Abstract
Plant defences can incur allocation costs and such costs incurred early in ontogeny may result in opportunity costs with effects evident later in life. A unified understanding of the growth cost of defence requires the identification of plants with varying ontogenetic trajectories of preferably resource demanding defences and an appropriate measurement of the growth cost of these defences. To develop such tools, we first compared nitrogen-based chemical defence (cyanogenic glycosides) in juvenile and adult foliage of three species of Eucalyptus (Myrtaceae). We found marked differences between the species, with two having much lower concentrations of foliar cyanogenic glycosides in seedlings compared to adults. We next used seedlings of two species to measure the resource (nitrogen) and growth cost of deploying cyanogenic glycosides. We found evidence that for every 1.0 nitrogen invested in cyanogenic glycosides, 1.49 additional nitrogens were effectively added to the leaves. We also found that deployment of cyanogenic glycosides was associated with a reduction in net assimilation rate (NAR) at constant leaf nitrogen. We did not, however, detect an overall growth cost associated with cyanogenic glycoside deployment because the rise in leaf nitrogen associated with this deployment apparently counteracted the reduction in NAR.
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Abbreviations
- CNA :
-
Leaf cyanide per unit leaf area
- CNm :
-
Leaf cyanide per unit leaf mass
- CN-N/N:
-
Cyanide–nitrogen as a proportion of total leaf nitrogen
- Ec :
-
Eucalyptus cladocalyx
- Ep :
-
E. polyanthemos
- Ey :
-
E. yarraensis
- LAR:
-
Leaf area ratio
- LMA:
-
Leaf mass per unit leaf area
- LL:
-
Leaf longevity
- LNP:
-
Leaf nitrogen productivity
- LWR:
-
Leaf weight ratio
- NA :
-
Total leaf nitrogen per unit leaf area
- NAR:
-
Net assimilation rate
- NCN-A :
-
Nitrogen in cyanide on a leaf area basis
- NM :
-
Total leaf nitrogen per unit leaf mass
- RGR:
-
Relative growth rate
- SLA:
-
Specific leaf area
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Acknowledgements
We thank Mr. Barry Smith of the Glenville Stud, South Australia, for access to trees on private land. The Department of Natural Resources and Environment, Victoria, provided permits to take protected flora (#10001252) and for fieldwork in Brisbane Ranges National Park, Victoria (#10000781). This research was supported by funds from an Australian Research Council Grant to IEW and in part by the Holsworth Wildlife Research Fund (Victorian Community Foundation, ANZ Charitable Trusts). JQDG was a recipient of an Australian Postgraduate Award Scholarship.
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Goodger, J.Q.D., Gleadow, R.M. & Woodrow, I.E. Growth cost and ontogenetic expression patterns of defence in cyanogenic Eucalyptus spp.. Trees 20, 757–765 (2006). https://doi.org/10.1007/s00468-006-0090-2
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DOI: https://doi.org/10.1007/s00468-006-0090-2