Integrated physiological, metabolic and molecular responses driving differential regulation of shared aluminum-resistance mechanisms in highbush blueberry.

Vaccinium corymbosum cultivar “Cargo” shows Al resistance by accumulating up to 18-fold more Al in roots than shoots while maintaining photosynthetic rate (−21% at 800 μM after 48 h).

• Why it matters: Aluminum toxicity limits productivity on ~30% of arable acidic soils, but woody species regulate conserved Al-resistance mechanisms differently across cultivars.
• What they did: One-year-old plants of “Cargo,” “Star,” and “Liberty” were hydroponically exposed to 0, 200, 400, or 800 μM AlCl3 (pH 4.5) for 0–48 h, measuring Al accumulation, gas exchange, antioxidant metrics, TCA-cycle enzymes (NAD-IDH, NAD-MDH), and VcMATE/VcALMT expression.
• The result: “Star” had −33% net photosynthesis and 2-fold lipid peroxidation, while “Liberty” was intermediate at 200–400 μM but showed the greatest net photosynthesis decline at 800 μM after 48 h; VcMATE was transiently repressed in all cultivars, with ~2-fold recovery at 48 h (400 μM) in “Liberty” but root-maintained suppression in “Cargo.”