Contrasting seasonal dynamics of dormancy, respiratory metabolism and cell cycle state in grapevine buds of a subtropical and Mediterranean climate

Abstract Grapevine ( Vitis vinifera L.) is the most widely cultivated fruit crop worldwide, contributing substantially to rural economies. The production cycle and productivity depend on seasonal cues can range from a strongly deciduous habit in cool‐temperate climates evergreen subtropical tropical climates. influence of different conditions dynamics perennating bud, including degree growth metabolic quiescence, cell status internal tissue oxygen between climatic zones largely unknown. This knowledge important for adapting changing climate expansion wider regions. study investigated physiology bud commercially grown cv. Flame Seedless table grapes Mediterranean Western Australia, summer until late winter. Climate data were obtained, showing differences minimum (night) temperature two climates, reflected by calculated chilling units. Bud dormancy increased during autumn both climates;however, onset depth buds region attenuated relative condition. Stark contrasts also observed metabolism. respiration subtropical‐grown over fivefold winter, while that Mediterranean‐grown less than twofold. was desiccation buds, an apparently greater hypoxia within prior burst. Collectively, these show pronounced grapes, which provide foundation investigating differing seasonality how may be managed through breeding agronomy.