Abstract
The objective of this study was to clarify the effects of calcium treatments on the anthocyanin accumulation of ‘Manicure Finger’ grape berries. Calcium treatments increased the calcium contents and enhanced the calmodulin activities in grapevine leaves and berries, upregulated the expression of the sugar transporter genes SUC12 and SUC27 in leaves, promoted the transport of photosynthetic products to berries, and increased the expression of anthocyanin biosynthesis-related genes in the grape berry skin. These results indicate that the application of exogenous calcium enhances anthocyanin accumulation in ‘Manicure Finger’ grape berries in the following two ways: (1) calcium promotes the transport of photosynthetic products to berries, thereby providing the basic material required for anthocyanin biosynthesis; (2) calcium induces anthocyanin biosynthesis by regulating the expression of relevant structural and regulatory genes. Our results will help researchers characterize the mechanism responsible for the calcium-mediated promotion of anthocyanin biosynthesis in grapevine and related plant species.
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