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Background  Sweetpotato ( Ipomoea batatas  (L.) Lam.) serves as an important food source for human beings. β-galactosidase (bgal) is a glycosyl hydrolase involved in cell wall modification, which plays essential roles in plant development and environmental stress adaptation. However, the function of  bgal  genes in sweetpotato remains unclear.    Results  In this study, 17 β-galactosidase genes ( Ibbgal ) were identified in sweetpotato, which were classified into seven subfamilies using interspecific phylogenetic and comparative analysis. The promoter regions of  Ibbgal s harbored several stress, hormone and light responsive cis-acting elements. Quantitative real-time PCR results displayed that  Ibbgal  genes had the distinct expression patterns across different tissues and varieties. Moreover, the expression profiles under various hormonal treatments, abiotic and biotic stresses were highly divergent in leaves and root.    Conclusions  Taken together, these findings suggested that  Ibbgals  might play an important role in plant development and stress responses, which provided evidences for further study of bgal function and sweetpotato breeding.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12864-021-07436-1.

Genome-wide in silico identification and expression analysis of beta-galactosidase family members in sweetpotato [Ipomoea batatas (L.) Lam]