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April 2012

The spores of Colletotrichum higginsianum germinate on plant surfaces to produce highly specialized cells called appressoria with thick, darkly melanized cell walls. Long-recognized as organs of attachment and penetration, appressoria also function in the focal delivery of secreted effector proteins (see Kleemann et al., doi: 10.1371/journal.ppat.1002643). Transmission electron microscopy reveals a needle-like penetration hypha emerging from a nanoscale pore (200 nm diameter) in the base of the appressorium to puncture the plant cuticle and cell wall.

Image Credit: Richard O'Connell, Max Planck Institute for Plant Breeding Research, Cologne

Opinion

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Pearls

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Reviews

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