Transcriptional Insights Suggest Altered Ripening Progression and Sugar Regulation in Japanese Indigenous Wine Grape Vitis sp. cv. Koshu.

ABSTRACT: Vitis sp. cv. Koshu is an important Japanese indigenous wine grape cultivar. However, it possesses challenging traits for winemaking, including large berries and low sugar content. To explore the transcriptional profile associated with these characteristics, we conducted a comparative transcriptome analysis of the berry flesh of Koshu and Chardonnay at 10 days after the onset of véraison. A total of 5534 differentially expressed genes were identified, revealing a distinct transcriptional profile in Koshu. The expression patterns in Koshu suggest an altered ripening progression, characterized by the marked downregulation of the ripening marker Grape Ripening-Induced Protein 22-like (GRIP22-like) and the upregulation of photosynthesis-related genes. Despite its large-ber

SUBMITTER: Hayashi N 

PROVIDER: S-EPMC12842192 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature