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Background  Under drought, plants accumulate the signaling hormone abscisic acid (ABA), which induces the rapid closure of stomatal pores to prevent water loss. This event is trigged by a series of signals produced inside guard cells which finally reduce their turgor. Many of these events are tightly regulated at the transcriptional level, including the control exerted by MYB proteins. In a previous study, while identifying the grapevine R2R3 MYB family, two closely related genes,  VvMYB30  and  VvMYB60  were found with high similarity to  AtMYB60 , an Arabidopsis guard cell-related drought responsive gene.    Results  Promoter-GUS transcriptional fusion assays showed that expression of  VvMYB60  was restricted to stomatal guard cells and was attenuated in response to ABA. Unlike  VvMYB30 ,  VvMYB60  was able to complement the loss-of-function  atmyb60-1  mutant, indicating that  VvMYB60  is the only true ortholog of  AtMYB60  in the grape genome. In addition,  VvMYB60  was differentially regulated during development of grape organs and in response to ABA and drought-related stress conditions.    Conclusions  These results show that VvMYB60 modulates physiological responses in guard cells, leading to the possibility of engineering stomatal conductance in grapevine, reducing water loss and helping this species to tolerate drought under extreme climatic conditions.

bmc plant biology

The grapevine guard cell-related VvMYB60 transcription factor is involved in the regulation of stomatal activity and is differentially expressed in response to ABA and osmotic stress