Resumo

ESPITIA C., Miguel; MURILLO G., Olman  e  CASTILLO P., Carlos. Expected genetic gain in teak (Tectona grandis L.f.) in Córdoba (Colombia). Colomb. for. [online]. 2011, vol.14, n.1, pp.81-93. ISSN 0120-0739.

The Córdoba department of Colombia programmed to establish 200000 ha of forest plantations by year 2025. Teak was priorized by its adaptation, wood quality and value in the asian markets. The objective of this research was to estimate the expected genetic gain, of phenotypically selected pluss trees in 5316 ha plantation in Córdoba, for diameter at breast height, commercial height, commercial volume and log quality traits. The selection based on the phenotypical evaluation of the tree candidate and its four best neighbors within a 20 m radius, qualifying, individually the first four segments of 2.5 m length. Selected trees were classified in list A as determined to be superior in both, volume and quality, according to the selection differential to all its four best neighbors. List B included those plus trees found superior only in commercial volume or in stem quality. Genetic gain was estimated by multiplying selection differential X average narrow sense heritability. We estimated a Selection Index that integrate commercial volume (60%) and stem quality (40%). From 46 selected trees, 18 were classified as plus A. In selecting and cloning the 18 best A plus trees, based on the Selection Index, we expected genetic gains of 5.52% (diameter); 17.50% (height); 41.71% (commercial volume) and 9,59% (stem quality). These results suggest an important genetic progress breeding teak in Cordoba, as long as they broaden the genetic base of the program and verify results with genetic testing in various potential production areas.

Palavras-chave : plus trees; quality; selection differential; selection index; teak.

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