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Since water is fundamental to plants, any restriction may affect growth, development and production of crops. This study aimed at evaluating leaf growth, transpiration and stomatal conductance of orange trees cv. Jaffa orange trees (Citrus sinensis L.) regarding their fraction of transpirable soil water when they encountered water deficit. The experiment was carried out in a greenhouse and one plant per pot. The experimental design was a completely randomized design with two water conditions (with and without water deficit) for twenty days, with fifteen replications per treatment. Relative transpiration, relative leaf growth, stomatal conductance of water vapor and leaf transpiration were evaluated. Analysis of variance and adjustment of logistic regression were carried out by the R Program. Plants were submitted to irrigation had higher transpiration rates and stomatal conductance than non-irrigated plants for twenty days. In orange trees, the fraction of water which was available in the soil and critical for transpiration was 0.90, whereas for leaf growth, it was 0.65. We concluded that this orange tree is resistant to water deficiency due to reduction of transpiration before leaf growth stage to better manage the available water in the soil.

Morpho-physiological characteristics of Jaffa orange trees (Citrus sinensis L.) in response to soil water deficit