TITLE:
Nitrogen Metabolism, Carbohydrates and Sucrose in Young Plants of Paricá (Schizolobium amazonicum) Submitted to Different Dosages of Aluminum
AUTHORS:
Vitor Resende do Nascimento, Diana Jhulia Palheta de Sousa, Jéssica Suellen Silva Teixeira, José Jean Borges Leão, Liliane Correa Machado, Glauco André dos Santos Nogueira, Cândido Ferreira de Oliveira Neto, Ana Ecídia de Araújo Brito, Ricardo Shigueru Okumura, Waldemar Viana de Andrade Júnior
KEYWORDS:
Dosages, Aluminum Stress, Schizolobium amazonicum
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.4,
March
29,
2018
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.