Metabolomic analyses of highbush blueberry (Vaccinium corymbosum L.) cultivars revealed mechanisms of resistance to aluminum toxicity

•Ascorbic acid content is increased in roots of the Al-resistant cultivars under Al treatment.•Aluminum treatment increased the exudation of oxalic acid in Al-resistant cultivars.•The NADP-MDH activation state is increased for the effect of the aluminum in roots and leaves of Al-resistant cultivars.•Aluminum affects the expression levels of enzymes of the TCA cycle in cultivars of highbush blueberry.