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Chromosome Behavior in Hybrid Ferns: A Reinterpretation of Appalachian Dryopteris

Leslie G. Hickok and Edward J. Klekowski, Jr.
American Journal of Botany
Vol. 62, No. 6 (Jul., 1975), pp. 560-569
Stable URL: http://www.jstor.org/stable/2441933
Page Count: 10
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Chromosome Behavior in Hybrid Ferns: A Reinterpretation of Appalachian Dryopteris
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Abstract

Analyses of chromosome pairing behavior in fern hybrids, as evidenced by the degree of bivalent and/or univalent formation at meiotic prophase, have frequently been employed in studies of evolutionary relationships within polyploid fern complexes. Pairing is often seen to involve genomic numbers of chromosomes. Many examples exist, however, that indicate pairing on subgenomic levels. If this type of behavior is not recognized in analyses of F1 hybrids and their polyploid derivatives, interpretations of evolutionary relationships based upon pairing behavior may be misleading. Contrary to some views, sterile triploid hybrids possessing less than three distinct genomes may play a significant role in the formation of reticulate polyploid complexes. This possibility must be considered in interpretations of these complexes. With these factors in mind, the Appalachian Dryopteris complex has been reinterpreted. The reinterpretation provides explanations for several unexplained inconsistencies in previous interpretations.

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