Banca de DEFESA: MAICON DE SOUZA PECEGUEIRO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : MAICON DE SOUZA PECEGUEIRO
DATA : 04/03/2021
HORA: 08:00
LOCAL: Sinop
TÍTULO:

Pre-breeding of balsa stick (Ochroma pyramidale Cav. Ex Lam. Urb.)

PALAVRAS-CHAVES:

Forest improvement, Prediction, Vegetative propagation

PÁGINAS: 59
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Melhoramento Vegetal
RESUMO:

The balsa stick is a native species of the Amazon, occurring in Brazil and neighboring countries, having as a characteristic low density of wood, being used in the nautical and aeronautical industries. However, its use is not restricted only to these areas, but occurs from the furniture industries to medicinal purposes. Due to their characteristic of rapid growth, foresters in the state of Mato Grosso implemented commercial crops, but with seedlings without selection and standardization and little information on the crop. In order to promote the pre-improvement of the crop, the objective of this work was to estimate the basic density of the wood in situ, to evaluate the phenotypic variability among individuals planted in Mato Grosso and to validate proposed vegetative propagation techniques for the species. To predict the density of the wood, Pilodyn equipment was used on 20 adult trees. From each individual, three sampling points were determined: at the base of the trunk, at 1.30 m and 3.10 m, on the north and south sides of the tree. The use of Pilodyn for the prediction of the basic density of the wood in the balsa stick proved to be efficient and applicable when performed at 1.30 m in height. For the selection and phenotypic divergence, 70 individuals of balsa stick, seeds from Brazil and Ecuador were selected. The following measures were obtained: total height of the individual, DBH and basic wood density. The Euclidean dissimilarity matrix and the Toucher optimization method were performed. Variability was found between individuals, with the formation of nine different groups using the Toucher optimization method, with emphasis on genotypes A09 and A14, both of Ecuadorian origin. For vegetative propagation, 240 cuttings were selected from 10 pre-selected matrices. The treatments were carried out with different concentrations of AIB, in DIC, with 4 repetitions. The percentage of survival, calluses and root formation after 60 days were analyzed. It was found that after this period, the treatments did not obtain a significant response to root formation, and presented low survival, making the vegetative propagation of balsa stick unfeasible by cutting. Analyzing the research for the pre-breeding of the species, Pilodyn is indicated for in situ assessment of the wood density at 1.30 in height and that the analyzed plantations present phenotypic variability, with emphasis on trees of Ecuadorian origin. However, vegetative propagation through cuttings proved to be unfeasible for the species.

MEMBROS DA BANCA:
Interno - 607.835.671-20 - EULÁLIA SOLER SOBREIRA HOOGERHEIDE - USP
Interno - 59687004 - MAURECILNE LEMES DA SILVA
Interno - 129897002 - ISANE VERA KARSBURG
Externo ao Programa - 253520001 - WESCLEY VIANA EVANGELISTA
Externo à Instituição - MAUREL BEHLING - EMBRAPA