Resumo

LLANOS MAYOR, Luis Felipe; BARRIOS, Alonso  e  LOPEZ, Ana Milena. Genetic variation among half-sib families of Tectona grandis L.f.in Colombia. Colomb. for. [online]. 2019, vol.22, n.2, pp.30-43. ISSN 0120-0739.  https://doi.org/10.14483/2256201x.13797.

Teak is a commercial tree species of high interest, mainly for its outstanding wood physical and mechanical properties, growth rates and adaptability. The aim of the study was to evaluate the genetic variation of growth and tree quality traits among 40 half-sib families. Using data from a 4-year-old progeny test, narrow sense heritabilities, genetic gains, and genetic correlations were calculated, as well as a ranking of families according to total wood volume per hectare. All the families showed a higher survival rate ranging from 73-100 %. The genetic gains by selecting 30 % of the best families were of 2.93 % for diameter, 4.83 % for stem volume, 11.97 % for total volume per hectare, 6.53 % for crown projection area, 4.26 % for branch insertion angle and 14.42 % for number of basal sprouts. Three families with superior productivity and potential for the establishment of high yield plantations were identified.

Palavras-chave : breeding; genetic parameters; selection; teak; forest management; wood volume..

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