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Fifteen clones of teak (Tectona grandis) produced by micropropagation from 0.5 to more than 60 yr-old selected ortets were established in a clonal test in Sabah (East Malaysia) under 2500 mm of annual rainfall to compare their growth performances during the first 7 years of development. Field establishment was good with average mortality less than 10%. The clones developed rapidly true-to-type with significant between-clone differences in growth. Ranges of clone means were 13.6 to 19.3 m in height, 16.3 to 23.4 cm in diameter at breast height (DBH) and 129 to 264 dm3 in volume. Broad sense heritability estimates for these growth traits were lower overall for single trees (H 2 i) than for clone means (H 2 c) (H 2 i ≤ 0.257 vs H 2 c ≤ 0.634 for height, H 2 i ≤ 0.120 vs H 2 c ≤ 0.383 for DBH and H 2 i ≤ 0.125 vs H 2 c ≤ 0.364 for volume). The highest genetic gain that could be expected from the best three clones out of the fifteen compared was at age 2 for height (+0.66 m, or +11.7%), and age 3 for DBH (+0.87cm, or +10.4%) and volume (+4.65 dm 3 , or +15.7%). Age-related phenotypic correlation values were reliably (P &lt; 0.0001) higher and more consistent for DBH (r P  ≥ 0.61) than for height (0.37 ≤ r P  ≤ 0.69), or than between DBH and height, except for height at 3 (0.51 ≤ r P  ≤ 0.63) and 6 (0.55 ≤ r P  ≤ 0.69) years. Height and DBH were moderately to highly genetically correlated (0.54 ≤ r G  ≤ 0.90).

silvae genetica/silvae genetica

Growth differences and genetic parameter estimates of 15 teak (Tectona grandis L.f.) genotypes of various ages clonally propagated by microcuttings and planted under humid tropical conditions