Novel aspects of cyanogenesis in Eucalyptus camphora subsp. humeana

Functional Plant Biology : FPB
Elizabeth H NeilsonIan E Woodrow

Abstract

Cyanogenesis is the release of cyanide from certain organisms upon tissue disruption. Tissue disruption, such as that caused by folivory, brings cyanogenic glycosides into contact with catabolic enzymes and toxic HCN is subsequently released. The process provides a measure of defence against generalist herbivores. Within the genus Eucalyptus, several species have been identified as cyanogenic and all of these store cyanide exclusively in the form of the cyanogenic glycoside prunasin. Here we report for the first time cyanogenesis in Eucalyptus camphora subsp. humeana L.A.S. Johnson & K.D. Hill. We found that foliage contains at least five different cyanogenic glycosides, three of which were purified and identified (prunasin, sambunigrin and amygdalin). Two natural populations of E. camphora trees were screened for cyanogenesis, and quantitative polymorphism was measured at both sites. Trees varied in their capacity for cyanogenesis from 0.014 to 0.543 mg CN g-1 DW in one population and from 0.011 to 0.371 mg CN g-1 DW in the other. A progeny trial, testing both cyanogenesis and carbon-based defence (namely total phenolics and condensed tannins), was performed with seed sourced from two cyanogenic, open-pollinated maternal trees...Continue Reading

References

Feb 7, 1998·Phytochemistry·D A Jones
Aug 30, 2002·Journal of Chemical Ecology·Roslyn M Gleadow, Ian E Woodrow
Sep 3, 2002·Tree Physiology·Roslyn M Gleadow, Ian E Woodrow
Mar 26, 2003·Tree Physiology·Roslyn M. Gleadow, Ian E. Woodrow
Jul 18, 2003·Journal of Experimental Botany·Nathaniel J DominyS Joseph Wright
Jan 31, 2004·Phytochemistry·Mika ZagrobelnyBirger Lindberg Møller
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Oct 1, 1990·Plant Physiology·J E Poulton
May 17, 2006·Trends in Ecology & Evolution·Karina Boege, Robert J Marquis
Jan 1, 2002·Functional Plant Biology : FPB·Jason Q D Goodger, Ian E Woodrow
Jun 1, 2004·Functional Plant Biology : FPB·Rebecca E MillerIan E Woodrow
Jan 1, 2002·Functional Plant Biology : FPB·Ian E WoodrowRoslyn M Gleadow

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Citations

Oct 15, 2013·The New Phytologist·Ben D MooreWilliam J Foley
Mar 21, 2008·Phytochemistry·Mika ZagrobelnyBirger Lindberg Møller
May 14, 2008·Phytochemistry·Roslyn M GleadowEric E Conn

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