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Ontogenetic and temporal trajectories of chemical defence in a cyanogenic eucalypt

  • Ecophysiology
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Abstract

Many studies have shown that similarly aged plants within a species or population can vary markedly in the concentration of defence compounds they deploy to protect themselves from herbivores. Some studies have also shown that the concentration of these compounds can change with development, but no empirical research has mapped such an ontogenetic trajectory in detail. To do this, we grew cyanogenic Eucalyptus yarraensis seedlings from three half-sibling families under constant glasshouse conditions, and followed their foliar cyanogenic glycoside (prunasin) concentration over time for 338 days after sowing (DAS). Plants in all families followed a similar temporal pattern. Plants increased in foliar prunasin concentration from a very low level (10 μg cyanide (CN) equivalents g−1) in their first leaves, to a maximum of, on average, 1.2 mg CN g−1 at about 240 DAS. From 240 to 338 DAS, prunasin concentration gradually decreased to around 0.7 mg CN g−1. Significant differences between families in maximum prunasin concentration were detected, but none were detected in the time at which this maximum occurred. In parallel with these changes in prunasin concentration, we detected an approximately linear increase in leaf mass per unit leaf area (LMA) with time, which reflected a change from juvenile to adult-like leaf anatomy. When ontogenetic trajectories of prunasin against LMA were constructed, we failed to detect a significant difference between families in the LMA at which maximum prunasin concentration occurred. This remarkable similarity in the temporal and ontogenetic trajectories between individuals, even from geographically remote families, is discussed in relation to a theoretical model for ontogenetic changes in plant defence. Our results show that ontogeny can constrain the expression of plant chemical defense and that chemical defense changes in a nonlinear fashion with ontogeny.

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Authors and Affiliations

  1. School of Botany, The University of Melbourne, Melbourne, VIC, 3010, Australia

    Jason Q. D. Goodger, Thereis Y. S. Choo & Ian E. Woodrow

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  1. Jason Q. D. Goodger
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  2. Thereis Y. S. Choo
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  3. Ian E. Woodrow
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Correspondence to Jason Q. D. Goodger.

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Communicated by Katrin Rudmann.

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Goodger, J.Q.D., Choo, T.Y.S. & Woodrow, I.E. Ontogenetic and temporal trajectories of chemical defence in a cyanogenic eucalypt. Oecologia 153, 799–808 (2007). https://doi.org/10.1007/s00442-007-0787-y

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  • DOI: https://doi.org/10.1007/s00442-007-0787-y

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