Iranian Journal of Biotechnology 2018-May
Monitoring Response of a Few bZip Transcription Factors in Response to Osmotic Stress in Sunflower.
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Background
Sunflower (Helianthus annuus L.) is one of the important vegetable oil supplies in the world and in Iran, as well. It is classified as a drought semi-tolerant crop; however, its yield is adversely affected by drought stress. Understanding the initial events in sensing stress and the related physiologic and biochemical events thereafter, is crucial in designing drought stress breeding programs. Transcription factors are master molecules directly involved in the plant responses under drought stress, from signal perception and transduction to the regulation of physiologic processes.Results
Exposure to osmotic potential of 0.9 MPa for 24 h caused a reduction in the fresh weight of the seedling. Among the evaluated genes, eight genes, bz-497, bz-502, bz-485, bz-499, bz-492, bz-504, bz-505, and bz-509 appeared as the osmotic stress responsive transcription factor. Changes in the expression of the genes under 0.3 MPa was observed for four genes. Most of the osmotic responsive genes appeared to be up-regulated. Most of responsiveness in the gene expression was happened under 0.9 MPa of the osmotic stress which is corresponding to fresh weight reduction in the seedlings. Among the investigated genes, two genes was identified to have possible roles in sensitive response of sunflower against drought stress.