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Taxonomic significance of floral pigments in linum (Linageae)

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Abstract

Floral pigments of 30 taxa, representing five informally ranked subgeneric complexes(Linum schiedeanum, L. virginianum,L. neomexicanum, L. sulcatum, andL. rigidum) of yellow-flowered North American flaxes, were examined by paper chromatography. Earlier studies, based on comparative gross morphology, chromosomal complements, and pollen structure, led to the conclusion that members of theL. schiedeanum complex may be the most primitive and that theL. virginianum, L. neomexicanum, andL. rigidum complexes may have been derived independently, the latter via a taxon similar toL. sulcatum. Data from both carotenoids and flavonoids support this scheme. Spectral analysis reveals the exclusive presence of the Β-carotenoid, violaxanthin, in the X.schiedeanum, L. virginianum, L. neomexicanum, andL. sulcatum com-Taxa of theL. rigidum complex, with the exception ofL. subteres, possesplexes. exclusively the α-carotenoids, lutein and its 5, 6-monoepoxide.L. subteres, in its production of violaxanthin, provides a chemical link to the other complexes, though possession of several species-specific flavonoids suggests an early divergence from other members of theL. rigidum complex. Distinctions in the Chromatographic patterns of quercetin, luteolin, and other flavonoid compounds were found among the five groups. In general the loss of flavonoid pigments may be correlated with increased morphological specialization. Identical patterns in certain species of theL. schiedeanum andL. virginianum complexes support the presumed relationship between these two groups.

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Authors and Affiliations

  1. Wayne State University, Detroit, Michigan

    David E. Giannasi & C. Marvin Rogers

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  1. David E. Giannasi
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  2. C. Marvin Rogers
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Giannasi, D.E., Rogers, C.M. Taxonomic significance of floral pigments in linum (Linageae). Brittonia 22, 163–174 (1970). https://doi.org/10.2307/2805810

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