Open Access Repository

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

Downloads

Downloads per month over past year

Barbour, RC, 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, vol. 56, no. 3-4 , pp. 127-133 .

[img]
Preview
PDF
Barbour_et_al...pdf | Download (159kB)
Available under University of Tasmania Standard License.

| Preview

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
Authors/Creators:Barbour, RC and Potts, BM and Vaillancourt, RE
Keywords: genetic pollution, genetic contamination, introgression, exotic species, pollen dispersal, Eucalyptus, plantation forestry.
Journal or Publication Title: Silvae Genetica
ISSN: 0037-5349
Additional Information:

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

Item Statistics: View statistics for this item

Actions (login required)

Item Control Page Item Control Page
TOP