Flavonoid chemistry ofBlennospermatinae, a trans-Pacific disjunct subtribe ofSenecioneae (Asteraceae) |
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Authors: | Ulf Swenson Ji Yang Yong Bruce A Bohm |
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Institution: | (1) Department of Systematic Botany, Uppsala University, Villavägen 6, 752 36, S-Uppsala;(2) Present address: Department of Systematic Botany, Lund University, Östra Vallgatan 18-20, S-223 61 Lund, Sweden;(3) Department of Botany, University of British Columbia, V6T 1Z4 Vancouver, Canada |
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Abstract: | The flavonoid profiles of seven species ofAbrotanella and one species ofIschnea have been shown to be based upon kaempferol 3- and quercetin 3-O-glycosides and a delphinidin glycoside. Glucosides, glucuronides, arabinosides, diglucosides, and rutinosides of the flavonols were identified. The profile ofIschnea consisted solely of quercetin 3-O-glucoside and 3-O-arabinoside whereas the profiles of theAbrotanella species were more varied. Although infraspecific variation was not investigated in this study, the flavonoid chemistry of the two genera is in accordance with the flavonoid variation described for other members ofSenecioneae which are primarily flavonol producers. Based on the known phylogeny and biogeography, the flavonoid distribution from the perspective of long-distance dispersals across the Pacific is discussed. Such events should lead to genetic bottle-neck situations and depauperate flavonoid profiles. A summary of current flavonoid knowledge in theSenecioneae is supplied. |
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Keywords: | Asteraceae Senecioneae Blennospermatinae Abrotanella Blennosperma Crocidium Ischnea Flavonoids phytogeography disjunct pacific |
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