Abstract
The mechanical actions of the fungus Magnaporthe grisea raise many intriguing questions concerning the forces involved. These include: (1) the material properties of the appressorial wall; (2) the strength of the adhesive that keeps the appressorium anchored to the rice leaf surface; and (3) the forces involved in the penetration process whereby a peg is driven through the host cell wall. In this paper we give order of magnitude estimates for all three of these quantities. A simple Young-Laplace law type argument is used to show that the appressorial wall elastic modulus is of order 10-100 MPa; and an adaptation of standard adhesion theory indicates a lower bound on the strength of the appressorial adhesive to be of the order 500 J/m2. Drawing on ideas from plasticity theory and ballistics, estimates of the penetration force raise interesting questions about experiments performed on the penetration of inert substrates by the fungus.
Original language | English (US) |
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Pages (from-to) | 755-759 |
Number of pages | 5 |
Journal | Mycological Research |
Volume | 110 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2006 |
Externally published | Yes |
Keywords
- Adhesive energy
- Elastic modulus
- Penetration force
- Yield stress
ASJC Scopus subject areas
- Biotechnology
- Ecology, Evolution, Behavior and Systematics
- Genetics
- Plant Science