Hybridization of Trifolium accidentale With Two Other Species of Clover

Gibson, Pryce B.; Beinhart, George

doi:10.1093/oxfordjournals.jhered.a107944

Cited by 31 publications

(38 citation statements)

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“…A number of previous studies have addressed the ancestors of T. repens. Based on its ability to cross with some closely related species, Gibson and Beinhart (1969) agreed with Brewbaker and Keim (1953), that diploid Trifolium nigrescens (2n = 16) is one of the ancestors of polyploid T. repens, and that the other ancestor may be Trifolium occidentale (2n = 16). Chen and Gibson (1971) indicated a close karyological and phylogenetic relationship between T. repens, T. nigrescens and T. occidentale, in addition to tetraploid Trifolium uniflorum (2n = 32).…”

Section: Introductionsupporting

confidence: 75%

Ancestors of white clover (Trifolium repens L.), as revealed by isozyme polymorphisms

et al. 2002

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Isozymes were used to study the putative ancestors of white clover ( Trifolium repens L.). Ten enzymes were examined, and 18 loci were resolved via starch-gel electrophoresis for accessions representing T. repens, Trifolium isthmocarpum, Trifolium nigrescens, Trifolium occidentale and Trifolium uniflorum, in addition to two more distantly related species, Trifolium alpinum and Trifolium purseglovei. Nei's genetic identities indicate that T. uniflorum and T. nigrescens are the closest relatives of T. repens. The isozyme data thus support a hypothesis that the two genomes of the tetraploid T. repens could have been derived from hybridization between T. nigrescens and T. uniflorum. This conclusion is further supported by shared alleles between T. repens, T. nigrescens and T. uniflorum. However, the origin of T. repens is somewhat obscured by the presence of shared alleles between T. repens and both T. occidentale and T. isthmocarpum, suggesting that introgression of genes from the latter two species into T. repens may also have taken place. High values of genetic identity are shared between T. occidentale with T. nigrescens and T. uniflorum, also indicative of introgression. Alternatively the presence of shared alleles among the five species may reflect their recent common ancestry.

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Section: Introductionsupporting

confidence: 75%

Ancestors of white clover (Trifolium repens L.), as revealed by isozyme polymorphisms

et al. 2002

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“…Gibson and Beinhart (1969) have suggested that white clover is an amphidiploid, with its constituent diploid species though to be T. nigrescens, a self-incompatible Mediterranean annual and T. occidentale a selfcompatible perennial indigenous to southern England, south-west France and Spain. Other research workers have only indicated T. nigrescens as one of the possible ancestors of white clover (Brewbaker & Keim, 1953;Hovin, 1962).…”

Section: Resultsmentioning

confidence: 99%

Phosphoglucoisomerase variation in Trifolium repens

Michaelson-Yeates

1986

Genetica

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An electrophoretic survey carried out at the PGI/2 locus of white clover revealed the existence of five alleles. These alleles were shown to be controlled by single co-dominant genes, behaving in a normal Mendelian manner. The results also indicate that white clover behaves as an amphidiploid, in which one of its parental species is normally homozygous for the 'c' allele at the PGI/2 locus, whilst the other parent has a multi-allelic series at this locus.

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“…T. oceidentale often grows on exposed sea-cliffs on the fringes of the spray zone, where it is associated with Armeria niaritima L. Desmazeria marina (L.) Druce, and other halophytes (Coombe, 1961). In the Gower Peninsula, where T. oecidentale has recently been discovered in its most northerly known sites in Britain (Kay & Ab-Shukor, 1988), it often grows partly intermingled with T. repens in habitats similar to that of the Southgate sea-cliff population of T. repens in which intermediate levels of salt tolerance were found, T. occidentale, a diploid species, very closely resembles T. repens and is likely to have been the source of one (Gibson & Beinhart, 1969) or perhaps both (Cben & Gibson, 1970a);1971 ;1972) genomes of tetraploid T. repens. The similarity of their karyotypes (Chen & Gibson, 1971) and the homology of chromosomes (Chen & Gibson, 19706) suggest that T. repens and T. occidentale are genetically closely related to one another.…”

Section: I S C Li S S I O Nmentioning

confidence: 99%

Salt tolerance in natural populations of Trifolium repens L.

et al. 1988

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SUM iVl ARYThe salt tolerances of plants from tiatural populations of Trifolium repens L, (White Clover) growing in saline and non-saline sites were compared by root growth tests at a range of NaCl coticentrations. Platits from three saltmarsh sites showed high or very high salt tolerance, with relatively vigorous root growth in 150-200 mM NaCl, Plants with two non-saline inland sites showed little or no tolerance, A sea-clifF population and plants of cv, Gwenda showed intermediate levels of tolerance at low salt concentrations. Halophytic maritime populations may provide material for the development of salt tolerant cultivars of T. repens, a crop plant in which most existing cultivars are thought to be salt-sensitive.

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Hybridization of Trifolium accidentale With Two Other Species of Clover

Cited by 31 publications

References 0 publications

Ancestors of white clover (Trifolium repens L.), as revealed by isozyme polymorphisms

Ancestors of white clover (Trifolium repens L.), as revealed by isozyme polymorphisms

Phosphoglucoisomerase variation in Trifolium repens

Salt tolerance in natural populations of Trifolium repens L.

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