Gas exchange and carbon metabolism in leaves of crabwood ('Carapa guianensis' Aubl.) in three mechanisms and suspension of water stress

Crabwood or Andiroba (in Brazil) is an arboreal species with variations in their physiological processes from soil and climatic conditions induced, such as lack or excess water. The objective of this study was to evaluate the effects of drought and flooding in gas exchange, abscisic acid, starch, total soluble carbohydrates, sucrose in Andiroba leaves with seven months of age and resilience of these young plants after cessation of stress. The experiment was conducted in a greenhouse. The experimental design was completely randomized in a factorial 3x5 (three water conditions: control, water deficit and flooding and 5 periods reviewed. 0, 10, 20, 30 and suspension of water stress after 72h) with 5 repetitions, totaling 75 sample units. Significant decreases were observed in water potential, stomatal conductance, transpiration and starch content, and significant increase in abscisic acid (ABA) content, total soluble carbohydrates and sucrose, with significant values on the 30th day of the experiment. After the water stress, the plants failed to recover the initial values of all variables, recovering only the sucrose levels. Andiroba is satisfactorily tolerant to water stress imposed in this experiment, but does not show a rapid recovery after the suspension of water stress, with higher sensitivity to water stress.