A biomechanical model of anther opening reveals the roles of dehydration and secondary thickening

M.R. Nelson, L.R. Band, Rosemary Dyson, T. Lessinnes, D.M. Wells, C. Yang, N.M. Everitt, O.E. Jensen, Z.A. Wilson

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Understanding the processes that underlie pollen release is a prime target for controlling fertility to enable selective breeding and the efficient production of hybrid crops. Pollen release requires anther opening, which involves changes in the biomechanical properties of the anther wall. In this research, we develop and use a mathematical model to understand how these biomechanical processes lead to anther opening.

Our mathematical model describing the biomechanics of anther opening incorporates the bilayer structure of the mature anther wall, which comprises the outer epidermal cell layer, whose turgor pressure is related to its hydration, and the endothecial layer, whose walls contain helical secondary thickening, which resists stretching and bending. The model describes how
epidermal dehydration, in association with the thickened endothecial layer, creates forces within the anther wall causing it to bend outwards, resulting in anther opening and pollen release.

The model demonstrates that epidermal dehydration can drive anther pening, and suggests why endothecial secondary thickening is essential for this process (explaining the phenotypes presented in the myb26 and nst1nst2 mutants).

The research hypothesizes and demonstrates a biomechanical mechanism for anther opening, which appears to be conserved in many other biological situations where tissue movement occurs.
Original languageEnglish
Article number10.1111/j.1469-8137.2012.04329.x
Pages (from-to)1030-1037
Number of pages8
JournalNew Phytologist
Early online date21 Sept 2012
Publication statusPublished - Dec 2012


  • actuation
  • anther
  • biomechanical modelling
  • dehiscence
  • dehydration
  • secondary thickening


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