A probable model for regulatory network being involved in drought responses in tobacco roots. The integrated gene regulatory network has been proposed on basis of previous regulatory network model of Arabidopsis in the drought and cold stress responses. Abbreviations: ABA, abscisic acid; NCED, 9-cis-epoxycarotenoid dioxygenase gene; SnRK2.6, SNF1-related protein kinase2.6/OST1 kinase; NAC, NAM, ATAF, and CUC transcription factor; bZIP, basic-domain leucine-zipper; ABF, ABRE-binding factor; AREB, ABA-responsive-element-binding protein; ERF, ethylene-responsive-element-binding factor; DRE, dehydration-responsive element; DREB, DRE-binding factor; DREB1B, DREB2A, DREB3 and GmERF3 are the members of ERF family.