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Root : shoot ratios, optimization and nitrogen productivity.

Göran I Agren1, Oskar Franklin

  • 1Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences, PO Box 7072, SE-750 07 Uppsala, Sweden. Goran.Agren@eom.slu.se

Annals of Botany
|October 21, 2003
PubMed
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Plants adjust root:shoot ratios based on nitrogen. Including maintenance respiration in models significantly improved predictions of plant growth, aligning better with experimental data for birch and tomato.

Area of Science:

  • Plant physiology
  • Ecology
  • Mathematical modeling

Background:

  • Plants alter root:shoot ratios in response to nitrogen availability.
  • The hypothesis suggests plants maximize relative growth rate for optimal resource allocation.

Purpose of the Study:

  • To investigate plant root:shoot allocation using mathematical models.
  • To assess the impact of maintenance respiration on growth predictions.

Main Methods:

  • Formulated two models for root:shoot allocation: one without and one with maintenance respiration.
  • Incorporated relative growth rate as a linear function of plant nitrogen concentration.
  • Compared model predictions with experimental growth data for birch and tomato.

Main Results:

Related Experiment Videos

  • The model without respiration provided qualitatively reasonable predictions.
  • Explicitly including maintenance respiration significantly improved the agreement between model predictions and experimental observations.
  • For birch, predictions with respiration were within experimental accuracy.

Conclusions:

  • Maintenance respiration is crucial for accurately modeling plant root:shoot allocation.
  • Further refinements require detailed descriptions of respiratory processes and nitrogen uptake.
  • Under extreme nutrient stress, plants may optimize for variables beyond relative growth rate.