Abstract
The paricá [Schizolobium amazonicum Huber ex Ducke] is a native species of the Amazon region, belonging to the Fabaceae family and is a legume that has great social and economic importance, raw material for the manufacture of wood panels. Heliophilous, with wood of light density and good workability. Amazonian soils are highly weathered and characterized by high acidity, so Al harms the growth and development of sensitive plants, as well as the presence of resistant and/or tolerant plants. Thus, in this work, we sought to study the biochemical metabolism alterations generated in young plants of Schizolobium amazonicum Huber ex Ducke affected at different dosages of AlCl3. The research was conducted in a greenhouse of the Federal Rural University of Amazonia, using pre-scarified paricá seeds, which were seeded in plastic containers of 3.5 L capacity, with black soil fertilized with NPK 15-15-20. On the 8th day after sowing (DAS), thinning of 5 seedlings was performed for 2, and on day 12 of 2 for 1 seedling. The treatments started after 1 month and 22 days of sowing and the plants were collected 24 days later. A completely randomized experimental design (RED) was used, with 6 treatments (Control, Al 15 mg/L-1, Al 30 mg/L-1, Al 45 mg/L-1, Al 60 mg/L-1 and Al 75 mg/L-1) with 5 replicates each (one plant/pot) totaling 30 experimental units. The AlCl3 dosages resulted in considerable changes in the biochemical variables evaluated, especially when the 75 mg·L-1 dosage was applied. The considerable reduction in some variables such as nitrate reductase, glycine betaine and total soluble carbohydrates of these compounds to the applied AlCl3·6H2O dosages, is a way to create resistance mechanisms to try to overcome stress or as a way of showing limitations in the applied dosages. The species was sensitive to the AlCl3 dosages, and resisted only 23 days to the imposed stress. However, it presented defense mechanisms that were able to prolong the physiological activities; since without them, the time of exposure to the stress would possibly be less.
Highlights
In this work, we sought to study the biochemical metabolism alterations generated in young plants of Schizolobium amazonicum Huber ex Ducke affected at different dosages of AlCl3
The results show that the concentrations of toxic aluminum caused a significant reduction in the activity of RNO3− (EC 1.6.6.1), since the first dose (15 mg·L−1), going from 2
1) Biochemical variables indicate that paricá (Schizolobium amazonicum Huber ex Ducke) shows sensitivity to aluminum toxicity in the time and in the dosages studied
Summary
The species meets market expectations, as well as speed, productivity, profitability and environmental protection, since it is widely used in cultivated forests that replace predatory extraction, and can be used to recover large areas of degraded pastures. It is characterized as a deciduous tree. According to Vidaurre et al [3], of all the forest planted in Brazil today, 76.6% is Eucalyptus and 23.4% is Pinus, ensuring a response to growing world demand for fiber and environmental services It is an essentially heliophilic species (it fully realizes its entire life cycle in full sun), which does not tolerate low temperatures. Due to its average density, in the state of Pará, most of the paricá plantation is used for the manufacture of plywood, and its residues and wood tips are used for the manufacture of MDF [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
