Abstract
The aim of this research was to evaluate the effect of abscisic acid (ABA) on gas exchange and the activity of antioxidant enzymes of Ormosia arborea (Vell.) Harms seedlings under water deficit and its influence on the recovery potential of the seedlings. The experiment was conducted using four treatments, being daily irrigation or water restriction without and with 10 μM ABA. Seedlings under water deficit + ABA showed greater adjustment to drought, and when re-irrigated, they restored photosynthetic metabolism and water potential. ABA minimizes the reduction in the photosynthetic metabolism and water potential of the leaf, however, it does not increase the antioxidant activity of the O. arborea seedlings under water deficit. These results suggest that this species exhibits plasticity, which enables it to survive also in environments subjected to temporary water deficit regardless of the supplementation of ABA. We suggest that other doses of ABA be researched to expand the beneficial effect of ABA on this species.
Highlights
The impacts caused by climate change on biodiversity, according to a review of Rodrigues et al (2015), is a theme that has already aroused the interest of researchers since the last decade, which emphasize the importance of considering their consequences on the distribution or mortality of tree species and desertification in some more arid areas
The treatment without any dose of abscisic acid (ABA) showed a lower tolerance to drought compared to the treatment receiving ABA
ABA minimizes the reduction in the photosynthetic metabolism and water potential of the leaf, it does not increase the antioxidant activity of the O. arborea seedlings under water deficit
Summary
Environmental factors, with water stress, influence the growth, development, and productivity of plants (Okasabe et al, 2014; Taiz et al, 2017; Junglos et al, 2018). Water stress due to water restriction results in a decreased transpiration rate and affect biochemical and physiological process. It affects the metabolism of nutrients and plant growth regulators, photosynthesis, respiration, and translocation of photo-assimilates. Water stress reduces plant growth (Campelo et al, 2015; Moraes et al, 2015; Taiz et al, 2017; Junglos et al, 2018)
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