Cytological and Taxonomic Notes on a Small Collection of Living Ferns from Galapagos

Jarrett, F. M.; Manton, I.; Roy, S. K.

doi:10.2307/4108355

Cited by 23 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, the majority of Pteridium populations appeared to be diploid as suggested by chromosome counts and other evidence (e.g., Takahashi, 1961;Jarrett & al., 1968;Mitui, 1976;Walker, 1985;Manton & al., 1986;Wolf & al., 1987Wolf & al., , 1988Tan & Thomson, 1990;Tindale & Roy, 2002;Der & al., 2009). Thus, the taxonomic difficulties experienced in the studies of Pteridium were not the result of infrequent polyploidization but more likely of frequent hybridization between subspecies of P. aquilinum and the lack of stable diagnostic features allowing the recognition of the diploid taxa.…”

Section: Discussionmentioning

confidence: 77%

“…We took three steps to define species in Pteridium: (1) identification of diploid and polyploid taxa; (2) determining the number of diploid taxa by applying a diploid first approach (Brown & al., 2002, Thomson & al., 2005, Beck & al., 2010; and (3) defining the minimum number of polyploid taxa (speciation via polyploidy) which originated either via autopolyploidy or allopolyploidy. Some evidence for spontaneous formation of autopolyploids has been reported for Pteridium (Sheffield & al., 1993) but most of polyploid Pteridium appeared to be hybrids between species (e.g., Jarrett & al., 1968;Thomson & Alonso-Amelot, 2002;Der & al., 2009). In turn, the establishment of allopolyploids from hybridization events suggested the existence of at least two diploid species that repeatedly formed polyploid offspring in their contact zones (Thomson & Alonso-Amelot, 2002).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

How many species of bracken (Pteridium) are there? Assessing the Chinese brackens using molecular evidence

Zhou

Dong

Chen

et al. 2014

TAXON

View full text Add to dashboard Cite

Pteridium (the bracken) is a genus of common and widely distributed ferns throughout the world. The variation patterns of morphology in the genus are highly complex and no consensus has been reached among taxonomists regarding the number of species as well as subdivision of the variable species. To address the question of how many species and subspecies of Pteridium occur in Asia, 75 populations were sampled in Bolivia, China, Japan, Malaysia, Mexico and Peru. Sequence data of three chloroplast DNA regions, rps4‐trnSGGA, rpl16 and trnSGCU‐trnGUCC and the genotype data of three microsatellite loci were collected. The newly generated sequence data combined with the sequences already available from GenBank for samples from all over the world were subjected to several phylogenetic analyses and species delimitation tests. The results support recognition of two diploid species, P. aquilinum in the Northern Hemisphere and Africa and P. esculentum in South America and Australia. Evidence was found to recognize one Asian tetraploid species, P. semihastatum. The Eurasian occurrences of P. aquilinum can be further subdivided into subsp. aquilinum occurring in Africa, Europe and Asia Minor; subsp. japonicum occurring from East Asia to eastern Europe; subsp. wightianum occurring from central China to Malesia (Malay Peninsula, New Caledonia, New Zealand) and northern Australia. The North American subsp. latiusculum was also found in India. Some local “species” recorded in Flora of China likely represent hybrids between subsp. japonicum and subsp. wightianum.

show abstract

Section: Discussionmentioning

confidence: 77%

Section: Discussionmentioning

confidence: 99%

How many species of bracken (Pteridium) are there? Assessing the Chinese brackens using molecular evidence

Zhou

Dong

Chen

et al. 2014

TAXON

View full text Add to dashboard Cite

show abstract

“…1968; Sheffield et al . 1993) but sporophytic counts of 2n = 52 for Spanish and 2n = 208 for Galapagos specimens have been reported (Jarrett et al . 1968; Löve & Kjellqvist 1972).…”

Section: Structure and Physiologymentioning

confidence: 96%

“…Chromosome counts of n = 52 (gametophytic), 2n = 104 (sporophytic) characterize most plants (Jarrett et al . 1968; Sheffield et al .…”

Section: Structure and Physiologymentioning

confidence: 99%

“…( )  Chromosome counts of n = 52 (gametophytic), 2n = 104 (sporophytic) characterize most plants (Jarrett et al 1968;Sheffield et al 1993) but sporophytic counts of 2n = 52 for Spanish and 2n = 208 for Galapagos specimens have been reported (Jarrett et al 1968;Löve & Kjellqvist 1972). The Spanish material led to suggestions that the basic chromosome number for Pteridium was x = 26 and the most common specimens (2n = 104) are tetraploid.…”

Section: Rate Of Spreadmentioning

confidence: 99%

See 1 more Smart Citation

Biological Flora of the British Isles: Pteridium aquilinum (L.) Kuhn

2006

View full text Add to dashboard Cite

Summary1 This account reviews information on all aspects of the biology of bracken Pteridium (mainly aquilinum ssp. aquilinum) that are relevant to understanding its ecological characteristics and behaviour. The main topics are presented within the standard framework of the Biological Flora of the British Isles: distribution, habitat, communities, responses to biotic factors, responses to environment, structure and physiology, phenology, reproductive characters, herbivores and disease, history, and conservation. 2 Pteridium is a complex genus comprising a number of species, subspecies and varieties. The treatment here is based on a recent revision that incorporates both morphological and molecular data, and is related to its geographical distribution. 3 Pteridium is thought to be a woodland genus, but it can grow in the open. It is cosmopolitan and occurs on all continents except Antarctica. It responds to human disturbance and is often found in open spaces after forest clearance and cultivation. In some situations it can be a troublesome weed, causing problems for land managers. Moreover, its abundance and distribution in Britain are predicted to increase as a result of global climate change. 4 Pteridium aquilinum ssp. aquilinum, the most common taxon in the British Isles, occurs in many plant communities, and it is apparently limited by frost and waterlogging. Its abundance has probably increased in the relatively recent past as a result of changing land management, and this increase impinges on plant communities with a high conservation interest. The changed land management reflects changing use of agricultural land and also a reduction in the use of Pteridium as a resource. Accordingly, in many places Pteridium is viewed as a weed and management is needed to control it and restore more desirable vegetation. These management techniques are summarized.

show abstract

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

Sheffield

1993

Annals of Botany

View full text Add to dashboard Cite

Cytological and Taxonomic Notes on a Small Collection of Living Ferns from Galapagos

Cited by 23 publications

References 13 publications

How many species of bracken (Pteridium) are there? Assessing the Chinese brackens using molecular evidence

How many species of bracken (Pteridium) are there? Assessing the Chinese brackens using molecular evidence

Biological Flora of the British Isles: Pteridium aquilinum (L.) Kuhn

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

Contact Info

Product

Resources

About