Abstract
Although beta-glucosidase was recently demonstrated to be involved at transcriptional level in fleshy fruit development, it remains unclear whether BG possesses biochemical activity. In the present study, real-time reverse transcription polymerase chain reaction analysis showed that the mRNA expression levels of β-glucosidase gene VvBG1 increased rapidly concomitant with berry red-colouring in Muscat Hamburg grapevine (Vitis vinifera), suggesting that the VvBG1 gene might be involved in the berry ripening. In order to explore VvBG1 biochemical activity, a 60-kD recombinant protein, VvBG1, was expressed in Escherichia coli BL21 (DE3) and purified. The results gained from a combination of VvBG1-pulp-homogeneity-incubation test and gas chromatography-mass spectroscopy analysis showed that VvBG1-treated berry samples contained more free ABA than the control, demonstrating that VvBG1 has high glycosyl hydrolase activity that can transform the ABA-glucosyl ester to free ABA. In conclusion, both the high expression and increased hydrolase activity of VvBG1 could suggest an important role of ABA in grape berry ripening.
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Abbreviations
- ABA:
-
Abscisic acid
- ABA-GE:
-
ABA glucosyl ester
- NCED:
-
9-cis-Epoxycarotenoid dioxygenase
- BG:
-
Beta-glucosidase
- CYP:
-
ABA 8′-hydroxylase
- GT:
-
ABA glucosyltransferase
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Acknowledgments
This work was supported financially by the National Key Basic Research ‘973’ Program of China (grant no. 2012CB126306), the National Science Foundation of China (grant no 31272144), and the Project of Construction of Innovative Teams and Teacher Career Development for Universities and Colleges under Beijing Municipality (grant no. IDHT20140509).
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Sun, Jh., Dong, Yh., Li, Cl. et al. Transcription and enzymatic analysis of beta-glucosidase VvBG1 in grape berry ripening. Plant Growth Regul 75, 67–73 (2015). https://doi.org/10.1007/s10725-014-9932-x
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DOI: https://doi.org/10.1007/s10725-014-9932-x