Survival of the aligned: ordering of the plant cortical microtubule array

Abstract

The cortical array is a structure consisting of highly aligned microtubules which plays a crucial role in the characteristic uniaxial expansion of all growing plant cells. Recent experiments have shown polymerization-driven collisions between the membrane-bound cortical microtubules, suggesting a possible mechanism for their alignment. We present both a coarse-grained theoretical model and stochastic particle-based simulations of this mechanism, and compare the results from these complementary approaches. Our results indicate that collisions that induce depolymerization are sufficient to generate the alignment of microtubules in the cortical array.

4+ pages, 3 figures v2: significantly revised the exposition of the analytical model and expanded the discussion on our choice for the collision outcome probabilities; clarified the scope of the conclusions; numerous smaller changes throughout

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