Banca de DEFESA: MARIANE KAORI SASAYA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MARIANE KAORI SASAYA
DATA : 10/03/2021
HORA: 08:00
LOCAL: PPGBioagro
TÍTULO:

Aspects of germination and morphological description of Seedling in different pHs of native forest species used in forest restoration programs in the Southern Amazon. 

PALAVRAS-CHAVES:

Seedling morphology, Forest seeds, Edaphic factors, Direct seeding.

PÁGINAS: 64
GRANDE ÁREA: Ciências Agrárias
ÁREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
ESPECIALIDADE: Sementes Florestais
RESUMO:

The demand for silvicultural knowledge aimed at native species in Brazil, in recent years, has increased significantly, mainly due to incentives for the restoration of riparian forests and the recovery of degraded areas, since the success of the implementation of reforestation programs depends on basic information about the species to be used. Since the study of environmental and edaphic limiting factors such as pH in germination and seedling development contribute to the choice of species for adverse situations in the field and consequently in implementing forest restoration. And the seedling morphological studies help in the botanical identification, contributing with the recognition of the seedling species in forest formations. However, little is known about the characteristics of native forest species due to the scarcity of studies carried out with species mainly in the Southern Amazon. Thus, the aim of this study was to evaluate the influence of pH on germination and on the development of seedlings of forest species native to the Southern Amazon. And yet, perform the morphological description of the germination process to the seedling by means of illustration of species used in forest restoration programs in the region. In the analysis of the pH influence, in the germination test with the following species: Bauhinia ungulata; Cecropia pachystachya; Chloroleucon tortum; Colubrina glandulosa; Enterolobium schomburgkii.; Guazuma ulmifolia Lam.; Samanea tubulosa; Parkia pendula; and Senna multijuga. Wetting was carried out using solutions with regulated pH: 2.0; 3.0; 4.0; 5.0; 6.0; 7.0; 8.0; 9.0; 10.0; and 11.0. And the percentage of final germination and the germination speed index were determined, as well as shoot length, radicle length, total length, and weight through seedling morphometric analysis. The germination tests were conducted in a completely randomized design, and the data analysis was performed using the Kruskal-Wallis test, followed by Dunn's post-hoc test with Bonferroni-type p-value adjustment (p <0.05). The description and morphological illustration of the germination process until seedling were carried out by monitoring the development of normal seedlings. For most of the analyzed species, there was a decrease in the values of the variables analyzed at extreme pHs, especially at pH 2 and 11. However, for all species analyzed, for a wide pH range tested, the species presented satisfactory germination rate, where they presented excellent performance at pH 5. As for the morphometric description, the characteristics observed in the three stages of seedling development, can assist as guides in the identification of species in the seedling phase in the field, as well how to help distinguish between normal and abnormal seedlings.

MEMBROS DA BANCA:
Interno - 253817001 - JULIANA GARLET
Interno - 117000004 - MARCO ANTONIO CAMILLO DE CARVALHO
Externo à Instituição - Caciara Gonzatto Maciel - UFRGS
Externo à Instituição - JARDEL BOSCARDIN - UFU