Abstract
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.
Highlights
IntroductionDucke) Barneby, is a forest species of Amazonian origin, which stands out in forestry and agroforestry plantations (Ohashi et al, 2010)
The Paricá plant, Schizolobium parahyba var. amazonicum
B supply influences gas exchange The photosynthetic rate (PN) of plants exposed to B high + control suffered a significant decrease of 21%, comparing with B sufficient + control
Summary
Ducke) Barneby, is a forest species of Amazonian origin, which stands out in forestry and agroforestry plantations (Ohashi et al, 2010). This softwood species is used in wood industries for manufacturing plywood blades, as well as in the manufacturing of pulp and paper (Rosa, 2006). Boron (B) is an essential micronutrient for higher plants, and it exercises influence on cell functions and metabolism, and inadequate levels can induce physiological and morphological changes, with negative repercussion on growth and development (El-Hamdaoui et al, 2003; Kastori et al, 2008; Gupta et al, 2014). Interferences on gas exchange like as stomatal closing and lower photosynthesis and respiration rates are detected (Tahkokorpi et al, 2007; Kiani et al, 2008)
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