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Genetic resources for higher productivity of planted teak forests

Hansen J.K., Raebild A., Kjaer E.D., Ofori D., Koffi A., Vigneron P.. 2008. In : Bhat K.M. (ed.), Balasundaran M. (ed.), Bhat K.V. (ed.), Muralidharan E.M. (ed.), Thulasidas P.K. (ed.). Processing and marketing of teak wood products of planted forests : Proceedings of the Regional Workshop held during 25-28 September 2007, Kerala Forest Research Institute, Peechi, India. Peechi : KFRI, p. 246-249. Regional workshop on Processing and marketing of teak wood products of planted forests, 2007-09-25/2007-09-28, Peechi (Inde).

Results are summarized from two evaluations of five teak provenance trials aged 28 and 32 years located in Ghana and Cotës d'Ivoir. A total of 27 provenances/landraces are represented in field trials of Côte d'Ivoir and 13 in the field trials of Ghana. Provenances highlighted significant difference with regard to growth, stem straightness, stem axis persistence, frequency of epicormics and protuberant buds, height of fork, tendency to buttress and circularity of stems. The differences were especially pronounced in the case of growth, stem straightness and to some extent, presence of epicormics. Especially, provenance from Nilambur (India) showed both above average growth and stem straightness in the respective field trials they were tested. A significant genotype-environment interaction was found for growth mainly due to provenances from the dryer Indonesia with an aboveaverage growth at a semi-deciduous dry site and below-average growth at two more moist sites. No genotype-environment interaction was present for stem straightness or epicormics. The correlation at provenance level between early (age 9 or 17) and late (age 28) epicormic scores was high. This was also the case for the basal area, while the age-age correlations as regards stem straightness were more uncertain. The studies stress the importance of choosing the right provenances for breeding programs of teak.

Mots-clés : tectona grandis; côte d'ivoire; ghana

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