Cyanogenesis in the Australian tropical rainforest endemic Brombya platynema (Rutaceae): chemical characterisation and polymorphism

Functional Plant Biology : FPB
Rebecca E MillerIan E Woodrow

Abstract

This study examined two aspects of cyanogenesis in Brombya platynema F. Muell. (Rutaceae), a subcanopy tree endemic to tropical rainforest in far north Queensland, Australia. First, cyanogenic glycosides in foliage were fractionated and identified. The rare meta-hydroxylated cyanogenic glycoside, holocalin, was identified as the principal cyanogen, and traces of prunasin and amygdalin were detected. This is the first characterisation of cyanogenic constituents within the genus, and to the authors' knowledge, only the third within the Rutaceae, and the order Rutales. Second, variation in cyanogenic glycoside content within a population of B. platynema in lowland tropical rainforest was quantified. Both qualitative and quantitative polymorphism for cyanogenesis was identified. Interestingly, ~57% of individuals were considered acyanogenic, with concentrations of cyanogenic glycosides less than 8 μg CN g-1 DW. Among cyanogenic individuals there was substantial quantitative variation in cyanogenic glycoside concentration, which varied from 10.5 to 1285.9 μg CN g-1 DW. This high frequency of acyanogenic individuals is contrasted with the apparent absence of the acyanogenesis among populations of other tropical rainforest tree specie...Continue Reading

References

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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
May 1, 2006·Functional Plant Biology : FPB·Elizabeth H NeilsonIan E Woodrow
Jan 1, 2002·Functional Plant Biology : FPB·Ian E WoodrowRoslyn M Gleadow

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Citations

Mar 8, 2006·Annals of Botany·Rebecca E MillerIan E Woodrow
Mar 4, 2014·Annual Review of Plant Biology·Roslyn M Gleadow, Birger Lindberg Møller
May 1, 2006·Functional Plant Biology : FPB·Elizabeth H NeilsonIan E Woodrow

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