and exposed to a controlled mild osmotic stress.  OesDHN  expression was found to be modulated during development and induced under mild drought stress in  oleaster  plants. In addition, the  Arabidopsis  transgenic plants showed a better tolerance to osmotic stress than wild-type plants. The results demonstrated that  Oes DHN expression is induced by drought stress and is able to confer osmotic stress tolerance. We suggest a role for  OesDHN , as a putative functional marker of plant stress tolerance.

A dehydrin gene isolated from feral olive enhances drought tolerance in Arabidopsis transgenic plants