At least two different signalling pathways have been identified that result in clearly distinguishable volatile profiles in response to pathogens and herbivores in the lima bean Phaseolus lunatus. Alamethicin, a voltage-gated ion-channel-forming peptide from Trichoderma viride is a potent inducer of volatile biosynthesis in the lima bean. Unlike elicitation with cellulysin or herbivore damage, which act through the jasmonic acid pathway and result in a complex pattern of volatile compounds, the emitted blend comprises only the two homoterpens, 4,11-dimethylnona-1,3,7-triene and 4,8,12-trimethyltrideca-1,3,7,11- tetraene, and methyl salicylate. Both pathways, represented by jasmonic acid and alamethicin, depend on lipid-derived signalling compounds, set off by the activation of a phospholipase A and further processing by lipoxygenase activity. The alamethicin-induced signal-transduction pathway interferes with the octadecanoid cascade, probably due to increased salicylic acid levels, resulting in an inhibition of the typical jasmonic acid-induced volatile profile.
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Conference Article|
December 01 2000
Differential signalling and plant-volatile biosynthesis
J. Engelberth
J. Engelberth
1
1Max Planck Institute of Chemical Ecology, Department of Bioorganics, Carl Zeiss Promenade 10, 07745 Jena, Germany
1E-mail engelberth@ice.mpgde
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Publisher: Portland Press Ltd
Received:
June 26 2000
Online ISSN: 1470-8752
Print ISSN: 0300-5127
© 2000 Biochemical Society
2000
Biochem Soc Trans (2000) 28 (6): 871–872.
Article history
Received:
June 26 2000
Citation
J. Engelberth; Differential signalling and plant-volatile biosynthesis. Biochem Soc Trans 1 December 2000; 28 (6): 871–872. doi: https://doi.org/10.1042/bst0280871
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