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        Discovery of Stress Responsive TATA-box Binding Protein Associated Factor6 (TAF6) from Finger Millet (Eleusine coracana (L.) Gaertn)

        M. S. Parvathi,Karaba N. Nataraja 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4

        Drought is one of the major abiotic factors affectingplant growth mainly in the tropical regions. During stressacclimation response, basal transcriptional process is criticalwhich is coordinated by several cofactors, among which TATAboxBinding Protein (TBP) - Associated Factors (TAFs) are themajor proteins involved in pre-initiation complex assembly. Insearch of novel transcriptional regulators, we identified one ofthe factors, TAF6, in a drought cDNA library generated from anadapted crop, finger millet (Eleusine coracana (L.) Gaertn). RTPCRanalysis in leaf tissues of finger millet experiencingdifferent levels of drought, revealed its stress responsiveness inthree different genotypes. The gene is also induced under salt,osmotic and oxidative stresses at seedling stage. Analysis of itspromoter in model plants indicated the presence of cis-elementsassociated with diverse stress responses. Down regulation ofNbTAF6 by virus induced gene silencing (VIGS) approachresulted in a developmentally defective and stress sensitivephenotype in Nicotiana benthamiana. This is the first report onthe up-regulation of EcTAF6 under abiotic stresses and the geneprobably has a crucial role in safeguarding the stress relatedtranscription process. The basal regulators like TAF6 can thus beconsidered as prospective candidates associated with stressacclimation in plants.

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