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The impact of flower density and irrigation on capsule and seed set in Eucalyptus globulus seed orchards

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Abstract

Low capsule set is a major factor limiting the productivity of Eucalyptus globulus seed orchards. This study tested the effect of flower density, as well as two common irrigation techniques on capsule and seed set. Ramets with high flower density had significantly lower capsule set (69.7%) than those with low flower density (81.7%). In a regulated deficit irrigation trial, the non-irrigated ramets set a higher proportion of capsules (63.6%) than the ramets that received conventional irrigation (CI) (51.4%). In a partial root zone drying (PRD) trial, capsule set was highest in the absence of irrigation (74.7%) followed by the PRD treatment (67.8%) and then CI (53.7%). The CI treatment tended to produce the highest number of seed per capsule. Increased water availability resulted in increased vegetative growth, which was associated with higher levels of abortion in developing capsules but those surviving tended to have higher seed set. It is argued that the observed effects of irrigation and flower density can be explained by resource competition between vegetative and reproductive growth as well as competition among reproductive structures themselves.

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Acknowledgments

This research was funded by Seed Energy Pty Ltd and an Australian Postgraduate Award to S. Suitor. We thank Rod Griffin, Jane Harbard, Penny Measham and Richard Doyle for their assistance.

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Authors and Affiliations

  1. Tasmanian Institute of Agricultural Research, School of Agricultural Science, University of Tasmania, Private Bag 54, Hobart, TAS, 7001, Australia

    S. Suitor, P. H. Brown, A. J. Gracie & K. D. Rix

  2. School of Plant Science, Cooperative Research Centre for Forestry, University of Tasmania, Private Bag 55, Hobart, TAS, 7001, Australia

    B. M. Potts

  3. SeedEnergy, Pty Ltd, Private Bag 55, Hobart, TAS, 7001, Australia

    P. L. Gore

Authors
  1. S. Suitor
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  2. B. M. Potts
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  3. P. H. Brown
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  4. A. J. Gracie
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  5. K. D. Rix
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  6. P. L. Gore
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Correspondence to S. Suitor.

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Suitor, S., Potts, B.M., Brown, P.H. et al. The impact of flower density and irrigation on capsule and seed set in Eucalyptus globulus seed orchards. New Forests 39, 117–127 (2010). https://doi.org/10.1007/s11056-009-9159-2

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  • DOI: https://doi.org/10.1007/s11056-009-9159-2

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