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Abstract

Intra-specific hybrids within Eucalyptus nitens
and E. globulus were compared directly with inter-specific
E. nitens × globulus using common parents. Diameter (age
2, 4, 6, 10 years) and Pilodyn (age 6 years) were used as
indirect measures of growth and wood density, respectively.
Genetic parameters were estimated for all cross types and
traits. A direct comparison of the general combining ability
with the general hybridising ability was made. Heterosis
was estimated for intra- and inter-specific hybrids. The
intra-specific hybrids in both species exhibit intermediate
heritabilities and levels of additive genetic variance. The
inter-specific F1 E. nitens × globulus exhibited high
incidence of abnormalities at young ages and high levels
of later age mortality. The mean performance of surviving
inter-specific F1 hybrids was generally intermediate for all
traits, to varying degrees, between the parental intraspecific
crosses, and there is little evidence for significant
heterosis. Different provenances of E. globulus may exhibit
different responses to hybridisation. In this case, the interspecific
F1 hybrids, using Taranna E. globulus, appear to
perform worse on average than those using King Island
provenance for growth traits. There is evidence that specific
hybrid families are produced that outperform most of the
pure species families for one or other of the traits examined;
however, there is no reliable quantitative genetic method of
predicting which parents should be used.

Item Type:	Article
Authors/Creators:	Volker, PW and Potts, BM and Borralho, NMG
Keywords:	Genetic parameters Eucalypts F1 hybrids
Journal or Publication Title:	Tree Genetics & Genomes
ISSN:	1614-2942
DOI / ID Number:	https://doi.org/10.1007/s11295-007-0122-0
Additional Information:	BM Potts. The original publication is available at www.springerlink.com
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