REGULATION OF CENTRAL METABOLISM IN THE LEAVES OF A GRAPE VINES VA- RIETAL COLLECTION ON A TEMPERATURE CLINE
Grape (Vitis vinifera) is one of the world’s oldest agricultural fruit crops, grown for wine, table grape, raisin, and other products. One of the factors that can cause a reduction in the grape growing area is temperature rise due to climate change. Elevated temperature causes changes in grapevine phenology and fruit chemical composition. Previous studies showed that grape varieties respond differently to a temperature shift of 1.5°C; few varieties had difficulties in the fruit development or could not reach the desired Brix level. In this study, six grapevine varieties (Syrah, Petit Syrah, Petit Verdot, Tempranillo, Sangiovese, and Pinot Noir), grown in Ramat Negev (30°58’43.4″N 34°42’31.6″E, 300 m asl and 79.4 mm rainfall) experimental vineyard showing different sugar accumulation patterns between temperature regimes were studied during a heatwave event. The physiological activities of these varieties were measured at three different times (7am, 12pm and 6 pm) during the heatwave. GC-MS based metabolite profiling and targeted transcript analysis were used to study the central metabolism in leaves in response to increasing temperature from morning to evening. Results showed that Pinot Noir had higher rates of transpiration, stomatal conductance and photosynthetic assimilation compared to Syrah. The metabolite profiling analysis revealed that the metabolic activity was generally higher in the morning for all varieties, decreasing during noon and evening. This research provides valuable insights into the impact of global warming on grapevine metabolism and the potential implications for wine production.
Issue: OENO Macrowine 2023
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Grape (Vitis vinifera), high temperature, metabolite, transcript proﬁling