Gleadow Roslyn M, Haburjak J, Dunn J E, Conn M E, Conn Eric E
School of Biological Sciences, Monash University, Victoria 3800, Australia.
Phytochemistry. 2008 Jun;69(9):1870-4. doi: 10.1016/j.phytochem.2008.03.018. Epub 2008 May 10.
In this study approximately 420 of the described species of Eucalyptus were examined for cyanogenesis. Our work has identified an additional 18 cyanogenic species, 12 from living tissues and a further six from herbarium samples. This brings the total of known cyanogenic species to 23, representing approximately 4% of the genus. The taxonomic distribution of the species within the genus is restricted to the subgenus Symphyomyrtus, with only two exceptions. Within Symphyomyrtus, the species are in three closely related sections. The cyanogenic glycoside was found to be predominantly prunasin (1) in the 11 species where this was examined. We conclude that cyanogenesis is plesiomorphic in Symphyomyrtus (i.e. a common basal trait) but has probably arisen independently in the other two subgenera, consistent with recent phylogenetic treatments of the genus. The results of this study have important implications for the selection of trees for plantations to support wildlife, and to preserve genetic diversity.
在本研究中，对约420种已描述的桉属物种进行了氰化物生成检测。我们的工作又鉴定出18种产氰物种，其中12种来自活体组织，另外6种来自标本馆样本。这使得已知产氰物种总数达到23种，约占该属的4%。该属内物种的分类分布仅限于共生桉亚属，仅有两个例外。在共生桉亚属中，这些物种分属于三个亲缘关系密切的组。在所检测的11个物种中，发现主要的氰苷为扁桃苷（1）。我们得出结论，氰化物生成在共生桉亚属中是原始性状（即一个常见基部性状），但可能在其他两个亚属中独立出现，这与该属最近的系统发育研究结果一致。本研究结果对于选择人工林树木以支持野生动物和保护遗传多样性具有重要意义。
