Abstract
The allocation of plant internal resources to growth processes (primary metabolism) and to defensive compounds (secondary metabolism) is determined by plant internal competition for common substrates and energy. In order to contribute to the discussion about environmental impacts on this trade-off between demands for growth and defence, we extended a complex plant growth model to simulate the formation of defensive compounds on the whole plant level, depending on the dynamics of the environmental conditions light, nutrients and water. In this paper, we present and apply the model to simulate the effects of different N fertilizer applications on growth and resistance of young apple trees (cv “Golden Delicious”). The results show that model predictions are able to describe the observed relation between growth rate and phenylpropanoid concentrations in young leaves of apple trees, and can assist in the interpretation of experimental findings. Finally, we estimate costs and benefits of investment into defence in a scenario, in which an attack by the leaf pathogen Venturia inaequalis is simulated.
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Acknowledgements
The authors gratefully acknowledge support by the Deutsche Forschungsgemeinschaft “DFG” (SFB 607, Growth and Parasite Defence? Competition for Resources in Economic Plants from Forestry and Agronomy).
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Gayler, S., Leser, C., Priesack, E. et al. Modelling the effect of environmental factors on the “trade-off” between growth and defensive compounds in young apple trees. Trees 18, 363–371 (2004). https://doi.org/10.1007/s00468-003-0315-6
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DOI: https://doi.org/10.1007/s00468-003-0315-6