Boron (B) is a very important nutrient required by forest plants; when supplied in adequate amounts, plants can ameliorate the negative effects of abiotic stresses. The objective of this study was to (i) investigate gas exchange, (ii) measure oxidant and antioxidant compounds, and (iii) respond how B supply acts on tolerance mechanism to water deficit in young Schizolobium parahyba plants. The experiment employed a factorial that was entirely randomised, with two boron levels (25 and 250 µmol L -1 , simulating conditions of sufficient B and high B, respectively) and two water conditions (control and water deficit). Water deficit induced negative modifications on net photosynthetic rate, stomatal conductance and water use efficiency, while B high promoted intensification of the effects on stomatal conductance and water use efficiency. Hydrogen peroxide and electrolyte leakage of both tissues suffered non-significant increases after B high and when applied water deficit. Ascorbate levels presented increases after water deficit and B high to leaf and root. Our results suggested that the tolerance mechanism to water deficit in young Schizolobium parahyba plants is coupled to increases in total glutathione and ascorbate aiming to control the overproduction of hydrogen peroxide and alleviates the negative consequences on electrolyte leakage and gas exchange. In relation to B supply, this study proved that sufficient level promoted better responses under control and water deficit conditions.
Boron (B) supply has been studied as an alternative to alleviate environmental stress conditions in forest essences due to the functions that B plays within the plant cell in the metabolism of compounds and polysaccharides connection. Thus, it was postulated the hypothesis that B may provide greater resistance from Paricá (Schizolobium parahyba) to water deficit. The aim was to evaluate growth parameters, photosynthetic rate, nutritional efficiencies, and B content of young Schizolobium parahyba plants as a function of the factors B levels and water deficit. Experiment was a completely randomized factorial, with two B concentrations (25 and 250 μmol L-1 , simulating sufficient and high B conditions, respectively) and two water conditions (deficit and no deficit). Factors analyzed influenced growth, accumulation, photosynthetic and nutritional efficiency variables. There was an increase in the growth of stem, root and in the Dickson quality index of plants of Paricá with high concentration of B, when they were under water deficit. Concentration and accumulation of B was higher in plants under water deficit with high concentration of B, as well as the efficiency of absorption and translocation, indicating that high B nutrition attenuates the effect of water deficit in young plants in Paricá.
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