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The genetic control of flowering precocity in Eucalyptus globulus ssp. globulus

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Chambers, PGS and Potts, BM and Tilyard, P (1997) The genetic control of flowering precocity in Eucalyptus globulus ssp. globulus. Silvae Genetica, 46 (4). pp. 207-214. ISSN 0037-5349

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Abstract

The genetic control of flowering precocity was examined
in 4 base population trials of Eucalyptus globulus ssp. globulus
in Tasmania, which include nearly 600 open-pollinated families
from 46 collection localities. Flowering precocity (measured as
the presence/absence of capsules and or flower buds at age 4)
was found to be highly heritable (h2
L = 0.47 or 0.59; averaged
across 3 or 4 trials respectively), and exhibit little genotype by
environment interaction. Significant differences in the propensity
for flowering precocity were observed between the 4 trials
and also between different collecting localities. Progenies from
localities on the Furneaux Group of islands showed significantly
earlier flowering than those from other localities. Flowering
precocity was generally not genetically correlated with growth
(average rg = 0.04), indicating that selection for this trait alone
would have little impact on early growth. In addition precocious
flowering was not significantly correlated with pilodyn
penetration (average rg = –0.07), although the consistent negative
genetic correlation across 4 trials may be indicative of a
weak positive genetic relationship with wood density. The
potential of selecting for precocious flowering as a means of
decreasing the generation interval in breeding programs is
discussed.

Item Type: Article
Keywords: REML, heritability, genetic correlation, generation interval, provenances, binomial traits.
Journal or Publication Title: Silvae Genetica
Page Range: pp. 207-214
ISSN: 0037-5349
Additional Information:

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

Date Deposited: 27 Feb 2008 00:44
Last Modified: 18 Nov 2014 03:30
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