Proceedings of the National Academy of Sciences of the United States of America (2014) 111, 105-110

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Dirk Hölscher, Suganthagunthalam Dhakshinamoorthy, Theodore Alexandrov, Michael Becker, Tom Bretschneider, Andreas Buerkert, Anna C. Crecelius, Dirk de Waele, Annemie Elsen, David G. Heckel, Heike Heklau, Christian Hertweck et al. (2014)
Phenalenone-type phytoalexins mediate resistance of banana plants (Musa spp.) to the burrowing nematode Radopholus similis
Proceedings of the National Academy of Sciences of the United States of America 111 (1), 105-110
Abstract: The global yield of bananas-one of the most important food crops-is severely hampered by parasites, such as nematodes, which cause yield losses up to 75%. Plant-nematode interactions of two banana cultivars differing in susceptibility to Radopholus similis were investigated by combining the conventional and spatially resolved analytical techniques 1H NMR spectroscopy, matrix-free UV-laser desorption/ionization mass spectrometric imaging, and Raman microspectroscopy. This innovative combination of analytical techniques was applied to isolate, identify, and locate the banana-specific type of phytoalexins, phenylphenalenones, in the R. similis-caused lesions of the plants. The striking antinematode activity of the phenylphenalenone anigorufone, its ingestion by the nematode, and its subsequent localization in lipid droplets within the nematode is reported. The importance of varying local concentrations of these specialized metabolites in infected plant tissues, their involvement in the plant's defense system, and derived strategies for improving banana resistance are highlighted.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Dirk de Waele, David G. Heckel

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Radopholus similis Banana/plantain (Musa) Uganda