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Chemo-Demes of Diploid and Tetraploid Thelesperma Simplicifolium (Heliantheae, Coreopsidineae)

Thomas E. Melchert
American Journal of Botany
Vol. 53, No. 10 (Nov. - Dec., 1966), pp. 1015-1020
Stable URL: http://www.jstor.org/stable/2440681
Page Count: 6
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Chemo-Demes of Diploid and Tetraploid Thelesperma Simplicifolium (Heliantheae, Coreopsidineae)
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Abstract

Selected secondary biochemical constituents (mainly flavanoids) contained in methanol leaf extracts of 11 taxa in the genus Thelesperma were analyzed via two-dimensional paper chromatography. With but one exception all produce an essentially identical array of these compounds. Since this common or "generic" biochemical profile is present regardless of the morphological, ecological, and cytological differences among and within the various species, it is impossible to make accurate specific identifications on the basis of chromatographic data alone. Recently, however, morphologically identical, but allopatric, diploid and tetraploid races of T. simplicifolium were discovered which differ radically in respect to these secondary biochemical components. Their infraspecific biochemical differences are so absolute that it is possible to predict accurately the ploidy level and geographic source of any given individual from its chromatographic profile. The evolutionary implications of these biochemical differences are also discussed briefly.

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