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Gene flow between introduced and native Eucalyptus species: morphological analysis of Tri-Species and backcross hybrids involving E. nitens

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Barbour, RC and Potts, BM and Vaillancourt, RE (2007) Gene flow between introduced and native Eucalyptus species: morphological analysis of Tri-Species and backcross hybrids involving E. nitens. Silvae Genetica, 56 (3-4). pp. 127-133. ISSN 0037-5349

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Abstract

Morphometric analyses were conducted on secondgeneration
tri-species and backcross hybrids in Eucalyptus.
These hybrids were all produced using pollen from
two E. nitens x cordata F1 hybrids and controlled pollination
techniques. Tri-species hybrids were created with
E. gunnii, E. ovata and E. viminalis as females, while
backcrosses were produced with E. cordata. Multivari
ate
analysis of seedling characteristics indicated that
eighty percent of the backcross hybrids fell within the
morphological range of E. cordata. All three cross combinations
of the tri-species hybrids were biased away from
E. nitens and towards their maternal parent and E. cordata.
The inclusion of data for first-generation (F1)
hybrids between the pure parental species in the current
work showed the F1’s to be easily distinguishable
from pure species, compared to second-generation
hybrids. The use of morphology for detecting secondgeneration
hybridisation involving exotic plantation
species and native eucalypt populations will therefore be
unreliable, and identifies a need for preventing secondgeneration
hybrids from establish in the wild. The current
work, nevertheless, provides further demonstration
of the effectiveness of morphological identification of F1
hybrids. The easy recognition of F1 hybrids will be useful
in identifying sites and species at risk of exotic gene
flow and enable the development of weeding programs
that focus on removing exotic hybrids in the wild.

Item Type: Article
Keywords: genetic pollution, genetic contamination, introgression, exotic species, pollen dispersal, Eucalyptus, plantation forestry.
Journal or Publication Title: Silvae Genetica
Page Range: pp. 127-133
ISSN: 0037-5349
Additional Information:

BM Potts. Free online access to the archives of SILVAE GENETICA

Date Deposited: 27 Feb 2008 22:38
Last Modified: 18 Nov 2014 03:30
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