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Related Experiment Video

Updated: Sep 12, 2025

Kinematic Analysis of Cell Division and Expansion: Quantifying the Cellular Basis of Growth and Sampling Developmental Zones in Zea mays Leaves

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Do Developing Plant Branches Conform to a Single Allometric Growth Rule?

Charles A Price^1,2, Jacob S Suissa¹

¹Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee, USA.

Plant, Cell & Environment

|August 7, 2025

Summary

Physical models help predict plant growth. A new flow similarity model accurately predicts terminal stem allometry in seed plants across diverse species and evolutionary timescales.

Keywords:

allometry biomechanics elastic similarity flow similarity geometric similarity hydraulics scaling

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Last Updated: Sep 12, 2025

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Area of Science:

Plant biology
Ecology
Evolutionary biology

Background:

Biologists use physical models to understand organismal growth patterns.
Previous models for tree branching often assume self-similarity and single physical constraints.
The flow similarity model predicts distinct allometry for terminal branches based on hydraulic principles.

Purpose of the Study:

To evaluate the flow similarity model's predictions for terminal stem growth in seed plants.
To assess the variation and evolutionary stability of terminal stem allometry across diverse species.

Main Methods:

Studied terminal stem dimensions of 52 woody plant species.
Covered a wide range of stem volumes (four orders of magnitude).
Employed phylogenetic analysis to examine evolutionary trends and selection pressures.

Main Results:

Terminal stem allometry showed limited variation across seed plant lineages, despite extensive divergent evolution.
Phylogenetic analysis indicated stable trait means and a strong tendency towards specific allometric values.
Observed mean values closely aligned with the predictions of the flow similarity model.

Conclusions:

Terminal stem ontogeny in seed plants adheres to consistent allometric scaling principles.
These principles operate across both evolutionary and ecological scales.
The findings support the flow similarity model and suggest stabilizing selection on stem allometry.