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Origins and diversity of the Portuguese Landrace of Eucalyptus globulus

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Freeman, JS and Marques, CMP and Carocha, V and Borralho, NMG and Potts, BM and Vaillancourt, RE (2007) Origins and diversity of the Portuguese Landrace of Eucalyptus globulus. Annals of Forest Science, 64 (6). pp. 639-647. ISSN 1286-4560

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Abstract

The Portuguese Landrace of Eucalyptus globulus is of unknown origin, with the earliest plantings of this tree species dating back to the
early 19th century. In Portugal it is currently a major seed source for plantations and is also used in breeding programs. Eucalyptus globulus is native to
south-eastern Australia. The substantial genetic differentiation of chloroplast and nuclear DNA markers between different native geographic races of this
species allowed us to uncover the Australian origins of the Portuguese Landrace and to study its genetic diversity. To achieve this, we sequenced a highly
polymorphic region of chloroplast DNA from 47 Portuguese Landrace individuals, and genotyped 34 of these using seven nuclear microsatellites. We
compared these individuals to those in a database comprising chloroplast DNA sequence profiles from 292 native trees and seven nuclear microsatellites
from 372 native trees. The majority of the Portuguese Landrace samples had closest affinities, in both marker systems, to native trees from south-eastern
Tasmania, but some had affinities to trees from south-eastern Victoria. The discrepancies in the affinities indicated by chloroplast versus nuclear DNA
markers could be explained by inter-race hybridisation after introduction. The genetic diversity in the Portuguese Landrace was less than that found in
native E. globulus at the species level, but was similar to the average diversity found in native races of the species. This study demonstrates the power
of using independent marker systems to identify the origins and diversity of domesticated populations, by comparison with variation in native stands.

Item Type: Article
Keywords: geographic origins,diversity,Portuguese Landrace, Eucalyptus globulus,molecular markers
Journal or Publication Title: Annals of Forest Science
Page Range: pp. 639-647
ISSN: 1286-4560
Identification Number - DOI: 10.1051/forest:2007042
Additional Information:

BM Potts.

Date Deposited: 02 Mar 2008 23:39
Last Modified: 18 Nov 2014 03:30
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