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Showing papers by "Tom J. Mabry published in 1977"


Journal ArticleDOI
TL;DR: In this article, the leaves of Polygonatum multiflorum (L.) All were isolated from the leaves and the structures of 6.8-C-Galactosylapigenin and 6.

25 citations


Journal ArticleDOI
01 May 1977-Taxon
TL;DR: Eastern cottontail rabbits, Sylvilagus floridanus (Allen), were demonstrated to prefer feeding upon Vernonia flaccidifolia Small which lacks sesquiterpene lactones rather than V. gigantea (Walt.) Trel.
Abstract: Summary Eastern cottontail rabbits, Sylvilagus floridanus (Allen), were demonstrated to prefer feeding upon Vernonia flaccidifolia Small which lacks sesquiterpene lactones rather than V. gigantea (Walt.) Trel. ssp. gigantea which contains the bitter sesquiterpene lactone glaucolide-A. The rabbits also essentially avoided V. flaccidifolia coated with a thin layer of glaucolide-A. Whitetail deer, Odocoileus virginianus (Zimmermann), were shown to prefer V. flaccidifolia over V. gigantea as well as V. flaccidifolia coated with glaucolide-A. These experimentally determined feeding preferences supported field observations. Sesquiterpene lactones, in addition to functioning as insect feeding deterrents, also appear to defend Vernonia against browsing mammals. The wide distribution of sesquiterpene lactones in Compositae may be related to coevolution not only with insects but also with mammalian herbivores.

22 citations



Journal ArticleDOI
TL;DR: The presence of S-type sieve-element plastids and anthocyanins in the Vivianiaceae indicates that it is not a member ofCentrospermae (Caryophyllales).
Abstract: The presence of S-type sieve-element plastids and anthocyanins in theVivianiaceae indicates that it is not a member ofCentrospermae (Caryophyllales).

15 citations


Journal ArticleDOI
TL;DR: Leaf extracts of 43 plants representing all 10 species of the genus Sarracenia were analyzed by 2D-PC, high voltage electrophoresis and G. C. C., for their amino acids and flavonoids to determine their taxonomic and ecological significance.

13 citations



Journal ArticleDOI
TL;DR: Contrary to the pattern observed in laboratory feeding preference tests, Vernononia flaccidifolia, the species lacking sesquiterpene lactones, was consistently fed upon less by insects than wereV.
Abstract: A field insect feeding experiment was conducted with two species ofVernonia which produce the sesquiterpene lactone glaucolide-A, one species which does not contain this bitter compound, and two F1 hybrid combinations. Also, naturalVernonia populations were observed over a two year period for their degree of herbivory. Contrary to the pattern observed in laboratory feeding preference tests,Vernonia flaccidifolia, the species lacking sesquiterpene lactones, was consistently fed upon less by insects than wereV. gigantea andV. glauca. Even though glaucolide-A appears to adequately protect some Vernonias against herbivores, especially mammals,Vernonia flaccidifolia has lost this compound. ApparentlyV. flaccidifolia has evolved an alternative defensive mechanism which is more effective against insects but less effective against mammalian herbivores.

8 citations