Basic density, diameter and radial variation of vanuatu whitewood (Endospermum medullosum): Potential for breeding in a low density, tropical hardwood

D J Settle; Tony Page; D Bush; J Doran; M Sethy; I Viji

doi:10.1505/146554812804715810

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Basic density, diameter and radial variation of vanuatu whitewood (Endospermum medullosum): Potential for breeding in a low density, tropical hardwood

Journal article

Peer reviewed

Basic density, diameter and radial variation of vanuatu whitewood (Endospermum medullosum): Potential for breeding in a low density, tropical hardwood

D J Settle, Tony Page, D Bush, J Doran, M Sethy and I Viji

International Forestry Review, Vol.14(4), pp.463-475

2012

DOI: https://doi.org/10.1505/146554812804715810

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Abstract

density

diameter

radial variation

heritabilities

genetic correlation

Vanuatu whitewood (Endospermum medullosum L.S. Smith) is an economically important timber species for Vanuatu. Inter- and intraprovenance genetic parameters for stem diameter at breast height, basic density and radial variation in density, were estimated for two provenances selected from a 12.4-year-old open-pollinated seed orchard on Espiritu Santo Island, Vanuatu. Kole provenance exhibited the highest mean basic density, greatest mean diameter and greatest radial variation in density across the stem. Mean basic density at breast height was 345±2 kg/m3 . Growth rings were not visually discernable and colour was homogenous across all samples. For radial variation determination, each pith-bark core was sectioned into four equi-length subcores (A-D). Subcore density increased consistently and significantly from pith to bark, with mean basic density of 308±3, 327±3, 343±3 and 359±3 kg/m3 for cores A-D respectivel y. The narrow-sense heritability estimate (ĥ2 ) was low (0.26±0.2) for diameter, with a moderate coefficient of additive genetic variation (CVA= 17.61%). Estimated ĥ2 for density was moderate (0.49±0.24), with a low coefficient of additive genetic variation (CVA= 5.39%). Though the precision of these estimates is modest, reflective of the small sample size, indications are that the heritable genetic variation in both growth and quality traits will result in economic gain from a recurrent selection and breeding program.

Details

Title: Basic density, diameter and radial variation of vanuatu whitewood (Endospermum medullosum): Potential for breeding in a low density, tropical hardwood
Authors: D J Settle (Author) - James Cook University
Tony Page (Author) - James Cook University
D Bush (Author) - CSIRO Plant Industries
J Doran (Author) - CSIRO Plant Industries
M Sethy (Author) - Department of Forests Vanuatu, Vanuatu
I Viji (Author) - Department of Forests Vanuatu, Vanuatu
Publication details: International Forestry Review, Vol.14(4), pp.463-475
Publisher: Commonwealth Forestry Association
Date published: 2012
DOI: 10.1505/146554812804715810
ISSN: 1465-5489
Organisation Unit: Australian Centre for Pacific Islands Research; Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99451202902621
Output Type: Journal article

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