Chromosome Studies on Ferns

Britton, Donald M.

doi:10.2307/2438442

Cited by 31 publications

(39 citation statements)

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“…However, the triploid variety can be distinguished morphologically and most importantly by a high number of inviable or aborted spores. Our specimen had healthy, viable spores, and additionally the chromosome counts for specimens from the same geographic area have always been tetraploids (Britton 1953;Britton 1964). Further chromosome counts and genome size analysis of several populations across the geographic range will be necessary to elucidate the cytotype distribution and genome size of P. virginianum.…”

Section: Resultsmentioning

confidence: 97%

“…quadrivalens is assumed to be a tetraploid based on the geographic range of this cytotype as shown in Britton 1964 e Literature is somewhat confusing on the ploidy of B. virginianum, but Britton (1953) and Wagner (1955) both list 2n=92 chromosomes; the base for the genus Botrychium is x=45 f P. virginianum is assumed to be a tetraploid based on the recorded range for this cytotype as well as morphological observations nuclei found in each respective ploidy level was determined using the fluorescence (log) at 590/50 nm flow cytometry histogram (Fig. 1b).…”

Section: Flow Cytometric Analysesmentioning

confidence: 99%

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DNA content variation in monilophytes and lycophytes: large genomes that are not endopolyploid

et al. 2011

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Less than 1% of known monilophytes and lycophytes have a genome size estimate, and substantially less is known about the presence and prevalence of endopolyploid nuclei in these groups. Thirty-one monilophyte species (including three horsetails) and six lycophyte species were collected in Ontario, Canada. Using flow cytometry, genome size and degree of endopolyploidy were estimated for 37 species. Across the five orders covered, 1Cx-values averaged 4.2 pg in the Lycopodiales, 18.1 pg for the Equisetales, 5.06 pg for a single representative of the Ophioglossales, 14.3 pg for the Osmundales, and 7.06 pg for the Polypodiales. There was no indication of endoreduplication in any of the leaf, stem, or root tissue analyzed. This information is essential to our understanding of DNA content evolution in land plants.

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Section: Resultsmentioning

confidence: 97%

Section: Flow Cytometric Analysesmentioning

confidence: 99%

DNA content variation in monilophytes and lycophytes: large genomes that are not endopolyploid

et al. 2011

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“…The chromosome number n = 40 was found in meiotic cells by SoRSA (1961), FABBRI (1963 and BRITTON (1953), whilst the somatic number 2n = 80 was observed by LovE & LovE (1961) and RoY & SAKYA (1963in FABBRI, 1963. A chromosome complement 2n = 82 was observed by RoY & PANDEY ( , in FABBRI 1963 in var.…”

Section: Asplenium Onopteris Lmentioning

confidence: 94%

Chromosome numbers of some Sicilian ferns. 1

Brullo

Leonardis

Pavone

1982

Webbia

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“…Chromosome counts showing a haploid karyotype of n = 52 have been published for sspp. latiusculum (Britton, 1953;Cody & Mulligan, 1982), pseudocaudatum (Wagner, 1955), and pubescens (as ssp. lanuginosum; Löve, Löve & Kapoor, 1971).…”

Section: Nuclear and Chloroplast Genomesmentioning

confidence: 99%

Taxonomic status and relationships of bracken ferns (Pteridium: Dennstaedtiaceae) of Laurasian affinity in Central and North America

2008

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Detailed quantitative comparisons confirm and extend the discrimination of four major morphotypes amongst brackens of Laurasian affinity in Central and North America. These are recognized here at subspecies level as: Pteridium aquilinum sspp. feei, pubescens, latiusculum, and pseudocaudatum. Measurements of spore size indicate that sporophytes of P. aquilinum ssp. feei are diploid (2n = 104), as are sspp. pubescens, latiusculum, and pseudocaudatum. Phenetic cluster analysis based on DNA fingerprinting by arbitrarily primed polymerase chain reaction groups these four subspecies as genomically more similar to each other than to any taxa from other geographical regions. The chloroplast haplotype of ssp. feei is the same as that of sspp. latiusculum, pseudocaudatum, and pubescens with respect to the absence of both of the short direct repeats in the rps4-trnS region (haplotype A), whereas the European ssp. aquilinum (haplotype B) has one of these repeats, and the Southern Hemisphere brackens P. arachnoideum and P. esculentum (haplotype C) have the other.

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Chromosome Studies on Ferns

Cited by 31 publications

References 0 publications

DNA content variation in monilophytes and lycophytes: large genomes that are not endopolyploid

DNA content variation in monilophytes and lycophytes: large genomes that are not endopolyploid

Chromosome numbers of some Sicilian ferns. 1

Taxonomic status and relationships of bracken ferns (Pteridium: Dennstaedtiaceae) of Laurasian affinity in Central and North America

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