Nonpolar flavonoids of Wilkesia and Argyroxiphium

Bohm, Bruce A.; Fong, Charmaine

doi:10.1016/0031-9422(90)85423-d

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…The vacuolar flavonoid fraction of both species is dominated by quercetin 3-0-glucoside, 3-0-rutinoside, and patuletin 3-0-glucoside (Bohm, unpubl.). 5,7,3',6,7 ,7,7,3' ,3' ,7,7,7,3' ,3' ,7 , Data from Bohm and Fong (1990 from W. biflora (cited as Wedelia biflora; synonymy from Strother, 1991). Gardner (1976) stated that the flavonols of W. biflora were "virtually identical" to compounds present in the diploid species of Lipochaeta, which he showed to be glycosides of quercetin.…”

Section: Chjo~mentioning

confidence: 95%

“…Three of the genera, Argyroxiphium, Dubautia, and Wilkesia, are Hawaiian endemic genera, while the rest are primarily western North American. Flavonoid studies are not complete for the subtribe, but it is interesting to note the differences among Hawaiian genera and the similarity, for example, between Wilkesia (Bohm and Fong, 1990) and the mainland genera Calycadenia and Hemizonia (Bohm et aI., 1992;Proksch et aI., 1984;Tanowitz et aI., 1987). Flavonoid information would not support, at least at this time, a grouping of genera within Madiinae.…”

Section: Tribe Helenieaementioning

confidence: 98%

“…Nonpolar flavonoid aglycones of Argyroxiphium sandwicensis subsp. sandwicensis and both Wilkesia species have been identified (Bohm and Fong, 1990). Identified from the former were 5,4'-dihydroxy-7,8-dimethoxyflavone and 5,4'-dihydroxy-6,7,8-trimethoxyflavone, which represents a subset of the profile of Wilkesia.…”

Section: Argyroxiphium-wilkesia-dubautia (Madiinae)mentioning

confidence: 99%

“…One of them, W. hobdyi, is a threatened species. Both W. hobdYi, and the more common W. gymnoxiphium, have been examined for leaf surface flavonoids (Bohm and Fong, 1990), and shown to accumulate compounds with 6-and/or 8-oxygenation and moderate levels of 0-methylation. Occurrence of these compounds is summarized in Table 11-17.…”

Section: Chjo~mentioning

confidence: 99%

“…Flavonoids of both species were studied (Bohm and Fong, 1990) as part of our examination of the tarweeds (Madiinae). Eleven O-methylated flavonoids, two flavonols, nine flavones, were identified.…”

Section: Wilkesiamentioning

confidence: 99%

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Flavonoids of the Sunflower Family (Asteraceae)

Bohm

Stuessy

2001

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119

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This work is subject to copyright. All rights are reserved, whether the whole or part of the material is concerned, specifically those of translation, reprinting, re-use of illustrations, broadcasting, reproduction by photocopying machines or similar means, and storage in data banks. This book is dedicated to:Arthur Cronquist Outstanding plant systematist and major contributor to understanding taxonomic relationships within Asteraceae and Ralph E. Alston (1925Alston ( -1967) Visionary natural products chemist and geneticist who pioneered the use of chemical data in studies of plant systematics and evolution PrefaceCertainly many of the readers of this book will remember the early developments of chemosystematics in the late 1950s. We ourselves remember the excitement of these new data bearing on plant interrelationships. The hopes were high, the techniques were rapidly evolving, the quantities of data were large, and young workers were eagerly enthusiastic. Some even went so far as to predict that chemical data would soon replace morphological information as the basis for plant classification. These overly zealous predictions did not materialize, of course, as the history of plant systematics has amply shown during the past two centuries. If there is any distinct characteristic of systematics it is synthesis, as Lincoln Constance (1964) called it, the "unending synthesis." New tools generate new data and provide insights on additional dimensions of plant relationships. This will never change-we will continue to discover new tools and new data in the years ahead, and they will continue to be incorporated into the predictive general reference system of classification.The earlier efforts in chemosystematics focused on secondary plant products: alkaloids, betacyanins, carbohydrates, cyanogenic glycosides, glucosinolates, lipids, terpenoids, and especialiy flavonoids. The latter were particularly well suited for chemosystematic investigation for several reasons: ease of isolation and characterization, small amounts of plant material needed for analysis, stability of compounds especially through routine preparation of herbarium specimens, and low cost to obtain useful information. As a result of these considerable advantages, literally thousands of studies on use of flavonoids in plant systematics have been published. Although now with the present zest for macromolecular data from DNA restriction sites and sequences, there are fewer workers and laboratories dedicated to flavonoid chemosystematic studies; twenty years ago they were the new currency of exciting data in plant systematics.Because of many workers historically interested in the sunflower family, Asteraceae (or Compositae), in part due to its large size (approximately 23,000 species;Bremer, 1994), and because hundreds of flavonoid compounds were discovered in this family, many chemosystematic investigations have been completed on various taxa. Many studies came from the laboratories of R. A. Alston, B. L. Turner, and T. J. Mabry in the Department of Botany ...

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Section: Chjo~mentioning

confidence: 95%

Section: Tribe Helenieaementioning

confidence: 98%

Section: Argyroxiphium-wilkesia-dubautia (Madiinae)mentioning

confidence: 99%

Section: Chjo~mentioning

confidence: 99%

Section: Wilkesiamentioning

confidence: 99%

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