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Article: Evolutionary Genomic Analyses of Ferns Reveal that High Chromosome Numbers are a Product of High Retention and Fewer Rounds of Polyploidy Relative to Angiosperms.(2008 AFS SYMPOSIUM SUMMARY)(Report)
- Article from:
- American Fern Journal
- Article date:
- April 1, 2009
- Author:
CopyrightCOPYRIGHT 2009 American Fern Society, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Evolutionary Genomic Analyses of Ferns Reveal that High Chromosome Numbers are a Product of High Retention and Fewer Rounds of Polyploidy Relative to Angiosperms.--Ever since the first chromosome counts of homosporous pteridophytes revealed that they possess astonishingly high numbers of chromosomes, botanists have recognized the unique genomic composition of these plants. Basal chromosome counts for fern genera are significantly higher than similar values from angiosperms (homosporous ferns n = 57.05, angiosperms n = 16; Klekowski and Baker, 1966), a result that led early workers to assume that as many as 95% of ferns are polyploids. Numerous hypotheses have been proposed ...