Overexpression of MusaSNAC1 improves shoot proliferation in transgenic banana lines

Augmenting shoot multiplication through genetic engineering is an emerging biotechnological application desirable in optimizing regeneration of genetically modified plants on selection medium and rapid clonal propagation of elite cultivars. Here, we report the improved shoot multiplication in transgenic banana lines with overexpression of MusaSNAC1 , a drought-associated NAC transcription factor in banana. Overexpression of MusaSNAC1 induces hypersensitivity of transgenic banana lines toward 6-benzylaminopurine ensuing higher shoot number on different concentrations of 6-benzylaminopurine. Altered transcript levels of multiple genes involved in auxin signaling ( Aux/IAA and ARFs ) and cytokinin signaling pathways ( ARRs ) in banana plants overexpressing MusaSNAC1 corroborate the hypersensitivity of transgenic banana plants toward 6-benzylaminopurine. Modulation in expression of ARRs reported to be involved in ABA-hypersensitivity and closure of stomatal aperture correlates with the function of MusaSNAC1 as a drought-responsive NAC transcription factor. Present study suggests a prospective cross talk between shoot multiplication and drought responses coordinated by MusaSNAC1 in banana plants.