The Use of Numerical Methods to Describe Population Differentiation

Jardine, Nicholas; Edmonds, Jennifer M.

doi:10.1111/j.1469-8137.1974.tb02155.x

Cited by 13 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The close relationship amongst these polyploids indicates that they might share the same diploid parent. The idea that S. villosum is the likely tetraploid parent of the hexaploids S. nigrum and S. scabrum has also been supported by evidence from crossing experiments and cytological studies (Soria and Heiser 1961; Heiser et al 1965; Rao et al 1971; Jardine and Edmonds 1974; Edmonds 1977, 1978; Edmonds and Glidewell 1977; Edmonds 1978). Two possibilities still remain: one of the hexaploid species ( S. nigrum and S. scabrum ) evolved first and gave rise to the other or that the two hexaploids originated from the same parents independently (Poczai and Hyvönen 2011).…”

Section: Species Descriptionsmentioning

confidence: 91%

A revision of the Old World Black Nightshades (Morelloid clade of Solanum L., Solanaceae)

Särkinen¹,

Poczai²,

Barboza³

et al. 2018

126

View full text Add to dashboard Cite

The Morelloid clade, also known as the black nightshades or “Maurella” (Morella), is one of the 10 major clades within Solanum L. The pantropical clade consists of 75 currently recognised non-spiny herbaceous and suffrutescent species with simple or branched hairs with or without glandular tips, with a centre of distribution in the tropical Andes. A secondary centre of diversity is found in Africa, where a set of mainly polyploid taxa occur. A yet smaller set of species is found in Australasia and Europe, including Solanum nigrum L., the type of the genus Solanum. Due to the large number of published synonyms, combined with complex morphological variation, our understanding of species limits and diversity in the Morelloid clade has remained poor despite detailed morphological studies carried out in conjunction with breeding experiments. Here we provide the first taxonomic overview since the 19th century of the entire group in the Old World, including Africa, Asia, Australia, Europe and islands of the Pacific. Complete synonymy, morphological descriptions, distribution maps and common names and uses are provided for all 19 species occurring outside the Americas (i.e. Africa, Asia, Australia, Europe and islands of the Pacific). We treat 12 species native to the Old World, as well as 7 taxa that are putatively introduced and/or invasive in the region. The current knowledge of the origin of the polyploid species is summarised. A key to all of the species occurring in the Old World is provided, together with line drawings and colour figures to aid identification both in herbaria and in the field. Preliminary conservation assessments are provided for all species.

show abstract

Section: Species Descriptionsmentioning

confidence: 91%

A revision of the Old World Black Nightshades (Morelloid clade of Solanum L., Solanaceae)

Särkinen¹,

Poczai²,

Barboza³

et al. 2018

126

View full text Add to dashboard Cite

show abstract

“…The 41 morphological characters eventually scored from each plant are listed in Table 1; of these, 20 were essentially qualitative and 2 1 quantitative. The attributes were recorded by non-biologists supplied with simple diagrams of the alternative states, as illustrated in Jardine & Edmonds (1974). The scoring was thus accomplished without any preconceived ideas of the character states t o be expected from any particular accession.…”

Section: Character Selection and Scoringmentioning

confidence: 99%

“…The alloploids were placed nearest t o the plants with which they were most morphologically similar, although, as expected, alloploids derived through hybridisation of a diploid and a polyploid showed a closer relationship to the polyploid parent. The high level of similarity exhibited between alloploid hybrids of S. villosum x S. nodijlorum with S. nigrum was of interest, reflecting the proven ancestry of this hexaploid (see Jardine & Edmonds, 1974;Edmonds & Glidewell, 197?). Heiser et al (1965) noted that their Solanum results were repeatable if the same data and methods were used, but when more characters and a slightly different method were employed, the results also differed.…”

mentioning

confidence: 99%

Numerical taxonomic studies on Solanum L. section Solanum (Maurella)

Edmonds

1978

Botanical Journal of the Linnean Society

View full text Add to dashboard Cite

Population differentiation was studied in 32 accessions belonging to Solanum L. section Solanurn (Maurella); these accessions represented 20 species of four differing ploidy levels. A study of discordance demonstrated that the species exhibit considerable inherent discordant variation; it also provided an estimate of the relative variabilities of characters within these populations, and the consistency with which they differentiate populations.Hierarchic clusters, obtained using the singlelink cluster method, confirmed the relative importance of the different classes of characters used for differentiation within this section. Similarly, the hierarchic clusters generally supported earlier taxonomic decisions.The use of a non-hierarchic cluster method provided the most interesting data on differentiation within the section Solanum, particularly for genome relationships of the polyploid taxa. This clustering pattern fitted well with known genome relationships, while also suggesting putative ancestors for other allopolyploids; suggestions deriving retrospective support from the hierarchic dendrograms. The progenitors suggested by these two clustering methods supported data derived from orthodox taxonomy, comparative morphology, hybridisation studies, the artificial synthesis of polyploids and seed protein band patterns.

show abstract

“…Anderson (1971) presents results that suggest that non-metric multidimensional scaling is preferable to PCA (see also Rohlf 1972 andOrl6ci 1973) and Fasham (1976) has reached similar conclusions. No other comparative studies with biological data appear to have been published, though see Jardine & Edmonds (1974).…”

Section: Data and Techniques Usedmentioning

confidence: 99%

Performance of four ordination techniques assuming three different non-linear species response models

Austin

1976

Vegetatio

View full text Add to dashboard Cite

The Use of Numerical Methods to Describe Population Differentiation

Cited by 13 publications

References 18 publications

A revision of the Old World Black Nightshades (Morelloid clade of Solanum L., Solanaceae)

A revision of the Old World Black Nightshades (Morelloid clade of Solanum L., Solanaceae)

Numerical taxonomic studies on Solanum L. section Solanum (Maurella)

Performance of four ordination techniques assuming three different non-linear species response models

Contact Info

Product

Resources

About