Leaf seasonal osmotic adjustment is not driven by temperature or water deficit.

ABSTRACT: Osmotic adjustment (OA), the active accumulation of osmolytes in plant cells, plays a crucial role in plant-drought response. OA occurs throughout the growing season, but the seasonal effects of temperature and water status on OA remain unclear. We investigated grapevine (Vitis vinifera) leaves' regulation of osmotic potential over time, across different temperatures and water deficit conditions and the contributions of sugars and cations driving these changes. Potted grapevines were grown under greenhouse-controlled conditions at 20, 25 and 30°C, with half of the vines being exposed to mild water deficit (ca. -1 MPa) for 35 days. Leaf osmotic potential at full turgor (π₁₀₀) was measured via osmometer, while sugar and cation concentrations were quantified by HPIC. Furthermore, π

SUBMITTER: Farolfi E 

PROVIDER: S-EPMC12617389 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature