Variation in early growth in a second-generation whitewood (Endospermum medullosum) progeny trial in Vanuatu

Tony Page; D Bush; M Sethy; J Doran

doi:10.1080/00049158.2017.1321462

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Variation in early growth in a second-generation whitewood (Endospermum medullosum) progeny trial in Vanuatu

Journal article

Peer reviewed

Variation in early growth in a second-generation whitewood (Endospermum medullosum) progeny trial in Vanuatu

Tony Page, D Bush, M Sethy and J Doran

Australian Forestry, Vol.80(3), pp.121-126

2017

DOI: https://doi.org/10.1080/00049158.2017.1321462

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Abstract

diameter

height

form

heritability

genetic correlation

genetic diversity

Endospermum medullosum (whitewood) is a commercially important plantation and agroforestry timber species in Vanuatu, used locally and for export. Commercial development depends on both increased productivity and genetic resource conservation. A second-generation progeny trial on Espiritu Santo Island was measured at ages 2 and 3 years. Growth traits were of low-to-moderate heritability, varying from 0.13 for height at 2 years, to 0.30 for diameter at breast height (DBH) at 3 years. Genetic correlations between growth and form traits were generally encouraging, with form at 3 years moderately-positively correlated (0.49 to 0.56) with the growth measures at ages 2 and 3 years, and no adverse correlations evident. Families of Espiritu Santo origins were consistently amongst the highest ranked for both growth and form traits, while families of Malekula and Pentecost Island performed poorly. These results are supportive of the recurrent selection and breeding strategy being implemented to deliver economic gains in growth traits. With natural populations severely depleted or extinct, the breeding population constitutes a repository for genetic variation already lost from wild sources. The long-term sustainability of the breeding program will therefore depend on provisions made for both improvement (narrowing of variation) and conservation (broadening of variation) of genetic resources. © 2017 Institute of Foresters of Australia (IFA)

Details

Title: Variation in early growth in a second-generation whitewood (Endospermum medullosum) progeny trial in Vanuatu
Authors: Tony Page (Author) - University of the Sunshine Coast - Faculty of Arts, Business and Law
D Bush (Author) - CSIRO National Collection and Marine Infrastructure
M Sethy (Author) - Department of Forests Vanuatu, Vanuatu
J Doran (Author) - CSIRO National Collection and Marine Infrastructure
Publication details: Australian Forestry, Vol.80(3), pp.121-126
Publisher: Taylor & Francis Australasia
Date published: 2017
DOI: 10.1080/00049158.2017.1321462
ISSN: 0004-9158
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: 99451285002621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Forestry

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