NCED expression is related to increased ABA biosynthesis and stomatal closure under aluminum stress

Aluminum (Al)-induced decrease in leaf hydration has been associated with low gas exchange, especially stomatal conductance (gs). However, the mechanisms explaining these responses are unclear. Citrus limonia was exposed to 0 and 1480 μM Al nutrient solution for 90 days test whether gs plants is increased 9-cis-epoxycarotenoid dioxygenase (NCED) gene expression abscisic acid (ABA) biosynthesis. Relative water content (RWC), potential (Ψw) exchange leaves, as well root ClNCED3, ClNCED1 ClNCED5 accumulation of ABA its metabolites (phaseic acid, dihydrophaseic (+)-7′-hydroxy-ABA ABA-β-d-glucosyl ester) were measured. up-regulated ClNCED3 induced roots before impairments status (low Ψw, RWC gs) could be observed. Leaf concentration from 7 this partially explained by up-regulation organ. Stomatal closure occurred concomitantly increase concentration, result provides further evidence role modulation plant under stress.