COSE · AstroBotany · in-silico tropisms

⇄ v1 vs v2 vs v3 vs v4 root architecture

Model version: v1 (original) v2 (calibrated) v3 (gradient) v4 (EMF) compare

Compare different generations of the seed sowing simulation software. Analyze their behavior across global sweeps vs. real cotton reference data, or interactively witness their growth responses side-by-side in real time.

Trait-space overlay: simulations vs. real

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real stereotype archetype real TICTOC cotton root v1 simulated v2 simulated v3 simulated v4 simulated

Left: tortuosity vs lateral fraction. Right: branch count vs mean lateral angle. Axes are scale-free — see MANUSCRIPT.md Methods.

Trait mean ± SD: simulations vs. real

The key metric is the **spread (SD)**. Deterministic models (v1) lock into a narrow morphological profile (SD ≈ 0) regardless of the environmental sweep, while stochastic models (v2, v3, v4) capture the natural biological spread.

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v1 (Original)

v2 (Calibrated)

v3 (Environmental Gradients)

v4 (Electromagnetic Fields)

Model Version Comparison Matrix

Feature v1 (Original) v2 (Calibrated) v3 (Gradients) v4 (EMF)
**Branching Trigger** Deterministic: fires on ≥45° polyline bends or at 2/3 root length. Stochastic: log-normal inter-branch gap intervals. Stochastic: log-normal inter-branch gap intervals. Stochastic: log-normal inter-branch gap intervals.
**Lateral Angles** Fixed: parent-angle + 45° always to one side. Alternating: Normal(78.8°, 25° SD). Alternating: Normal(78.8°, 25° SD). Alternating: Normal(78.8°, 25° SD).
**Gravitropism Curve** Linear ramp, hard clamp at mag ≥ 3. Saturating dose-response piecewise curves (auxin-asymmetry). Saturating dose-response piecewise curves (auxin-asymmetry). Saturating dose-response piecewise curves (auxin-asymmetry).
**Directional Noise** None: completely deterministic. Gaussian noise: amplified at microgravity (×1.13). Gaussian noise: amplified at microgravity (×1.13). Gaussian noise: amplified at microgravity (×1.13).
**Petri Dish Shapes** Circular only. Circular only. Circular & Square geometry. Circular & Square geometry.
**Osmotic Gradients & Hydrotropism** None. None. Negative hydrotropic steering away from solute peaks; growth rate reduction. Negative hydrotropic steering away from solute peaks; growth rate reduction.
**Electric Fields (Galvanotropism)** None. None. None. Electrotropic cathode attraction, high-intensity growth inhibition.
**Magnetic Fields (Magnetotropism)** None. None. None. Diamagnetic Statocyte repulsion (local HGMF) & alignment (uniform B-field).