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

Abstract

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 (H2i) than for clone means (H2c) (H2i ≤ 0.257 vs H2c ≤ 0.634 for height, H2i ≤ 0.120 vs H2c ≤ 0.383 for DBH and H2i ≤ 0.125 vs H2c ≤ 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 dm3, or +15.7%). Age-related phenotypic correlation values were reliably (P < 0.0001) higher and more consistent for DBH (rP ≥ 0.61) than for height (0.37 ≤ rP ≤ 0.69), or than between DBH and height, except for height at 3 (0.51 ≤ rP ≤ 0.63) and 6 (0.55 ≤ rP ≤ 0.69) years. Height and DBH were moderately to highly genetically correlated (0.54 ≤ rG ≤ 0.90).

Genetic parameters in a clonal test of Tectona grandis in Mato Grosso, Brazil

“…The moderate values of clonal mean heritability found for GBH were similar to those observed in the literature for clonal tests of teak at three to seven years of age in Malaysia, in which the clonal mean heritability for GBH ranged from 0.29 to 0.33 (Goh et al 2013). In Costa Rica, in a fouryear clonal test, the estimated values were 0.36 for GBH (Naranjo et al 2012).…”

“…Although the literature reports studies related to the estimation of genetic parameters in clonal tests of teak in other countries (Callister and Collins 2008;Monteuuis et al 2011;Naranjo et al 2012;Goh et al 2013), to the best of our knowledge, this is the first study with estimates of genetic parameters in a clonal teak test in the field in Brazil. Therefore, this information can assist in the decision making of the best strategies in teak breeding programs in this country.…”

Worldwide translocation of teak—origin of landraces and present genetic base

“…Large potential exists for the improvement of timber quality through breeding (Kjaer and Foster 1996;Goh et al 2013b), but it is important to build breeding programmes on genetically healthy and diverse plant material. It is therefore an important finding that the major landraces, in general, seem to be genetically diverse and not to have suffered from severe bottlenecks during their translocation.…”

Pertumbuhan Bibit Hasil Okulasi Pada Beberapa Klon Jati Dari Gunungkidul Dan Wonogiri

“…Dari serangkaian kegiatan penelitian tersebut kemudian dilakukan seleksi pohonpohon (individu) unggulan yang memiliki potensi atau prospek untuk dikembangkan secara luas pada masa yang akan datang. Ciriciri pohon unggulan tersebut antara lain tinggi pohon dominan, tinggi bebas cabang, diameter batang dominan, batang lurus, bebas hama/penyakit dan memiliki pertumbuhan yang cepat (Goh et al, 2013).…”