From definition to discovery: metabolite markers of high temperature in green grape berries
Zhan, X.; Mauve, C.; Lecourieux, F.; Gomes, E.; Chavonet, E.; Fonayet, J. V.; Gakiere, B.; Abadie, C.; Petriacq, P.; Lecourieux, D.
Climate Adaptation
Wine grapes stressed by summer heat waves during their green, unripe phase are already on a compromised trajectory months before harvest — and now there are measurable chemical signals that could let growers intervene earlier.
When grape berries are young and still green, a heat wave quietly reshuffles their internal chemistry in ways that shape what the final wine will taste like. Researchers tested two popular wine grape varieties under controlled heat and found a handful of molecules that reliably spike or crash under heat — some shared between varieties, others unique to each. These chemical fingerprints could one day help farmers detect heat damage early, before it's visible on the vine.
Key Findings
Glycine (an amino acid) consistently decreased and galactinol (a protective sugar) consistently increased under heat stress in both Cabernet Sauvignon and Merlot, making them reliable cross-cultivar heat markers.
Five additional metabolites — xylose, lyxose, citrulline, quinic acid, and glutamine — varied between the two cultivars under heat, revealing that grape varieties respond to heat stress in chemically distinct ways.
Xylose, lyxose, citrulline, and quinic acid also differed between the two cultivars under normal temperatures, suggesting these molecules may serve as stable chemical identifiers of cultivar identity regardless of stress.
chevron_right Technical Summary
Scientists discovered specific chemical markers that reliably indicate heat stress in unripe wine grapes, finding that one amino acid (glycine) drops while a protective sugar (galactinol) rises across both Cabernet Sauvignon and Merlot when temperatures spike.
Abstract Preview
Understanding how plants respond to high temperature is critical under global warming. Metabolite markers can provide insights into stress-responsive mechanisms and help guide strategies to maintai...
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Cabernet Sauvignon is one of the world's most widely recognized red wine grape varieties. It is grown in nearly every major wine producing country among a diverse spectrum of climates from Australia and British Columbia, Canada to Lebanon's Beqaa Valley.