Division of Botany and Zoology, Australian National University, Canberra ACT 0200, Australia.
Am J Bot. 2001 Sep;88(9):1675-87.
Gastrolobium (Fabaceae: Mirbelieae) is an endemic Australian genus that produces toxic sodium monofluoroacetate. A phylogenetic reconstruction of Gastrolobium and the related genera Brachysema, Callistachys, Jansonia, Nemcia, Oxylobium, and Podolobium is presented, using sequence data from three regions-the psbA-trnH intergenic spacer and the trnK 5' intron from chloroplast DNA and the 3' end of the external transcribed spacer (ETS) from nuclear ribosomal DNA. Gastrolobium is shown to be paraphyletic, with Brachysema, Jansonia, Nemcia, and Oxylobium lineare nesting within it, and Nemcia is shown to be polyphyletic within Gastrolobium. Past key morphological characters, such as fluoroacetate content and characters associated with pollination syndrome, are shown to be homoplastic, with fluoroacetate possibly a plesiomorphic condition lost in more derived species. Podolobium is also shown to be polyphyletic, with the P. ilicifolium group sister to Gastrolobium and the P. alpestre group sister to Callistachys, a member of the Oxylobium group. It is recommended that Gastrolobium be expanded to include Brachysema, Jansonia, Nemcia, and Oxylobium lineare, while further work is required to test the sister-group relationship between Podolobium s.s. (sensu stricto) and Gastrolobium.
胃瓣豆属（豆科：Mirbelieae）是澳大利亚特有的一个属，能产生有毒的单氟乙酸钠。本研究利用来自叶绿体 DNA 的 psbA-trnH 基因间隔区和 trnK 5'内含子以及核核糖体 DNA 的 3'端的外部转录间隔区（ETS）的序列数据，重建了胃瓣豆属及其相关属 Brachysema、Callistachys、Jansonia、Nemcia、Oxylobium 和 Podolobium 的系统发育关系。结果表明胃瓣豆属为并系，Brachysema、Jansonia、Nemcia 和 Oxylobium lineare 嵌套在其中，Nemcia 属在胃瓣豆属中是多系的。过去的主要形态特征，如氟乙酸盐含量和与传粉综合征相关的特征，显示出同形性，氟乙酸盐可能是在更衍生的物种中失去的原始特征。Podolobium 也被证明是多系的，P. ilicifolium 组与 Gastrolobium 是姐妹群，P. alpestre 组与 Oxylobium 属的 Callistachys 是姐妹群。建议将 Gastrolobium 扩大到包括 Brachysema、Jansonia、Nemcia 和 Oxylobium lineare，而进一步的工作需要测试 Podolobium s.s.（狭义）与 Gastrolobium 之间的姐妹群关系。
