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Gastony GJ. Gene silencing in a polyploid homosporous fern: paleopolyploidy revisited. Proc Natl Acad Sci U S A. 1991;88(5):1602-5doi: 10.1073/pnas.88.5.1602.
Gastony, G. J. (1991). Gene silencing in a polyploid homosporous fern: paleopolyploidy revisited. Proceedings of the National Academy of Sciences of the United States of America, 88(5), 1602-5. https://doi.org/10.1073/pnas.88.5.1602
Gastony, G J. "Gene silencing in a polyploid homosporous fern: paleopolyploidy revisited." Proceedings of the National Academy of Sciences of the United States of America vol. 88,5 (1991): 1602-5. doi: https://doi.org/10.1073/pnas.88.5.1602
Gastony GJ. Gene silencing in a polyploid homosporous fern: paleopolyploidy revisited. Proc Natl Acad Sci U S A. 1991 Mar 01;88(5):1602-5. doi: 10.1073/pnas.88.5.1602. PMID: 11607154; PMCID: PMC51072.
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Proc Natl Acad Sci U S A. 1991 Mar 01;88(5):1602-5. doi: 10.1073/pnas.88.5.1602.

Gene silencing in a polyploid homosporous fern: paleopolyploidy revisited.

Proceedings of the National Academy of Sciences of the United States of America

G J Gastony

Affiliations

  1. Department of Biology, Indiana University, Bloomington, IN 47405, USA.

PMID: 11607154 PMCID: PMC51072 DOI: 10.1073/pnas.88.5.1602

Abstract

Because of their high chromosome numbers, homosporous vascular plants were considered paleopolyploids until recent enzyme electrophoretic studies rejected this hypothesis by showing that they express only diploid numbers of isozymes. In polyploid sporophytes of the homosporous fern pelleae rufa, however, progressive diminution of phosphoglucoisomerase activities encoded by one ancestral genome culminates in tetraploid plants exhibiting a completely diploidized electrophoretic phenotype for this enzyme. The demonstration that such gene silencing can make a polyploid fern look isozymically like a diploid questions the validity of isozyme evidence for testing the paleopolyploid hypothesis and supports the proposed role of polyploidization followed by genetic diploidizaton in the evolutionary history of homosporous pteridohytes.

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