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Genetic diversity and phylogenetic relationships within Eucalyptus marginata (Myrtaceae)

Wheeler, M.A., Byrne, M. and McComb, J.A. (2002) Genetic diversity and phylogenetic relationships within Eucalyptus marginata (Myrtaceae). In: Plant breeding for the 11th millenium: 12th Australasian Plant Breeding Conference, 15-20 September, Perth, Western Australia pp. 254-257.

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The eucalypt species Eucalyptus marginata which is harvested for high quality timber comprises three subspecies recognized by morphological characters; E. marginata ssp. marginata, ssp. thalassica, and ssp. elegantella. Genetic diversity and phylogenetic relationships between the subspecies were examined using anonymous nuclear RFLP loci, with Eucalyptus staerei included as an outgroup in the phylogenetic analysis. The level of diversity within the nuclear genome was lower than that found in comparative studies with other eucalypts (A = 2. 7, H4 = 0.345). Most of the variation occurred with ill the populations (96. 9%, H4 = 0.334) The two populations sampled for each of ssp. thalassica and ssp. elegantella clustered together in the UPGMA analysis, however there was little differentiation between the three subspecies overall (D = 0.029). Eucalyptus marginata was clearly distinct from its closest relative E. staerei (0 = 0.16). There is little genetic support for the separation of the subspecies.

Item Type: Conference Paper
Murdoch Affiliation(s): School of Biological Sciences and Biotechnology
Publisher: Australasian Plant Breeding Association
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