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Proposed Origin of Tetraploid Species of Crested Wheatgrass Based on Chromatographic and Karyotypic Analyses

Ronald J. Taylor and Gene A. McCoy
American Journal of Botany
Vol. 60, No. 6 (Jul., 1973), pp. 576-583
Stable URL: http://www.jstor.org/stable/2441382
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Proposed Origin of Tetraploid Species of Crested Wheatgrass Based on Chromatographic and Karyotypic Analyses
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Abstract

Chromatographic techniques were used and the results were correlated with karyotypic studies in an attempt to determine the origin of five tetraploid "species" of crested wheatgrass, Agropyron desertorum, A. fragile, A. imbricatum, A. sibiricum, and A. pectiniforme. Chromatograms of phenolic extracts of all tetraploid taxa and two diploids, A. imbricatum and A. pectiniforme-Fairway type, were developed using two-dimensional paper chromatography, and comparative analyses were made. The analyses were of three types: one in which the pigments were quantified and assigned weighted values; the second a qualitative analysis in which only the presence or absence of the pigments was considered; the third, a similar qualitative analysis of hydrolysates. Similarity indices were computed for all combinations of taxa in each of the comparative chromatographic analyses, and phenograms were prepared. The two diploid taxa were chromatographically distinct, and all tetraploid forms were intermediate with the exception of A. pectiniforme, which exhibited the same phenolic profile as the diploid A. pectiniforme-Fairway type, and two of its colchicine-induced tetraploids. From these data it is postulated that A. pectiniforme is a natural autopolyploid, and the other tetraploids included herein were derived through hybridization of A. imbricatum and A. pectiniforme-Fairway type, with subsequent allopolyploidy. This is in accord with karyotypic studies of McCoy and Law (unpublished).

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