Banca de DEFESA: ANDRESSA PINHEIRO DE PAIVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ANDRESSA PINHEIRO DE PAIVA
DATE: 30/04/2021
TIME: 14:30
LOCAL: BELÉM/UFRA.
TITLE:

SELENIUM AS AN ATTENUATOR OF THE CHROME EFFECT ON GERMINATION, GROWTH AND BIOCHEMICAL METABOLISM IN SEEDLINGS OF Schizolobium parayba var. amazonicum Huber ex Ducke

KEY WORDS:

heavy metals, seeds, paricá

PAGES: 58
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Paricá (S. parayba var. Amazonicum Huber ex Ducke) is indicated for plantations and agroforestry systems, with the potential to recover degraded areas due to their rapid growth and production and seed dispersal capacity. Environmental contamination by heavy metals has been associated, in particular, with intense industrial and agricultural activity that in the long term may become irreversible, and chromium (Cr) is a metal with several polluting chemical forms with serious implications for the environment and human health. Recently, several studies have shown that, in plants, selenium (Se) exhibited protective effects against other heavy metals. The objective of the research was to evaluate the effects of doses of chromium chloride and sodium selenate on germination, growth and biochemical metabolism in paricá seedlings. The experiment had treatments of Cr: 0, 80, 160, 240 µM and Se: 0, 5, 10, 15 µM concentrations. The experimental design used was a completely randomized, factorial 4x4 with four replications and the seeds of paricá were supplied by Embrapa. The normality test used was the Shapiro-Wilk test and for the homogeneity test the Levene test was used, both at (p ≤ 0.05) submitted to analysis of variance (ANOVA) accompanied by Tukey test (P <0.05 ). The concentrations of Cr and Se did not affect the germinative variables of the seeds, except for the percentage of germination, with better response in the dose of Se 15 µM (83.50 ± 1.87%.) The increase in the concentrations of Se 5 µM, 10 µM and 15 µM had a negative effect on root length and root dry matter. However, Cr and Se were positively affected by growth in height of paricá seedlings, with better response in the doses of Cr 160 µM and Se 15 µM (24.5 ± 0.3 cm.) In the biochemical metabolism, the Cr and Se negatively affected the production of organic solutes such as glycine-betaine, proline, total soluble amino acids, total soluble proteins and sucrose, in general, in the highest concentrations of Cr160 and 240 µM and Se 10 and 15 µM. However, Se did not provide satisfactory responses as a stress reliever for Cr, as it proved to be harmful to the growth of paricá seedlings.

BANKING MEMBERS:
Presidente - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Externa ao Programa - 1315246 - JOZE MELISA NUNES DE FREITAS
Externo à Instituição - ENIEL DAVID CRUZ - EMBRAPA
Externa à Instituição - LUMA CASTRO DE SOUZA - PMCP