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WRKY transcription factors are specifically involved in the transcriptional reprogramming following incidence of abiotic or biotic stress on plants. We have previously documented a novel  WRKY  gene from banana,  MusaWRKY71 , which was inducible in response to a wide array of abiotic or biotic stress stimuli. The present work details the effects of  MusaWRKY71  overexpression in transgenic banana plants. Stable integration and overexpression of  MusaWRKY71  in transgenic banana plants was proved by Southern blot analysis and quantitative real time PCR. Transgenic banana plants overexpressing  MusaWRKY71  displayed enhanced tolerance towards oxidative and salt stress as indicated by better photosynthesis efficiency (Fv/Fm) and lower membrane damage of the assayed leaves. Further, differential regulation of putative downstream genes of MusaWRKY71 was investigated using real-time RT-PCR expression analysis. Out of a total of 122 genes belonging to  WRKY ,  pathogenesis-related (PR) protein genes ,  non-expressor of pathogenesis-related genes 1  ( NPR1 ) and  chitinase  families analyzed, 10 genes (six belonging to  WRKY  family, three belonging to  PR proteins  family and one belonging to  chitinase  family) showed significant differential regulation in  MusaWRKY71  overexpressing lines. These results indicate that  MusaWRKY71  is an important constituent in the transcriptional reprogramming involved in diverse stress responses in banana.

MusaWRKY71 Overexpression in Banana Plants Leads to Altered Abiotic and Biotic Stress Responses