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Homoeologous Chromosome Pairing and Restricted Segregation in the Fern Ceratopteris
Leslie G. Hickok
American Journal of Botany
Vol. 65, No. 5 (May - Jun., 1978), pp. 516-521
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2442584
Page Count: 6
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The segregation of a marker characterized by pale green gametophytes was monitored within an inbreeding study of the polyploid fern Ceratopteris. Although all of the sporophytes showing segregation were derived from the self-fertilization of haploid gametophytes, a low overall frequency of 2.5% pale gametophytes was observed in the F3-F5 generations. A model based upon a duplicated locus and homoeologous chromosome pairing can explain the segregational behavior within the study The overall level of homoeologous pairing was determined to be 10%. Occasionally, green gametophytes that were presumably heterozygous for the marker contained pale sectors. This behavior may involve mitotic crossing-over between homoeologous chromosomes.
American Journal of Botany © 1978 Botanical Society of America, Inc.