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Showing papers by "Tom J. Mabry published in 1973"



Journal ArticleDOI
TL;DR: In some eases, well-defined chemical raccs have been shown to exist and it has been suggested that these be treated as intraspecific taxa as mentioned in this paper, since many natural products are known to be useful in defence against predators, as attractants for pollinators and in several other ways, much of the chemical diversity which is encountered arises from the selection of populations which show an ecological amplitude in a given habitat.
Abstract: Different populations of many, if not all, plant species show some chemical variation iii one or rnorc classes of constituent. In some eases, well-defined chemical raccs have been shown to exist and it has been suggested that these be treated as intraspecific taxa. It is suggested that since many of the natural products are known to be useful in defence against predators, as attractants for pollinators and in several other ways, much of the chemical diversity which is encountered arises from the selection of populations which show an ecological amplitude in a given habitat. Examples are given from lichens, ferns and angiosperms covering a range of diverse chemical compounds and different examples of geographical variation.

39 citations


Journal ArticleDOI
TL;DR: In this article, a GC-MS of perdeuteriomethylated aglycones, singly and in mixtures, yields information about both the aglycone types and their substitution patterns.

24 citations




Book ChapterDOI
01 Jan 1973
TL;DR: Some of the secondary chemical constituents appear to be relic compounds in that they are produced today in a wide variety of genetically related species by a genome which was present in the ancestral stock as discussed by the authors.
Abstract: As far as is known every plant species produces some unique secondary compounds, often in remarkably large quantities. Although some of these alkaloids, terpenes, phenolics, etc. regulate vital biochemical processes at the cellular level, others mediate the interaction of the plant with other organisms and with other elements of the ecosystem. Some of the secondary chemical constituents appear to be relic compounds in that they are produced today in a wide variety of genetically related species by a genome which was present in the ancestral stock; others may be present in only a very few populations which are restricted to a unique ecosystem and appear to be of more recent origin and thus represent one type of ecochemistry.

15 citations


Journal ArticleDOI
TL;DR: Ribosomal RNA homologies and the thermal stabilities of rRNA/DNA hybrids among ten species of the Centrospermae suggest that the betalain- producing families are phylogenetically closer to each other than to the anthocyanin-producing families which are examined.

10 citations



Journal ArticleDOI
TL;DR: All specimens from Chile were relatively uniform in their chemistry and morphology and correspond closely in these respects to plants from north of San Francisco.

3 citations