NUMERICAL TAXONOMIC STUDIES ON SPECIES IN <i>ALLIUM</i> SUBGENUS <i>RHIZIRIDEUM</i>

El-Gadi, A.; Elkington, T. T.

doi:10.1111/j.1469-8137.1977.tb02195.x

Cited by 26 publications

(10 citation statements)

References 20 publications

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“…However, all of the economically important Allium species have a basic number of x = 8. In light of the economic significance of Allium, interspecific relationships in the genus have been elucidated through such methods as morphology (El-Gadi and Elkington, 1977), chromosome analysis (Irifune et al, 1995;Pich et al, 1996;Do et al, 2001;Shibata and Hizume, 2002), restriction analysis of the chloroplast genome (Havey, 1991;Yamashita et al, 1998), and genetic marker techniques (Van Raamsdonk et al, 2000;Hao et al, 2002). Nucleotide sequence variation in the ITS (Internal transcribed spacer) region of the 45S rRNA genes has been the candidate of choice for species identification (Jobes and Thien, 1997;Blaxter, 2004;Hajibabaei et al, 2007;Son et al, 2009) and phylogenomic analyses (Hsiao et al, 1995;Yonemori et al, 2002;Liu et al, 2006) because of the relative ease in isolating ITS sequences and their hypervariable nucleotide sequences by PCR amplification.…”

Section: Introductionmentioning

confidence: 99%

Sequence diversification of 45S rRNA ITS, trnH-psbA spacer, and matK genic regions in several Allium species

et al. 2010

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Allium is a very diverse genus with over 600 species distributed worldwide. Haplotype analyses of 45S rRNA ITS, trnH-psbA spacer, and matK gene sequences in 9 Allium species were carried out, subsequent to which phylogenetic relations of the nine species were also analyzed. Of the three genes, the nuclear 45S rRNA ITS sequences showed the highest variation with one haplotype in each species. The other two chloroplast genes revealed that more than one haplotype was present in each species, and each haplotype was present in several of the species. In the matK gene, EcoRI restriction revealed heteroplasmy in which the functional gene retains the EcoRI recognition site while the nonfunctional, pseudogene does not. Phylogenetic patterns were not consistent among the haplotypes of the 45 rRNA ITS, trnH-psbA spacer, and matK genic regions. This phylogenetic incongruency might be due to the presence of multiple haplotypes in each of the chloroplast genes. However, the inconsistency of the phylogenetic relationships, based on the 45S rRNA ITS sequences makes a strong case for further analysis.

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Section: Introductionmentioning

confidence: 99%

Sequence diversification of 45S rRNA ITS, trnH-psbA spacer, and matK genic regions in several Allium species

et al. 2010

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“…Most research has been focused on the improvement of these cultivated species. Especially onion (Allium cepa), as the most important cultigen in the genus, received much attention with respect to the relationship with wild species (El-Gadi and Elkington 1977;Hanelt 1990; van Raamsdonk and de Vries 1992a) and to crossability (Saini and Davis 1967;McCollum 1971McCollum , 1974Gonzalez and Ford-Lloyd 1987; van der Meer and de Vries 1990;van Raamsdonk et al 1992;Keller et al 1996). Diversity studies based on DNA variation have been carried out to study the position of A. cepa (Havey 1992;Wilkie et al 1993;Bradeen and Havey 1995;Linne von Berg et al 1996;Dubouzet et al 1997;Mes et al 1997Mes et al , 1999van Raamsdonk et al 1997van Raamsdonk et al , 2000Fritsch et al 2001;Lilly and Havey 2001).…”

Section: Introductionmentioning

confidence: 99%

Biodiversity assessment based on cpDNA and crossability analysis in selected species of Allium subgenus Rhizirideum

et al. 2003

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The chloroplast DNA diversity of 33 accessions belonging to 16 species of five sections in Allium subgenus Rhizirideum was studied by analysing the sequence of three fragments: the trnL-F intergenic spacer, the rps 16 intron and rbcL (rubisco large subunit). The three sections Cepa, Schoenoprasum and Rhizirideum, representing the majority of the included species, each possess a separate clade after phylogenetic analysis. Exceptions to this general rule are the placement of Allium pskemense (section Cepa) connected to Allium senescens (section Rhizirideum) and Alium roylei, taking an intermediate position between sections Cepa and Schoenoprasum. Both species were located in their own section after nuclear DNA analysis. A range of crossing experiments has been carried out. The different position of A. roylei when comparing cpDNA and nDNA diversity was not confirmed with the production of hybrid seeds after crossing A. roylei with species other than those of section Cepa. The different position of A. pskemense in the cpDNA and the nDNA tree can not be compared to its crossability, since only a few crossing experiments are reported for this species. The hypothesis that a shorter distance between two species in a cpDNA tree compared to their distance in a nDNA tree will indicate interfertility at a certain level, is neither confirmed nor rejected by the currently available results.

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“…The genus Allium is large and complex and is thought to consist of some 500 species (El-Gadi & Elkington, 1977). The flavour and odour components of certain species have 0032-0862/83/0300-0013 $02.00 © 1983 British Society for Plant Pathology been examined and Freeman & Whenham (1975) classified 27 species according tO' whether S-l-propenyl-(Group 1),,S-2-propenyl-(allyl) (Group 2) or S-methyl-L-cysteine sulphoxide (Group 3) was present as the principal flavour and odour precursor.…”

Section: Introductionmentioning

confidence: 99%

Flavor and odour characteristics of species of Allium in relation to their capacity to stimulate germination of sclerotia of Sclerotium cepivorum

Esler

Coley‐Smith

1983

Plant Pathology

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Of many species or cultivars of Allium tested only six ornamental species showed little or no capacity to stimulate germination of sclerotia of Sclerotium cepivorum. All six species had S‐methyl‐L‐cysteine sulphoxide as their principal flavour and odour precursor and their overall flavour and odour levels were low. All other species and cultivars were highly stimulatory, contained considerahle amounts of S‐1 or S‐2‐propenyl‐L‐cysteine sulphoxide as flavour and odour precursors and, with a few exceptions, they possessed high overall flavour and odour levels. These included several species which are thought to be related to cultivated edible forms. With the possible exception of A. caeruleum and A. cyaneum no evidence of resistance to infection by S. cepivorum was detected.

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NUMERICAL TAXONOMIC STUDIES ON SPECIES IN ALLIUM SUBGENUS RHIZIRIDEUM

Cited by 26 publications

References 20 publications

Sequence diversification of 45S rRNA ITS, trnH-psbA spacer, and matK genic regions in several Allium species

Sequence diversification of 45S rRNA ITS, trnH-psbA spacer, and matK genic regions in several Allium species

Biodiversity assessment based on cpDNA and crossability analysis in selected species of Allium subgenus Rhizirideum

Flavor and odour characteristics of species of Allium in relation to their capacity to stimulate germination of sclerotia of Sclerotium cepivorum

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