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Exploration of the Eucalyptus globulus gene pool

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Potts, BM and Vaillancourt, RE and Jordan, GJ and Dutkowski, GW and da Costa e Silva, J and McKinnon, GE and Steane, DA and Volker, PW and Lopez, GA and Apiolaza, L and Li, J and Marques, CMP and Borralho, NMG (2004) Exploration of the Eucalyptus globulus gene pool. In: Eucalyptus in a changing world. International IUFRO Conference, 11-15 Oct 2004, Aveiro, Portugal.

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Abstract

The first Europeans to discover Eucalyptus
globulus were French explorers in 1792. Its seed
was rapidly spread throughout the world in the
19th century and this was the species by which
much of the world first knew the genus.
However, it was in the industrial forests of the
20th century that this species, once considered
the ‘Prince of Eucalypts’, achieved greatest
prominence due to its fast growth and superior
pulp qualities. Formal breeding first commenced
in 1966 in Portugal and in the late 1980’s large
base population trials from open-pollinated seed
collections from native stands were established
in many countries. These trials have provided
unprecedented insights into the quantitative
genetic control of numerous traits of economic
and ecological importance and how this variation
is spatially distributed in the native range of the
species. However with large, fully pedigreed
breeding populations becoming available for
quantitative analysis and the rapidly expanding
knowledge of DNA sequence variation, we are
now at the threshold of a new understanding of
this important eucalypt gene pool. Indications of
the significance of non-additive genetic effects
are becoming available. The E. globulus
chloroplast genome has now been sequenced
and several genome maps have been published.
Studies of the variation in nuclear microsatellites
and the lignin biosynthesis gene CCR confirm
the complex, spatially structured nature of the
native gene pool. Strong spatial structuring of
the chloroplast genome has provided a tool for
tracking seed migration and the geographic
origin of exotic landraces. Highly divergent
lineages of chloroplast DNA have been
discovered and studies of the hypervariable JLA+
region argue that some components of the E.
globulus gene pool have been assimilated from
other species following hybridisation.

Item Type: Conference or Workshop Item (Paper)
Keywords: Eucalyptus globulus, gene pool
Additional Information:

BM Potts.

Date Deposited: 13 Oct 2008 00:25
Last Modified: 18 Nov 2014 03:51
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