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Acta Physiologiae Plantarum

, Volume 35, Issue 12, pp 3277–3284 | Cite as

How do expansins control plant growth? A model for cell wall loosening via defect migration in cellulose microfibrils

  • Andrei LipchinskyEmail author
Review

Abstract

Expansins are plant cell wall-loosening proteins that promote cell growth and are essential for many critical developmental processes and stress responses. The molecular basis for expansin action is uncertain. Recently, it has been proposed that expansins loosen the wall by means of the generation of mobile conformational defects at the surface of cellulose microfibrils. The present work addresses this hypothesis by elaborating three assumptions: (1) microfibril–matrix interfaces cause steep stress gradients on the microfibril surface, (2) stress gradients drive the motion of conformational defects along the microfibril surface toward the microfibril–matrix interfaces, and (3) the approach of the defects to the microfibril–matrix interfaces facilitates the dissociation of matrix polysaccharides from cellulose microfibrils.

Keywords

Expansin Extension growth Cellulose microfibril Plant cell wall 

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2013

Authors and Affiliations

  1. 1.Department of Plant Physiology and BiochemistrySaint Petersburg State UniversitySaint PetersburgRussia

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