VvGA2ox8-Like from grape confers drought tolerance by activating the antioxidant defense system.
Yang W, Yang J, Lu S, Gou H, Wang N
Climate Adaptation
Grapevines in wine regions worldwide are already struggling with longer, hotter dry seasons — this discovery points toward a genetic pathway that could keep vineyards productive without extra irrigation.
Grapes have a gene that acts like a stress-response switch: when the plant senses drought, this gene dials down a growth hormone and ramps up the plant's internal cleanup crew — special proteins that neutralize the damaging byproducts of stress. Researchers tested this by artificially boosting the gene in Pinot Noir grape leaves and found the plants handled water shortage much better than normal. The gene also causes the plant to stockpile proline, a protective compound that acts like a cellular sponge to help cells hold their shape when water is scarce.
Key Findings
VvGA2ox8-Like expression is significantly induced by drought stress and works by catabolizing (breaking down) gibberellin hormones, reducing their levels in the plant.
Overexpression of VvGA2ox8-Like decreased hydrogen peroxide accumulation and increased antioxidant enzyme activity, lowering oxidative damage in grape leaves.
The gene interacts with VvGRX-S7 (a redox-regulating protein) and promotes proline accumulation and upregulation of stress-responsive genes, creating a multi-layered drought defense response.
chevron_right Technical Summary
Scientists identified a gene in grapevines that helps the plant survive drought by breaking down a growth hormone and boosting the plant's own antioxidant defenses. Overexpressing this gene reduced cellular damage and improved stress tolerance in Pinot Noir grapes.
Abstract Preview
VvGA2ox8-Like confers drought tolerance in grape by interacting with VvGRX-S7 for inhibited GA biosynthesis and upregulating antioxidant enzyme activities, proline accumulation, and stress-responsi...
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