Longitudinal analysis of Pinus caribaea var. hondurensis full-sibling progenies based on multivariate analysis
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Ishibashi, Vanessa [1] ; Flores-Junior, Paulo C. [2] ; Martinez , Diego T. ; Coelho, Alexandre S. G. ; Higa, Antonio R. [1]
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[1] Universidade Federal do Paraná
Universidade Federal do Paraná
Brasil
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[2] Federal Rural University of the Amazon. Estr. Principal da Ufra 2150, 66077-830 Belém, PA, Brazil
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- Localización: Forest systems, ISSN 2171-5068, ISSN-e 2171-9845, Vol. 31, Nº. 2, 2022
- Idioma: inglés
- Enlaces
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Resumen
Aim of study: To define an early selection strategy based on tests applied to full-sibling progenies of Pinus caribaea var. hondurensis grown in the Cerrado Biome.
Area of study: Prata region (MG), Brazil.
Material and methods: Progeny tests were cultivated in 2006; the study followed a completely randomized design, with 79 families of full-siblings and 15 repetitions, with one plant per plot. Thinning was carried out at the age of 6 and 8 years; 615 individuals and 44 families were included in the test. The following quantitative variables were used in the statistical analysis of data on the remaining individuals: diameter at breast height (DBH) in cm, total height (H) in m, and volume in dm³ at the age of 3, 4, 5, 6, 7, 8 and 11 years. BLUP multi-trait multivariate model, with non-structured covariance structure matrix, was adopted for calculations.
Main results: There were strong additive genetic correlations (above 90%) between variables DBH and H, in all analyzed ages. Strong volume correlations were estimated based on the age group over four years; volume selection efficiency reached its peak at the age of five years. Selection based on volume at the age of 5 years leads to genetic gains in this variable; selection intensity values can range from 7.8% to 6.4% and 5.4%, and from 10% to 20% and 30%.
Research highlights: The best strategy lies on carrying out the selections at the age of five years, based on 30% selection intensity.
