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The genetic variation in the timing of heteroblastic transition in Eucalyptus globulus is stable across environments


Hamilton, MG and Tilyard, PA and Williams, DR and Vaillancourt, RE and Wardlaw, TJ and Potts, BM, The genetic variation in the timing of heteroblastic transition in Eucalyptus globulus is stable across environments, Australian Journal of Botany, 59, (2) pp. 170-175. ISSN 0067-1924 (2011) [Refereed Article]

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Copyright Statement

Copyright 2011 CSIRO

DOI: doi:10.1071/BT10313


Eucalyptus globulus is one of the best known examples of a heteroblastic plant. It exhibits a dramatic phase change from distinctive juvenile to adult leaves, but the timing of this transition varies markedly. We examined the genetic variation in the timing of heteroblastic transition using five large open-pollinated progeny trials established in north-western Tasmania. We used univariate and multi-variate mixed models to analyse data on the presence/absence of adult or intermediate foliage at age 2 years from a total of 14 860 trees across five trials, as well as height to heteroblastic phase change from one trial. Up to 566 families and 15 geographic subraces of E. globulus were represented in the trials. The timing of the heteroblastic transition was genetically variable and under strong genetic control at the subrace and within-subrace level, with single-trial narrow-sense heritability estimates for the binary trait averaging 0.50 (range 0.440.65). The degree of quantitative trait ifferentiation in the timing of heteroblastic transition among subraces, as measured by QST, exceeded the published level of neutral molecular marker (FST) differentiation in all cases, arguing that diversifying selection has contributed to shaping broad-scale patterns of genetic differentiation. Most inter-trial genetic correlations were close to one at the subrace and additive genetic levels, indicating that the genetic variation in this important developmental change is expressed in a stable manner and that genotype-by-environment interaction is minimal across the environments studied.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Hamilton, MG (Dr Matthew Hamilton)
UTAS Author:Tilyard, PA (Mr Paul Tilyard)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:72194
Year Published:2011
Web of Science® Times Cited:17
Deposited By:Plant Science
Deposited On:2011-08-23
Last Modified:2018-03-28
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