Chromosome number and morphology of some introduced Strylosanthes species

Cameron, DF

doi:10.1071/ar9670375

Cited by 19 publications

(13 citation statements)

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“…Styposanthes and Stylosanthes, based on the presence of rudimentary secondary floral axis and two inner bracteoles in the former and no such axis and only one inner bracteole in the latter. Most species of Stylosanthes are diploid (2n = 20) but polyploid (allo) species (2n = 40, 60) also exist [3]. Sectt.…”

Section: Introductionmentioning

confidence: 99%

Identification of Diploid Stylosanthes seabrana Accessions from Existing Germplasm of S. scabra Utilizing Genome-Specific STS Markers and Flow Cytometry, and Their Molecular Characterization

Chandra

Kaushal

2009

Mol Biotechnol

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Stylosanthes seabrana (Maass and 't Mannetje) (2n = 2x = 20), commonly known as Caatinga stylo, is an important tropical perennial forage legume. In nature, it largely co-exist with S. scabra, an allotetraploid (2n = 4x = 40) species, sharing a very high similarity for morphological traits like growth habit, perenniality, fruit shape and presence of small appendage at the base of the pod or loment. This makes the two species difficult to distinguish morphologically, leading to chances of contamination in respective germplasm collections. In present study, 10 S. seabrana accessions were discovered from the existing global germplasm stock of S. scabra represented by 48 diverse collections, utilizing sequence-tagged-sites (STS) genome-specific markers. All the newly identified S. seabrana accessions displayed STS phenotypes of typical diploid species. Earlier reports have conclusively indicated S. seabrana and S. viscosa as two diploid progenitors of allotetraploid S. scabra. With primer pairs SHST3F3/R3, all putative S. seabrana yielded single band of approximately 550 bp and S. viscosa of approximately 870 bp whereas both of these bands were observed in allotetraploid S. scabra. Since SHST3F3/R3 primer pairs are known to amplify single or no band with diploid and two bands with tetraploid species, the amplification patterns corroborated that all newly identified S. seabrana lines were diploid in nature. Flow cytometric measurement of DNA content of the species, along with distinguishing morphological traits such as flowering time and seedling vigour, which significantly differ from S. scabra, confirmed all identified lines as S. seabrana. These newly identified lines exhibited high level of similarity among themselves as revealed by RAPD and STS markers (>92% and 80% respectively). Along with the enrichment in genetic resources of Stylosanthes, these newly identified and characterized accessions of S. seabrana can be better exploited in breeding programs targeted to quality.

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Section: Introductionmentioning

confidence: 99%

Identification of Diploid Stylosanthes seabrana Accessions from Existing Germplasm of S. scabra Utilizing Genome-Specific STS Markers and Flow Cytometry, and Their Molecular Characterization

Chandra

Kaushal

2009

Mol Biotechnol

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“…So far, a detailed description of the karyotype of Stylosanthes species was not reported in the literature, except for some general considerations made by Cameron (1967) on six diploid (2n=20), two tetraploid (2n=40) and one hexaploid (2n=60) species.…”

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confidence: 99%

A Cytotaxonomic Study in Twelve Brazilian Taxa of Stylosanthes Sw., Leguminosae.

1993

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“…The ploidy cited for the 2 species is correct; however it in no way supports their contention of dual ploidy in S. scabra. Rather, Vanni and Fernandez (2011) use this confusing statement to support their claim that: "ploidy levels are not valid criteria for species distinction in the genus Stylosanthes, as S. scabra has been reported to be one of the few species with diploid (2n = 20) and tetraploid (2n = 40) genotypes (Cameron 1967)." This is not the case.…”

Section: Ploidymentioning

confidence: 99%

“…This is not the case. In fact, Cameron (1967) determined the chromosome number for a single accession of S. tuberculata (presumably Stylosanthes tuberculata S.F. Blake syn.…”

Section: Ploidymentioning

confidence: 99%

Clearing confusion in <i>Stylosanthes</i> taxonomy: 1. <i>S. seabrana</i> B.L. Maass & 't Mannetje

Cook

Schultze-Kraft

2020

Trop. grassl.-Forrajes trop.

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Stylosanthes seabrana was first formally described as a new species in 2002 following extensive morphological and agronomic characterization, accompanied by genetic and molecular studies. Since then it has been proposed as a synonym of Stylosanthes scabra Vogel. This paper refutes this synonymization and indicates the indisputable evidence that S. seabrana, a diploid, is a likely putative progenitor of the allotetraploid S. scabra.

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Chromosome number and morphology of some introduced Strylosanthes species

Cited by 19 publications

References 0 publications

Identification of Diploid Stylosanthes seabrana Accessions from Existing Germplasm of S. scabra Utilizing Genome-Specific STS Markers and Flow Cytometry, and Their Molecular Characterization

Identification of Diploid Stylosanthes seabrana Accessions from Existing Germplasm of S. scabra Utilizing Genome-Specific STS Markers and Flow Cytometry, and Their Molecular Characterization

A Cytotaxonomic Study in Twelve Brazilian Taxa of Stylosanthes Sw., Leguminosae.

Clearing confusion in <i>Stylosanthes</i> taxonomy: 1. <i>S. seabrana</i> B.L. Maass & 't Mannetje

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