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Analyzing growth components in trees.

Yann Guédon1, Yves Caraglio, Patrick Heuret

  • 1CIRAD, UMR DAP and INRIA, Virtual Plants, TA A-96/02, 34398 Montpellier Cedex 5, France. guedon@cirad.fr

Journal of Theoretical Biology
|July 17, 2007
PubMed
Summary
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Plant growth is shaped by internal (ontogenetic) and external (environmental) factors. This study suggests plant development follows distinct phases rather than a simple trend, revealing new insights into plant biology.

Area of Science:

  • Plant Biology
  • Developmental Biology
  • Quantitative Biology

Background:

  • Plant growth along an axis is influenced by ontogenetic and environmental factors.
  • The structure of the ontogenetic component (trend vs. phases) remains an open question.

Purpose of the Study:

  • To investigate the structure of the ontogenetic component of plant growth.
  • To differentiate between growth trends and successional phases.
  • To characterize ontogenetic and environmental growth components.

Main Methods:

  • Exploratory analysis: symmetric smoothing filters, sample autocorrelation functions.
  • Statistical modeling: multiple change-point models, hidden semi-Markov chains, hidden hybrid models.
  • Analysis of contrasted plant growth examples.

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Main Results:

  • Evidence favors an ontogenetic component structured as a succession of stationary phases.
  • High-magnitude phase changes were identified even when overall growth decreased.
  • Distinction between ontogenetic and environmental influences on plant growth was clarified.

Conclusions:

  • Plant development along an axis is better described as a series of distinct phases.
  • This phase-based model offers a new perspective on botanical concepts like 'phase change' and 'morphogenetic gradient'.