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Cyanogenic polymorphism in Eucalyptus polyanthemos Schauer subsp. vestita L. Johnson and K. Hill (Myrtaceae)
Ist Teil von
Biochemical systematics and ecology, 2002-07, Vol.30 (7), p.617-630
Ort / Verlag
Elsevier Ltd
Erscheinungsjahr
2002
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Plant cyanogenesis, the release of cyanide from endogenous cyanide-containing compounds, is an effective herbivore deterrent. This paper characterises cyanogenesis in the Australian tree
Eucalyptus polyanthemos Schauer subsp.
vestita L. Johnson and K. Hill for the first time. The cyanogenic glucoside prunasin ((R)-mandelonitrile β-D-glucoside) was determined to be the only cyanogenic compound in
E. polyanthemos foliage. Two natural populations of
E. polyanthemos showed quantitative variation in foliar prunasin concentration, varying from zero (i.e. acyanogenic) to 2.07 mg CN g
-1 dry weight in one population and from 0.17 to 1.98 mg CN g
-1 dry weight in the other. No significant difference was detected between the populations with respect to the mean prunasin concentration or the degree of variation in foliar prunasin, despite significant differences in foliar nitrogen. Variation between individuals was also observed with respect to the capacity of foliage to catabolise prunasin to form cyanide. Moreover, variation in this capacity generally correlated with the amount of prunasin in the tissue, suggesting genetic linkage between prunasin and β-glucosidase.