Growth variations and heritabilities of teak CSO-derived families and provenances planted in two humid tropical sites

Goh, Doreen K. S. and Bacilieri, Roberto and Chaix, Gilles and Monteuuis, Olivier (2013) Growth variations and heritabilities of teak CSO-derived families and provenances planted in two humid tropical sites. Tree Genetics & Genomes, 9 (5). pp. 1329-1341. ISSN 1614-2942

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Abstract

Sixteen families derived from a clonal seed orchard (CSO) and 10 “provenances” (Prov) of teak (Tectona grandis) were tested in two different sites to be compared with respect to their growth performances. Both sites were located in Sabah, East Malaysia, under 2,500 mm of annual rainfall and no distinct dry season. The land in Taliwas was flat but prone to waterlogging. In Luasong, the soil was more hilly, acidic, and less fertile, though deeper. Nearly 9 years after planting, the two classes of genetic entries showed significant differences for height (P=0.0002) and diameter at breast height (DBH) and volume (P<0.0001) for the two sites combined. The superiority of the CSO families compared with the Prov class was more obvious in Luasong with averages of 18.0 vs 15.2 m (+18.6 %) for height, 18.1 vs 15.1 cm (+20.2 %) for DBH, and 0.179 vs 0.107 mᶾ for individual tree volume (+67.9 %), as against 17.4 vs 15.7 m (+11.2 %), 19.1 vs 16.8 cm (+13.5 %), and 0.176 vs 0.126 mᶾ (+40.3 %), respectively, in Taliwas. The CSO families were also more prone to site interaction for height (P=0.004) and, to a lesser extent, for volume (P=0.017) than the “Prov” (P=0.030 and P=0.057, respectively). Narrow-sense

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