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Planta

, Volume 234, Issue 6, pp 1267–1274 | Cite as

Passive water control at the surface of a superhydrophobic lichen

  • Christopher A. E. Hamlett
  • Neil James ShirtcliffeEmail author
  • F. Brian Pyatt
  • Michael I. Newton
  • Glen McHale
  • Kerstin Koch
Original Article

Abstract

Some lichens have a super-hydrophobic upper surface, which repels water drops, keeping the surface dry but probably preventing water uptake. Spore ejection requires water and is most efficient just after rainfall. This study was carried out to investigate how super-hydrophobic lichens manage water uptake and repellence at their fruiting bodies, or podetia. Drops of water were placed onto separate podetia of Cladonia chlorophaea and observed using optical microscopy and cryo-scanning-electron microscopy (cryo-SEM) techniques to determine the structure of podetia and to visualise their interaction with water droplets. SEM and optical microscopy studies revealed that the surface of the podetia was constructed in a three-level structural hierarchy. By cryo-SEM of water-glycerol droplets placed on the upper part of the podetium, pinning of the droplet to specific, hydrophilic spots (pycnidia/apothecia) was observed. The results suggest a mechanism for water uptake, which is highly sophisticated, using surface wettability to generate a passive response to different types of precipitation in a manner similar to the Namib Desert beetle. This mechanism is likely to be found in other organisms as it offers passive but selective water control.

Keywords

Apothecium Cryo-SEM Lichens Soredium Super-hydrophobicity Water uptake 

Abbreviations

SEM

Scanning electron microscope

Cryo-

Cryogen, typically at liquid nitrogen temperature

Fps

Frames per second

Notes

Acknowledgments

The authors would like to thank H.J. Ensikat for technical assistance in SEM and performing of the cryo-preparation of the specimen, W. Barthlott for providing parts of the technical equipment for the studies performed at Bonn University (both Nees-Institut für Biodiversität der Pflanzen, Bonn University, Germany) and the EPSRC for funding NJS and CAEH under grants EP/E063489/1 and EP/H00704/1.

Conflict of interest

The authors declare that there are no conflicts of interest.

Supplementary material

425_2011_1475_MOESM1_ESM.pdf (222 kb)
Supplementary material 1 (PDF 222 kb)

Supplementary material 2 (MPG 9312 kb)

Supplementary material 3 (MPG 11420 kb)

Supplementary material 4 (MPG 12992 kb)

Supplementary material 5 (MPG 3480 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Christopher A. E. Hamlett
    • 1
  • Neil James Shirtcliffe
    • 1
    Email author
  • F. Brian Pyatt
    • 1
  • Michael I. Newton
    • 1
  • Glen McHale
    • 1
  • Kerstin Koch
    • 2
  1. 1.School of Science and TechnologyNottingham Trent UniversityNottinghamUK
  2. 2.Faculty of Life SciencesRhine Waal UniversityKleveGermany

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