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Gene flow between introduced and native Eucalyptus species

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Barbour, RC and Potts, BM and Vaillancourt, RE and Tibbits, WN and Wiltshire, RJE (2002) Gene flow between introduced and native Eucalyptus species. New Forests, 23 (3). pp. 177-191. ISSN 0169-4286

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Abstract

The first evidence of in situ F hybridisation between an introduced eucalypt plantation 1 species, Eucalyptus nitens, and a native eucalypt species is presented. Open-pollinated seed was collected from a mature E. nitens trial and from the adjacent native species, E. ovata and E. viminalis on the island of Tasmania. Nearly 70 000 seedlings were grown to a size at which hybrids could be clearly distinguished from pure species seedlings on the basis of morphology and a nearly species-specific isozyme allele. Hybridisation was observed between E. nitens and E. ovata, but no hybrids involving E. viminalis were found. This pattern of hybridisation was consistent with the flowering time overlap between the E. ovata and E. nitens. Eucalyptus nitens progenies displayed a low and relatively homogeneous level of hybridisation, averaging 0.15% per tree. In comparison, the proportion of hybrids obtained from the adjacent E. ovata trees varied from 0.04 to 16% per tree.Whether progeny arising from such hybridisation will survive and grow in nature to allow for backcrossing and introgression of the exotic genes into the native population is not yet known.

Item Type: Article
Keywords: Exotic, Genetic pollution, Hybridisation, Introgression, Plantation, Pollen dispersal, Seed orchard contamination
Journal or Publication Title: New Forests
Page Range: pp. 177-191
ISSN: 0169-4286
Identification Number - DOI: 10.1023/A:1020389432492
Additional Information: BM Potts. The original publication is available at www.springerlink.com
Date Deposited: 20 Feb 2008 01:05
Last Modified: 18 Nov 2014 03:30
URI: http://eprints.utas.edu.au/id/eprint/3253
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