Spatial Distribution and Reproductive Behaviour of a Triploid Braken (Pteridium aquilinum) Clone in Britain

Sheffield, E.

doi:10.1006/anbo.1993.1103

Cited by 23 publications

(29 citation statements)

References 16 publications

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“…Comparisons of spore size (Table 3) establish for the first time that ssp. feei is diploid, the spore size having been validated as an indicator of ploidy level in ferns (Barrington, Paris & Ranker, 1986) and, especially, in Pteridium by Sheffield et al (1993).…”

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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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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“…As has been observed in the field, patches of P. aquilinum developed in the simulation through the two contrasting processes of agglomeration and spread (Oinonen, 1967;Sheffield et al, 1989Sheffield et al, , 1993Parks and Werth, 1993). Some patches resulted from two foci of growth merging to form an agglomeration that was larger and therefore more vigorous than a patch that could have been formed by either focus alone (Fig.…”

Section: Agglomeration and Spread Of Genetsmentioning

confidence: 58%

“…Field studies have also observed several more of the qualitative phenomena generated by this simulation. Patches of P. aquilinum may be found with compositions ranging from dominance by a single genet through mixtures of a few genets to mixtures of many genets (Oinonen, 1967;Sheffield et al, 1989;Sheffield et al, 1993). Populations consist of many genets, but only a minority are sampled more than once, and most samples may come from the very few most abundant genets (Parks and Werth, 1993).…”

Section: Synergy and Competitionmentioning

confidence: 99%

“…Moreover, studies of P. aquilinum have already made important contributions to our understanding of the genet structure of plant populations (Oinonen, 1967;Sheffield et at., 1989;Parks and Werth, 1993;Sheffield et at., 1993). Thus a simulation of local growth in P. aquilinum, labelling different initial cells as different genets, could be compared with published observations on the genet structure of field populations.…”

Section: Introductionmentioning

confidence: 99%

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Ecology and Evolutionary Biology of Clonal Plants

Stuefer¹,

Erschbamer²,

Huber³

et al. 2002

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“…If those spores are actually diploid, they are possibly form triploid and tetraploid sporophytes by gametophytic crossing with haplospores and gametophytic selfing, respectively, as stressed by the works on unreduced spore formation in ferns (Morzenti 1962(Morzenti , 1967Haufler et al 1985;Gastony 1986;Sheffield et al 1993). The tetraploid sporophytes may be partially fertile.…”

Section: Discussionmentioning

confidence: 99%

Two types of partial fertility in a diploid population of the fern Thelypteris decursive-pinnata (Thelypteridaceae)

Nakato¹,

Ootsuki

Murakami

et al. 2011

J Plant Res

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Two types of abnormal sporophytes were observed in a population of diploid Thelypteris decursive-pinnata. Most sporophytes in this population exhibited regular chromosome pairing, resulting in the formation of 30 bivalents in meiosis I; however, they produced abortive spores to various degrees. Some formed large globose spores at low frequencies, most likely to be unreduced diplospores. The other type of abnormal sporophyte underwent synaptic failure to form 60 univalents at meiosis I, but produced fertile spores, mostly large globose ones at low frequencies. The globose spores were considered unreduced diplospores because the gametophytes arising from them produced tetraploid sporophytes by gametophytic selfing. One tetraploid formed only univalents at meiosis I. Allozyme variation was not detected in this population, although neighboring ordinary diploid populations exhibited it to a certain degree. The sympatric occurrence and allozyme uniformity of the two groups suggest that both are offspring of a founder sporophyte, which may have possessed two types of mutated recessive genes responsible for the spore sterility and the synaptic failure in meiosis. Unreduced spores formed by these two types may play an important role in the polyploid speciation of this species.

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Spatial Distribution and Reproductive Behaviour of a Triploid Braken (Pteridium aquilinum) Clone in Britain

Cited by 23 publications

References 16 publications

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

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

Ecology and Evolutionary Biology of Clonal Plants

Two types of partial fertility in a diploid population of the fern Thelypteris decursive-pinnata (Thelypteridaceae)

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