The filamentary fungus Phycomyces blakesleeanus undergoes a series of remarkable transitions during aerial growth. During what is known as the stagea IV growth phase, the fungus extends while rotating in a counterclockwise manner when viewed from above (stagea IVa) and then, while continuing to grow, spontaneously reverses to a clockwise rotation (stagea IVb). This phase lasts for 24-48Ah and is sometimes followed by yet another reversal (stageAIVc) before the overall growth ends. Here, we propose a continuum mechanical model of this entire process using nonlinear, anisotropic, elasticity and show how helical anisotropy associated with the cell wall structure can induce spontaneous rotation and, under appropriate circumstances, the observed reversal of rotational handedness. © 2011 American Physical Society.
|Original language||English (US)|
|Journal||Physical Review Letters|
|State||Published - Mar 31 2011|
Bibliographical noteKAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUK-C1-013-04
Acknowledgements: This publication is based in part upon work supported by the National Science Foundation under Grant No. DMS-0907773 and by Grant No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST) (A. G.). A. G. is supported through a Wolfson/Royal Society Merit Award.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.