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• W2330663742 abstract "Seed glucosinolate profiles (kinds and proportions of constituents) were analyzed by paper- and gas-chromatography for 89 collections of 40 species of Caulanthus and Streptanthus. Twenty-six compounds were identified; these are pre- sumed to be biosynthesized from five different protein amino acids. Considerable interspecific variability was uncovered, with differences involving both the number of glucosinolates constituting a profile (diversity) and the nature of biosynthetic modifications affecting their production (complexity). Serpentine-adapted taxa ap- pear to be as chemically diverse and complex as non-serpentine taxa. In general, a species possesses a characteristic chemical profile distinguishable from that of mor- phologically similar taxa. In six species significant intraspecific variability was de- tected; in S. cordatus this variability correlates with morphologically recognized infra- specific taxa. Suspected parallelism and convergence, however, reduce the taxonomic utility of glucosinolates as characters at subgeneric and generic levels in this group of Cruciferae. Caulanthus S. Wats. and Streptanthus Nutt. are two morphologically similar and presumably phylogenetically related genera of North Amer- ican Cruciferae. Together they comprise about 45 species of annual to perennial herbs that usually occupy dry, open habitats from sea-level to montane elevations. Species delimitation within each of the two and their separate generic status have been matters of long-standing controversy (cf. Payson 1923; Jepson 1925; Kruckeberg 1958; Munz 1959; Rollins 1971; Al-Shehbaz 1973; Rollins and Holmgren 1980)-an issue of some political as well as biological consequence because rare and endangered populations of these plants may be entitled to legal protection only if they constitute named taxa. As members of the putatively primitive tribe Thelypodieae, the two genera figure prominently in recent discussions on the phylogeny of Cruciferae, including place of origin and early di- versification (Al-Shehbaz 1973; Raven 1975; Hedge 1976). With the goals of testing current classifications of these genera and of describing new characters for anticipated revision and phylogenetic analysis, we initiated a paper- and gas-chromatographic survey of the glucosinolates (mustard oil glucosides) in seeds of these plants." @default.
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• W2330663742 date "1981-07-01" @default.
• W2330663742 modified "2023-09-26" @default.
• W2330663742 title "Chemotaxonomic Diversity and Complexity in Seed Glucosinolates of Caulanthus and Streptanthus (Cruciferae)" @default.
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• W2330663742 doi "https://doi.org/10.2307/2418282" @default.
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