Embryology and phylogeny of glucosinolate-producing plants.

点击翻译按钮获取中文摘要

Fifteen families are known to produce myrosin or glucosinolates in angiosperms, and they include Brassicaceae, Capparaceae, Moringaceae, Salvadoraceae, Euphorbiaceae (Drypetes only). Their phylogenetic relationships have been uncertain. In the present research project I presented embryology of various plant groups whose information are still lacking and, on the basis of embryological evidence, discuss relationships among and within them. New embryological information and/or new findings are summarized as follows. (1)Canotia is not closely related to Koebelinia which has myrosin cells and has often discussed together with Canotia, and is rather at home within Celastrales. (2)Salvadoraceae have no seed structure that fits in with that of any of the other glucosinolate-producing families. (3)Macgregoria, which has been suggested as one of candidates having close relationships to the glucosinolate-producing families, is well at home in Stackhousiaceae which has no gluosinolates. (4)A glucosinolate-producing genus Drypetes (including Liodendron) and a non-glucosinolate-producing genus Poranthera both are well suitable in Euphorbiaceae embryologically.In conclusion, even if 14 glucosinolate-producing families (excluding Euphorbiaceae) are monophyletic as indicated by macromolecular evidence, embryological characters like many other morphological or taxonomical characters have evolved towards diverse directions.