Showing papers by "Tom J. Mabry published in 1979"
TL;DR: Two new and eleven known 6-methoxyflavonoids were identified in leaf tissue of Brickellia californica as mentioned in this paper, including eupatin 3-SO3 Ca1/2 and patuletin 3 -SO3K.
58 citations
TL;DR: In this article, Kaur-16-en-19-oic acid and tetrachyrin, a rearranged kaurenoid lactone, were isolated from Tetrachyron orizabaensis var. websteri and Helianthus debilis ssp.debilis.
50 citations
TL;DR: One new and fourteen known flavonoids, including thirteen containing 6-methoxy groups, were isolated from Brickellia laciniata as mentioned in this paper, and the new flavonol is quercetagetin 6,4-dimethyl ether.
40 citations
TL;DR: In this paper, four new germacranolides were isolated from H. mollis using 1 H NMR and 13 C NMR data and chemical interconversions were described.
35 citations
TL;DR: Sesquiterpene lactone glaucolide-A from Vernonia, incorporated in the rearing diets of five species of Lepidoptera, significantly reduced the rate of growth of larvae of the southern armyworm, Spodoptera eridania; fall armyworm; and yellowstriped armyworms, S. ornithogalli.
Abstract: Sesquiterpene lactone glaucolide-A from Vernonia, incorporated in the rearing diets of five species of Lepidoptera, significantly reduced the rate of growth of larvae of the southern armyworm, Spodoptera eridania; fall armyworm, S. frugiperda; and yellowstriped armyworm, S. ornithogalli. Quantitative feeding tests demonstrated that decreased feeding levels and reduced growth resulted from ingestion of a sesquiterpene lactone. Ingestion of glaucolide-A increased the number of days to pupation in four of the species. In the southern armyworm, it significantly reduced pupal weight. Glaucolide-A decidedly reduced percentage of survival of southern and fall armyworms. Yellow woollybear, Diacrisia virginica, and cabbage looper, Trichoplusia ni, larvae were essentially uneffected by the ingestion of the sesquiterpene lactone. Sesquiterpene lactones adversely affect growth rate and survival of certain insects that feed upon plants containing them. They apparently function as defensive products, screening out a portion of the potential herbivores.
29 citations
21 citations
19 citations
TL;DR: In this paper, five new 8-hydroxyflavonoids have been identified from leaves of Solanum section Androceras: 8-methoxymyricetin 3,7,4′-trimethyl ether; 8-hoyl-methyltin 8-O-glucosylxyloside 3, 7,4,5,6,7-methyl ether.
17 citations
TL;DR: The sesquiterpene lactone distribution correlates with morphologically defined species groups and is consistent with those of selected Sonoran Desert Ambrosia taxa.
15 citations
TL;DR: Dploid, tetraploid and hexaploid populations of Ambrosia dumosa yielded several different sesquiterpene lactone patterns, useful in relating the different levels of this polyploid series.
11 citations
TL;DR: Diploid and tetraploid specimens of Ambrosia camphorata have distinct sesquiterpene lactone patterns; however, no direct correlation between chemistry and morphological patterns is detectable.