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Two Algorithms for High-throughput and Multi-parametric Quantification of Drosophila Neuromuscular Junction Morphology

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Published on: May 3, 2017

Noise and robustness in phyllotaxis.

Vincent Mirabet¹, Fabrice Besnard, Teva Vernoux

¹Laboratoire Joliot-Curie, CNRS, ENS, Université de Lyon, Lyon, France.

Plos Computational Biology

|February 24, 2012

Summary

This summary is machine-generated.

Stochastic variability in plants can cause defects in spiral phyllotaxis. A new model reveals how secondary fields help maintain robust organ arrangement despite this noise.

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Area of Science:

Plant biology
Developmental biology
Mathematical modeling

Background:

Vascular plants exhibit phyllotaxis, a regular arrangement of lateral organs on stems, often described by Fibonacci numbers and the golden angle.
Previous models focused on deterministic self-organization of inhibitory fields, primarily mediated by auxin transport, to explain phyllotaxis.
Natural stochastic variability in organisms raises questions about its impact on achieving regular phyllotactic patterns.

Purpose of the Study:

To theoretically investigate the effect of stochastic variability on phyllotaxis using a dynamical system model.
To identify defects in spiral phyllotaxis caused by stochasticity and explore the role of secondary inhibitory fields in mitigating these defects.

Main Methods:

Developed a dynamical system model of interacting sources of inhibitory fields, incorporating stochasticity.
Analyzed the emergence of phyllotactic patterns and defects under simulated natural variability.
Investigated the filtering effect of a secondary inhibitory field on phyllotactic defects.

Main Results:

Identified three main classes of defects in spiral phyllotaxis: reversed spiral handedness, concomitant organ initiation, and distichous angles.
Demonstrated that a secondary inhibitory field can filter out these defects, contributing to pattern robustness.
Results align with existing experimental data and predict key sources of stochasticity during organogenesis.

Conclusions:

Stochastic variability introduces defects into phyllotaxis, but secondary fields are crucial for maintaining robust organ arrangement.
The model provides a framework for analyzing phyllotactic mutants at cellular and tissular levels.
Biochemical signals and mechanical forces acting as secondary fields are proposed to be important for phyllotaxis robustness.