Genetic evidence for hybridization between the native Spartina maritima and the introduced Spartina alterniflora (Poaceae) in South-West France: Spartina × neyrautii re-examined

Baumel, Alex; Aïnouche, Malika L.; Misset, Marie-Thérèse; Gourret, J. P.; Bayer, Randall J.

doi:10.1007/s00606-002-0251-8

Cited by 78 publications

(64 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of the present study show that if multiple hybridization events occurred, they would have involved the same S. maritima genotype, identified here as the S. maritima 'genotype 1'. S. maritima and S. alterniflora have been involved in another hybridization event in Southern France (Foucaud, 1897), where the molecular characterization of the resulting sterile hybrid, S. Â neyrautii (Baumel et al, 2003), indicates that S. maritima was the paternal genome donor (as for S. Â townsendii and S. anglica, Ferris et al, 1997;Baumel et al, 2001). The genotype of S. maritima involved in the hybridization (in Spain) was 'genotype no.…”

Section: Discussionmentioning

confidence: 99%

Uniformity of the nuclear and chloroplast genomes of Spartina maritima (Poaceae), a salt-marsh species in decline along the Western European Coast

2004

View full text Add to dashboard Cite

Spartina maritima is a salt-marsh species from European and African Atlantic coasts. In the northern range of the species (including north-west France), a rapid decline of the populations has been observed during the 20th century. In this paper, the molecular diversity of 10 populations of S. maritima from France has been investigated using nuclear and chloroplast DNA markers: inter-simple sequence polymorphism (ISSR), randomly amplified polymorphic DNA (RAPD), inter-retrotransposon amplified polymorphism (IRAP), and PCR-RFLP of a 5 kb long portion of chloroplast DNA. The results reveal an extremely low level of genetic variation in this species: only one nuclear marker (out of 98) was polymorphic, with the presence of two genotypes randomly distributed among the populations. The lack of genetic diversity is interpreted in light of the almost exclusive vegetative propagation of the species in its northern range, the colonization history of the populations, and the origin of S. maritima (2n ¼ 60) in the hexaploid lineage of the genus and in the context of the management of S. maritima populations.

show abstract

Section: Discussionmentioning

confidence: 99%

Uniformity of the nuclear and chloroplast genomes of Spartina maritima (Poaceae), a salt-marsh species in decline along the Western European Coast

2004

View full text Add to dashboard Cite

show abstract

“…This may reflect alignment differences and/or the different phylogenetic analyses conducted (parsimony in the earlier studies and ML and Bayesian here). Our sampling includes S. ×townsendii, a sterile F1 hybrid of S. alterniflora (the female parent) and S. maritima (the male parent) and the precursor of the amphidiploid S. anglica (reviewed in Saarela, 2012); the parentage of S. ×townsendii was confirmed based on variation in plastid regions (trnT-trnL, rpl16) and molecular fingerprinting (Ferris & al., 1997;Baumel & al., 2002Baumel & al., , 2003. Curiously, neither S. ×townsendii nor S. anglica were sampled in the earlier phylogenetic studies (Baumel & al., 2002;Fortune & al., 2007Fortune & al., , 2008.…”

Section: Sporobolus Cryptandrus Cladementioning

confidence: 99%

A molecular phylogeny and new subgeneric classification of Sporobolus (Poaceae: Chloridoideae: Sporobolinae)

