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Plant-specific YABBY (YAB) transcription factors play multiple roles in plant growth and development process. However, no comprehensive study has been performed in grapevines, especially to determine their roles in berry development and abiotic stress response. A total of seven  VviYABs  allocated to six chromosomal positions in grapevines were identified and classified into five subfamilies based on phylogenetic and structural analysis. Promoter element analysis and tissue-specific transcriptional response of  VviYABs  suggested that  VviYABs  might play vital roles in plant growth and development.  VviYAB1 ,  2 ,  3 , and  5  showed significantly higher expression levels in vegetative/green organs than in mature/woody tissues, implying that  VviYABs  might be involved in the regulatory switch from immature to mature developmental phases. The expression of  VviYAB1 , 2, 3, and  VviFAS  were gradually downregulated during berry developmental and ripening, which can be considered as putative molecular biomarkers between vegetative/green and mature/woody samples, and were used to identify key developmental and metabolic processes in grapevines. Furthermore,  VviYAB1  expression was not markedly increased by gibberellic acid (GA 3 ) treatment alone, but displayed significant upregulation when GA 3  in combination with N-(2-chloro-4-pyridyl)-N′-phenylurea (CPPU) were applied, suggesting an involvement of  VviYAB1  in fruit expansion by mediating cytokinin signaling pathway. Additionally, microarray and RNA-seq data suggested that  VviYABs  showed transcriptional regulation in response to various abiotic and biotic stresses, including salt, drought,  Bois Noir ,  Erysiphe necator , and GLRaV-3 infection. Overall, our results provide a better understanding of the classification and functions of  VviYABs  during berry development and in response to abiotic and biotic stresses in grapevines.

frontiers in genetics

Genome-Wide Identification and Expression Analysis of VviYABs Family Reveal Its Potential Functions in the Developmental Switch and Stresses Response During Grapevine Development