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Iranian Journal of Biotechnology، جلد ۱۶، شماره ۲، صفحات ۱۲۰-۱۳۱
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عنوان انگلیسی Monitoring Response of a Few bZip Transcription Factors in Response to Osmotic Stress in Sunflower
چکیده انگلیسی مقاله 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.Objective: The expression pattern of some bZip transcription factors in response to osmotic stress was investigated in sunflower.Material and Methods: Employing real-time PCR to monitor, the response of 10 bZIP transcription factors was performed under different osmotic stress conditions including -0.3, 0.9, and 1.2 MPa. Whole seedling was sampled at 6, 12, and 24 h after the osmotic condition application.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 genes, two with a possible effect on responsiveness of drought sensitive line were identified.Conclusions: It was a focus to have systemic view on the complex response of the plant to abiotic stress, and avoidance of the single gene analysis. Also, the importance of molecular data in molecular breeding procedures toward achievement of the stress tolerant lines was highlighted.
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نویسندگان مقاله Zeinab Esmailzadeh mianlengeh |
Department of Plant Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, G.C, Tehran, Iran.

Masood Soltani |
Seed and Plant Improvement Institue (SPII)

Abbas Saidi |
Department of Plant Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, G.C, Tehran, Iran.

Hossein Askari |
Department of Plant Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, G.C, Tehran, Iran.

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