Tolerância de mudas de mangueira à restrição hídrica

Abstract

Although mango trees be considered drought tolerant, young plants of this species are particularly vulnerable to water deficit. This study aimed to verify the influence of the water conditions of culture in grafted seedlings and nografted and the correlation between the studied variables. Thus, they were evaluated, for two cycles of water restriction and re-watering of the plants, the relative water content, the SPAD index, the stomatal conductance, the photosynthetic rate, and initial and final leaf number in each cycle. There was significant difference between the seedlings for leaf number, SPAD index, stomatal conductance and photosynthetic rate, independently of the water condition which the plants had been submitted. The water restriction statistically influenced the stomatical conductance and the photosynthetic rate independently of the type of seedlings used. During the evaluation days the seedlings did not present difference between the water conditions for the studied variable. The photosynthetic rate present high and significant correlation with the stomatical conductance for the studied mango seedlings.