Peterson

Romaschenko

Arrieta³

et al. 2014

TAXON

114

View full text Add to dashboard Cite

The grass subtribe Sporobolinae contains six genera: Calamovilfa (5 spp. endemic to North America), Crypsis (10 spp. endemic to Asia and Africa), Psilolemma (1 sp. endemic to Africa), Spartina (17 spp. centered in North America), Sporobolus (186 spp. distributed worldwide), and Thellungia (1 sp. endemic to Australia). Most species in this subtribe have spikelets with a single floret, 1-veined (occasionally 3 or more) lemmas, a ciliate membrane or line of hairs for a ligule, and fruits with free pericarps (modified caryopses). Phylogenetic analyses were conducted on 177 species (281 samples), of which 145 species were in the Sporobolinae, using sequence data from four plastid regions (rpl32-trnL spacer, ndhA intron, rps16-trnK spacer, rps16 intron) and the nuclear ribosomal internal transcribed spacer regions (ITS) to infer evolutionary relationships and provide an evolutionary framework on which to revise the classification. The phylogenetic analysis provides weak to moderate support for a paraphyletic Sporobolus that includes Calamovilfa, Crypsis, Spartina, and Thellungia. In the combined plastid tree, Psilolemma jaegeri is sister to a trichotomy that includes an unsupported Urochondra-Zoysia clade (subtr. Zoysiinae), a strongly supported Sporobolus somalensis lineage, and a weakly supported Sporobolus s.l. lineage. In the ITS tree the Zoysiinae is sister to a highly supported Sporobolinae in which a Psilolemma jaegeri-Sporobolus somalensis clade is sister to the remaining species of Sporobolus s.l. Within Sporobolus s.l. the nuclear and plastid analyses identify the same 16 major clades of which 11 are strongly supported in the ITS tree and 12 are strongly supported in the combined plastid tree. The positions of three of these clades representing proposed sections Crypsis, Fimbriatae, and Triachyrum are discordant in the nuclear and plastid trees, indicating their origins may involve hybridization. Seven species fall outside the major clades in both trees, and the placement of ten species of Sporobolus are discordant in the nuclear and plastid trees. We propose incorporating Calamovilfa, Crypsis, Spartina, Thellungia, and Eragrostis megalosperma within Sporobolus, and make the requisite 35 new combinations or new names. The molecular results support the recognition of 11 sections and 11 subsections within Sporobolus s.l.; four sections are new:

show abstract

“…Spartina anglica is a natural, but very young allopolyploid that arose during the end of the 19th century in southern England, from a hybridization between the native S. maritima and the introduced S. alterniflora (Baumel et al, 2003). Spartina anglica is a vigorous allopolyploid, which has now invaded many salt marshes and estuaries in Western Europe and has been introduced on several continents since its formation.…”

Section: Rapid Versus Quiescent Genome Evolution In Newly-synthesizedmentioning

confidence: 99%

Genome evolution of allopolyploids: a process of cytological and genetic diploidization

Ma¹,

Gustafson

2005

Cytogenet Genome Res

176

125

View full text Add to dashboard Cite

Allopolyploidy is a prominent mode of speciation in higher plants. Due to the coexistence of closely related genomes, a successful allopolyploid must have the ability to invoke and maintain diploid-like behavior, both cytologically and genetically. Recent studies on natural and synthetic allopolyploids have raised many discrepancies. Most species have displayed non-Mendelian behavior in the allopolyploids, but others have not. Some species have demonstrated rapid genome changes following allopolyploid formation, while others have conserved progenitor genomes. Some have displayed directed, non-random genome changes, whereas others have shown random changes. Some of the genomic changes have appeared in the F₁ hybrids, which have been attributed to the union of gametes from different progenitors, while other changes have occurred during or after genome doubling. Although these observations provide significant novel insights into the evolution of allopolyploids, the overall mechanisms of the event are still elusive. It appears that both genetic and epigenetic operations are involved in the diploidization process of allopolyploids. Overall, genetic and epigenetic variations are often associated with the activities of repetitive sequences and transposon elements. Specifically, genomic sequence elimination and chromosome rearrangement are probably the major forces guiding cytological diploidization. Gene non-functionalization, sub-functionalization, neo-functionalization, as well as other kinds of epigenetic modifications, are likely the leading factors promoting genetic diploidization.

show abstract

Genetic evidence for hybridization between the native Spartina maritima and the introduced Spartina alterniflora (Poaceae) in South-West France: Spartina × neyrautii re-examined

Cited by 78 publications

References 14 publications

Uniformity of the nuclear and chloroplast genomes of Spartina maritima (Poaceae), a salt-marsh species in decline along the Western European Coast

Uniformity of the nuclear and chloroplast genomes of Spartina maritima (Poaceae), a salt-marsh species in decline along the Western European Coast

A molecular phylogeny and new subgeneric classification of Sporobolus (Poaceae: Chloridoideae: Sporobolinae)

Genome evolution of allopolyploids: a process of cytological and genetic diploidization

Contact Info

Product

Resources

About