Resumo

ESPITIA, Miguel et al. EXPECTED GENETIC GAIN IN THE SELECTION OF ACACIA (Acacia mangium WILLD.) IN CORDOBA (COLOMBIA). rev.udcaactual.divulg.cient. [online]. 2010, vol.13, n.2, pp.99-107. ISSN 0123-4226.

The competitiveness strategy for Cordoba (Colombia) includes the planting of 200 thousand hectares of forest with species of high demand in the international wood market by the year 2025. The Acacia mangium (Willd) has been recommended because of its excellent adaptation and growth. The expected genetic gain (GG) in the selection of plus trees of acacia in 3626 hectares for the diameter at breast height (DAP), commercial height (ALCO), trade volume (VOLCO) and log quality (CALI) was estimated. The selection was based on the phenotypic evaluation of the candidate tree and its four best neighbors within a radius of 20m. The selected trees were classified in list A when superiority, based on the selection differential (S), in volume and quality was recorded and in list B, when they only exceeded in either volume or quality all their neighbors. The GG was estimated by GG = S*h², where h² is the narrow sense heritability average reported. A Selection Index (SI) was determined, that integrated in weigh up form VOLCO and CALI. From 89 selected trees, 32 were classified as plus A, with values of selection differential of 22% (DAP), of 89% (ALCO), of 194% (VOLCO) and of 52% (CALI). In selecting of the 15 best A trees based on IS, a genetic gain of 4.38% (DAP), of 29.76% (ALCO), of 61.75% (VOLCO) and of 27.27% (CALI) is expected. The results suggest an important genetic progress in the breeding of acacia in Cordoba.

Palavras-chave : Plus trees; selection differential; commercial volume; quality; selection index.

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