Expression of VvSK1 in various tissues from Cabernet Sauvignon plants. Expression of VvSK1 mRNA was determined by semiquantitative RT-PCR, and elongation factor VvEF1 was used as an internal control. A, VvSK1 expression in roots, stems, leaves, inflorescences, and mature berries. B, Expression of VvSK1 in developing berries at 3 weeks (P3), 7 weeks (P7), 9 weeks (P9), 11 weeks (P11), and 15 weeks (P15) post flowering. C, Expression of VvSK1 in berry skin, pulp, and seed at véraison stage. The experiment was repeated three times independently with similar results.