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Genetic control of flowering time in Eucalyptus globulus ssp. globulus

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Jones, RC and Vaillancourt, RE and Gore, PL and Potts, BM (2011) Genetic control of flowering time in Eucalyptus globulus ssp. globulus. Tree Genetics & Genomes, 7 (6). pp. 1209-1218.

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Abstract

Understanding the factors affecting variation in
phenology within a species is important as flowering time
constitutes one of the major barriers to gene flow. We
studied the genetic and environmental control of flower
initiation and anthesis time in E. globulus ssp. globulus. For
5 years, flower initiation and anthesis were monitored in a
seed orchard containing clones of 63 genotypes from four
different regions of the species’ natural distribution.
Anthesis occurred over a long period each year, spanning
as much as 9 months in 2008. This variation was under
strong genetic control with little genotype by year interaction
(broad-sense heritability, Ĥ2=0.78±0.04). There were
highly significant differences among regions; anthesis
occurred earlier for Furneaux and Tasmania than Strzelecki
and Otways each year. Surprisingly though, there was little
variation in flower initiation time between regions and
genotypes, and this was under weak genetic control (Ĥ2=
0.06±0.05). The average anthesis time in the orchard varied
from year to year, and there was evidence that heat sum was
a major driver of this environmental variation. Anthesis
time is controlled by both genetic and environmental
factors, with the responses to each being predictable to
some extent, and unrelated to the timing of flower
initiation.

Item Type: Article
Keywords: Flowering time . Flower initiation . Anthesis . Genetic control . Phenology. Heat sum . Seed orchard
Journal or Publication Title: Tree Genetics & Genomes
Page Range: pp. 1209-1218
Identification Number - DOI: 10.1007/s11295-011-0407-1
Additional Information:

The final publication is available at http://www.springerlink.com

Date Deposited: 29 Nov 2011 01:04
Last Modified: 18 Nov 2014 04:25
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