Molecular systematics of the genus Senecio L. I: Hybridization in a British polyploid complex

Harris, Stephen; Ingram, Richard

doi:10.1038/hdy.1992.88

Cited by 48 publications

(44 citation statements)

References 36 publications

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“…The absence of some parental markers from S. cambrensis might be caused by certain markers not being entirely diagnostic of a parent species, and because the species has originated on at least two separate occasions. Welsh and Edinburgh material of S. cambrensis are known to have originated independently of each other Harris & Ingram 1992). Consequently, the presence of the C5-500 band in Welsh, but not Edinburgh, material of S. cambrensis might be due to different S. vulgaris parent genotypes being involved in the separate origins of the species at the two locations.…”

Section: Genomic Composition Of Hybrid Derivatives Of Senecio Squalidmentioning

confidence: 99%

Plant introductions, hybridization and gene flow

Abbott

James

Milne

et al. 2003

Phil. Trans. R. Soc. Lond. B

140

121

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Many regional floras contain a high proportion of recently introduced plant species. Occasionally, hybridization between an introduced species and another species (introduced or native) can result in interspecific gene flow. This may occur even in instances where the F 1 hybrid shows very high sterility, but occasionally produces a few viable gametes. We provide examples of gene flow occurring between some rhododendrons recently introduced to the British flora, and between an introduced and native Senecio species. Neutral molecular markers have normally been employed to obtain evidence of interspecific gene flow, but the challenge now is to isolate and characterize functional introgressed genes and to determine how they affect the fitness of introgressants and whether they improve adaptation to novel habitats allowing introgressants to expand the range of a species. We outline a candidate gene approach for isolating and characterizing an allele of the RAY gene in Senecio vulgaris, which is believed to have introgressed from S. squalidus, and which causes the production of ray florets in flower heads. We discuss the effects of this introgressed allele on individual fitness, including those that originate directly from the production of ray florets plus those that may arise from pleiotropy and/or linkage.

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Section: Genomic Composition Of Hybrid Derivatives Of Senecio Squalidmentioning

confidence: 99%

Plant introductions, hybridization and gene flow

Abbott

James

Milne

et al. 2003

Phil. Trans. R. Soc. Lond. B

140

121

View full text Add to dashboard Cite

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“…vulgatis). Evidence against the York radiate groundsel being a direct descendent of a tetraploid F1 hybrid comes from the finding that it does not exhibit the expected additive rDNA phenotype of the two parents when its DNA is treated with the restriction enzymes EcoP.J, EcoRV and BamHl (Harris & Ingram, 1992).…”

Section: 35mentioning

confidence: 99%

Morphometric and isozyme evidence for the hybrid origin of a new tetraploid radiate groundsel in York, England

Irwin

Abbott

1992

Heredity

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A morphometric and isozyme analysis of a fertile tetraploid radiate groundsel discovered in York, England, in 1979, showed it to differ markedly from typical inland radiate groundsel, Senecio vulgaris var. hibernicus. Morphologically, York radiate groundsel was intermediate between S. vulgaris and S. squalidus plants derived from York and Edinburgh populations. In addition, it exhibited an additive esterase phenotype which combined the aEst-1 and flEst-1 phenotypes expressed by S. vulgaris and S. squalidus, respectively. In contrast, S. vulgaris var. hibernicus does not express a j3Est-1 allozyme. It is concluded that York radiate groundsel is a product of hybridization between S. vulgaris and S. squalidus quite different from that of S. vulgaris var. hibernicus. This new variant appears to be of very recent origin, it exhibits a high level of self seed set, and is currently relatively well established in the city of York. Despite its ability to intercross with typical S. vulgaris, it appears to have maintained its distinctive morphological and isozyme phenotype in the wild.

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“…vulgaris s. 1. and S. cambrensis. The only length mutation was encountered in a Welsh population of S. cambrensis (Harris & Ingram, 1991a). Thirty-four of the 62 restriction sites used in the phylogenetic analysis were autapomorphic and 28 were synapomorphic, with respect to the S. paludosus outgroup.…”

Section: Resultsmentioning

confidence: 96%

“…The rDNA variation encountered within Senecio vulgaris ssp. vulgaris s. L, S. squalidus and S. cambrensis has been described in Harris & Ingram (1991a). Analysis of the patterns on the basis of shared fragments, followed by clustering using UPGMA ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…As a control S. cambrensis (2n = 6x = 60), the allohexaploid hybrid of S. vulgaris and S. squalidus, has been included and the genomes of S. jacobaea and S. paludosus have been used as outgroups. Harris & Ingram (1991a). All of the taxa, except S. paludosus (Section Doria) have been variously placed in either Section Jacobaea or Section Senecio (Chater & Walters, 1976;Alexander, 1979).…”

Section: Introductionmentioning

confidence: 99%

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Molecular systematics of the genus Senecio L. II: The origin of S. vulgaris L.

Ingram

1992

Heredity

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The origin of Senecio vulgaris L. and the relationship of its two subspecies, ssp. vulgaris and ssp. denticulatus (0. F. Muell.) P. D. Sell, are examined using nuclear ribosomal and chioroplast DNA analyses. No evidence was found to support either an allopolyploid or an autopolyploid origin of S. vulgaris, although it would appear that S. vernalis Waldst. & Kit, is not one of the progenitor taxa. Two results of particular interest were found: (i) the apparent identity of the chioroplast genomes of S. vulgaris ssp. vulgaris and S. squalidus L. and (ii) the divergence of the chloroplast genomes of ssp. vulgaris and Ainsdale ssp. denticulatus by at least eight site mutations. These results are discussed in the light of evidence derived from morphological, cytological and allozyme studies.

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Molecular systematics of the genus Senecio L. I: Hybridization in a British polyploid complex

Cited by 48 publications

References 36 publications

Plant introductions, hybridization and gene flow

Plant introductions, hybridization and gene flow

Morphometric and isozyme evidence for the hybrid origin of a new tetraploid radiate groundsel in York, England

Molecular systematics of the genus Senecio L. II: The origin of S. vulgaris L.

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