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Showing papers by "Tom J. Mabry published in 1976"


Journal ArticleDOI
TL;DR: Except for a few isolated 2 n populations which exhibited minor differences, a single chemical type was observed for all three ploidy levels in the North American L. tridentata suggesting an autoploid origin for the tetraploid and hexaploid races.

61 citations


Journal ArticleDOI
TL;DR: It is suggested that the betalain and anthocyanin families developed from a common ancestor at a time prior to the widespread occurrence of floral pigments in angiosperms.
Abstract: The structural types, biogenesis and distribution of betalains and anthocyanins in centrospermous families are reviewed. The implications of the pigment and DNA-RNA hybridization data, along with other evidence, are discussed with respect to the view that the evolutionary line of centrospermous families contains eleven basic or core families of which nine produce betalains and two, theCaryophyllaceae andMolluginaceae, produce anthocyanins; it is suggested that the betalain and anthocyanin families developed from a common ancestor at a time prior to the widespread occurrence of floral pigments in angiosperms.

38 citations


Journal ArticleDOI
TL;DR: Kaempferol and quercetin 3-O-glycosides were found in the closely related species, Parthenium hysterophorus, P. bipinnatifidum and P. glomeratum as mentioned in this paper.

31 citations


Journal ArticleDOI

29 citations







Journal ArticleDOI
TL;DR: Xanthium strumarium is a polymorphic taxon that produces at least eight major sesquiterpene lactones and has received various taxonomic treatments and shows chemical diversity that indicates genes derived from the indigenous "strumarium" complex.
Abstract: A B S T R A C T Effects of hybridization on sesquiterpene lactones in Xanthium strumarium were studied for clues to the relationship of Old and New World populations. In crosses between indigenous Asiatic plants in the "strumarium" morphological complex and various American complexes that produce xanthinin as a major sesquiterpene lactone, the F1 hybrids contained xanthinin and the related compounds, xanthanol, xanthatin, and xanthinosin. In other crosses with various American complexes that produce xanthumin, the stereoisomer of xanthinin, the F1 hybrids contained xanthinin and xanthumin as well as xarithinin-related compounds and their stereoisomers, xanthumanol, deacetoxylxanthumin, and tomentosin. The Asiatic plants of "strumarium" from Hong Kong involved in the crosses produce approximately equal percentages of xanthinin, xanthatin and xanthinosin, but those from India contain only xanthinosin. The putative introduction of the American morphological complex, "chinense," contains xanthumin as the major component but shows chemical diversity that indicates genes derived from the indigenous "strumarium" complex. SESQUITERPENE LACTONES, the bitter principles of many species in the Compositae, were studied in experimental hybrids of Xanthium strumarium L. (sensu lato) for clues to the relationship of Old and New World populations. Infraspecific variation of sesquiterpene lactones has been reported in Xanthium by Winters, Geissman, and Safir (1969), McMillan (1971, 1972, 1974a) and McMillan et al. (1975) and is a well established phenomenon in other species of Compositae (Mabry, 1970; Geissman and Lee, 1971). Xanthium strumarium is a polymorphic taxon that produces at least eight major sesquiterpene lactones and has received various taxonomic treatments (Millspaugh and Sherff, 1919; Wilder, 1923; Love and Dansereau, 1959). We apply

6 citations