Metodologias para avaliação de kino e estimativas de parâmetros genéticos em Corymbia

Michelle Brandão Damacena; Rodrigo Alves; Gleison Augusto dos Santos; Leonardo Lopes Bhering; Genaina Aparecida de Souza; Karine Fernandes Caiafa; Caio Varonill de Almada Oliveira; Ana Luiza Machado Gouvêa

doi:10.53661/1806-9088202448263712.

Authors

Michelle Brandão Damacena Universidade Federal de Viçosa, Programa de Pós-Graduação em Genética e Melhoramento, Viçosa, MG - Brasil
Rodrigo Alves Cenibra, Guanhães, MG - Brasil
Gleison Augusto dos Santos Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa, MG - Brasil
Leonardo Lopes Bhering Universidade Federal de Viçosa, Departamento de Biologia Geral, Viçosa, MG - Brasil
Genaina Aparecida de Souza Universidade Federal de Viçosa, Programa de Pós-Graduação em Fisiologia Vegetal, Viçosa, MG - Brasil
Karine Fernandes Caiafa Universidade Federal de Viçosa, Viçosa, MG - Brasil
Caio Varonill de Almada Oliveira Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil
Ana Luiza Machado Gouvêa Universidade Federal de Viçosa, Programa de Pós-Graduação em Ciência Florestal, Viçosa, MG - Brasil

DOI:

https://doi.org/10.53661/1806-9088202448263712.

Keywords:

Forest improvement, wood quality, genotypic correlation, gummosis

Abstract

Species within the genus Corymbia are regarded as potential alternatives to Eucalyptus. In addition to having superior wood quality, Corymbia spp. are tolerant to most pests, diseases, and abiotic stresses that affecting Eucalyptus plantations, including physiological disorders, water deficit, and wind damage. However, environmental stresses stimulate kino production, which decreases the quality of pulp and sawn wood. This study aimed to develop a method for evaluating kinoand estimate genetic parameters in Corymbia. For this, 16 Corymbia (C. citriodora × C. torelliana) hybrid clones and 5 clones of Eucalyptus were used. Two evaluation methods (M1 and M2) were tested for kino evaluation; M1 consisted of drilling the bark with Pilodyn and M2 consisted of drilling the heartwood with Pilodyn. The following kino parameters were evaluated: exudation incidence, exudate length which flowed over the stem, and exudate weight. Genetic parameters were estimated by a mixed model method (REML/BLUP). The significance of random effects of the statistical model was tested by the likelihood ratio test. Significant clone effects were obtained for all kino parameters, except for exudate length as assessed by M2. Kino parameters determined by M1 exhibited higher heritability and accuracy. Therefore, M1 should be preferred for kino evaluation in Corymbia.

Keywords: Forest improvement; wood quality; genotypic correlation; gummosis.