ArticleFrontiers in plant science2026
Impact of cultivar on grapevine physiological adaptation to drought and subsequent rehydration.
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Introduction: Understanding grapevine responses to water deficit and rewatering is essential for developing adaptive strategies to mitigate the negative impacts of climate change in Mediterranean viticulture. Methods: This study evaluated the ecophysiological and biochemical behaviour of two emblematic Douro cultivars, Touriga Franca (TF) and Tinto Cão (TC), subjected to contrasting water regimes under potted controlled conditions. Physiological measurements of gas exchange, chlorophyll Results and discussion: TF exhibited moderate stomatal regulation, maintaining photosynthetic activity and high intrinsic water use efficiency during drought, as well as rapid recovery after rehydration. Conversely, TC showed a more conservative strategy, characterized by earlier stomatal closure, higher water retention (RWC > 90%), and increased accumulation of soluble proteins and phenolic compounds under stress. Both cultivars activated photoprotective mechanisms, with TF showing enhanced non-photochemical quenching and TC maintaining stable photosystem II efficiency. These findings highlight the contrasting strategies of TF (more anisohydric, plastic, and rapidly recoverable) and TC (more isohydric, conservative, and resilient), offering valuable insights for the selection of drought-tolerant cultivars and sustainable management of Douro vineyards under future warming and aridity scenarios.
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