Identification of a putative Solanum tuberosum transcriptional coactivatorup-regulated in potato tubers by Fusarium solani f. sp eumartii infection and wounding

Coadaptors or coactivators are a new class of transcription factors capable of interconnecting a regulator DNA-binding protein with a component of the basal transcription machinery allowing transcriptional activation to proce ed. We report the identification of a novel Solanum tuberosum ssp. tuberosu m putative transcription coactivator, named StMBF1 (Solanum tuberosum multi protein bridging factor 1). The StMBF1 cDNA was isolated from a Furarium so lani f. sp. eumartii-infected potato tuber cDNA library, using a differenti al screening approach. StMBF1 is up-regulated during fungal attack as well as on wounding. A Fusarium elicitor source and ethylene precursor and salic ylic acid also regulate StMBF1 expression. The precise role of StMBF1 durin g the plant response against environmental stresses remains to be elucidate d.