Abstract
The present study examines the effect of cal- cium influx induced by the calcium ionophore (CI) on the biosynthesis of resveratrol and the expression of stilbene synthase (STS) and calcium-dependent protein kinase (CDPK) genes in cell cultures of Vitis amurensis, which have different levels of resveratrol production. The present study utilized the control cell culture V2 of V. amurensis, which contains no more than 0.02 % dry weight (DW) of resveratrol, in addition to rolB transgenic cell cultures VB1 and VB2, which have increased resveratrol contents (0.1-0.8 % DW). Treatment with the CI at a 1 lM con- centration significantly increased STS gene expression (6 of 10 analyzed STS genes) and resveratrol production in the control V2 cell culture by fourfold; however, use of the CI at 10 lM significantly decreased resveratrol production by 2-4 fold in all cell cultures tested. In the control V2 grape cell culture, treatment with the CI increased expression of all of the CDPK genes except VaCDPK1a and VaCDPK3a. In the rolB transgenic VB2 grape cell culture treated with the CI, we detected alterations in expression of several CDPK genes, but these changes in gene expression were not significant. Our results indicated that treatment with 1 lM of the CI increased resveratrol content and production in control grape cells by selectively increasing the expres- sion of STS genes. Conversely, the CI treatment did not significantly increase resveratrol content and production, or the expression of CDPK or STS genes in the rolB transgenic cells. Likely, untreated VB2 cells have increased concen- trations of cytoplasmic calcium, and therefore, treatment with the CI did not significantly change CDPK expression. These results suggest that the rolB gene has an important role in the regulation of calcium-dependent transduction pathways in transformed cells.
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