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  • 1
    Electronic Resource
    Electronic Resource
    Phylogeny reconstruction and hybrid analysis in Allium subgenus Rhizirideum (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 1000-1009 
    Details
    ISSN: 1432-2242
    Keywords: Key words Allium subgenus Rhizirideum ; Allium cepa ; Allium roylei ; AFLP ; Onion ; Phylogeny reconstruction ; Hybrid Distance ; nDNA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Amplified fragment length polymorphisms (AFLPs) for assessing nuclear DNA diversity have been used for the reconstruction of the phylogeny and evolution of several sections of Allium subgenus Rhizirideum. A dataset of 355 characters for 33 accessions belonging to 20 species has been compiled. The band-sharing of five interspecific hybrids and of an F2 population between Allium cepa and Allium roylei with their parents indicated a heterozygosity level between 6 and 14%, which allows the use of dominant markers such as AFLPs for phylogeny reconstruction. A majority rule consensus tree based on 56 most-parsimonius trees (CI = 0.528) revealed a separate clade for each of the sections, Cepa, Rhizirideum and Schoenoprasum, and one clade combining the sections Oreiprason and Petroprason. An unweighted pair group mean average (UPGMA)-based dendrogram showed the same subdivision. The trees and the ’Hybrid Distance’ approach both supported the assumption of a hybrid origin for A. roylei with considerable subsequent secondary evolution. The establishment of three alliances in the section Cepa and the close relationship of sections Oreiprason and Petroprason are now confirmed. The predictions of the Soybean domestication scenario, i.e. selection of a crop from one progenitor with subsequent narrowing of the genetic diversity of the crop, which applies to the cultigens A. cepa and Allium fistulosum, is supported by the Hybrid Distance approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051381
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  • 2
    Electronic Resource
    Electronic Resource
    A genetic map of an interspecific cross in Allium based on amplified fragment length polymorphism (AFLPTM) markers (2000)
    Springer
    Theoretical and applied genetics 100 (2000), S. 118-126 
    Details
    ISSN: 1432-2242
    Keywords: Key words AFLP ; Allium roylei ; Allium cepa ; Downy mildew ; Genetic linkage map ; Onion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Segregation of 692 polymorphic AFLPTM (amplified fragment length polymorphism) fragments was determined in an F2 of the interspecific cross A. roylei x A. cepa. Two different enzyme combinations were used, PstI/MseIand EcoRI/MseI; in the latter one extra selective nucleotide was added to the MseI primer. The map based on A. cepa markers consisted of eight linkage groups with 262 markers covering 694 cM of the expected 800 cM. The map based on A. roylei markers comprised 15 linkage groups with 243 markers and had a length of 626 cM. The two maps were not integrated, and 25% of the markers remained unlinked. One of the alliinase genes and a SCAR marker linked to the disease resistance gene to downy mildew are present on this map. Of the AFLP markers, 50—80% were polymorphic between A. cepa and A. roylei; the level of polymorphic markers between different A. cepa accessions was4-8%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050017
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  • 3
    Electronic Resource
    Electronic Resource
    Independent segregation of two isozyme markers and inter-plant differences in nuclear DNA content in the interspecific backcross (Allium fistulosum L. × A. cepa L.) × A. cepa L. (1991)
    Springer
    Euphytica 55 (1991), S. 151-156 
    Details
    ISSN: 1573-5060
    Keywords: Allium cepa ; Allium fistulosum ; isozyme analysis ; isozyme markers ; flow cytometry ; DNA content ; introgression ; interspecific backcross
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary From backcrosses of three interspecific hybrids (A. fistulosum x A. cepa) with a. cepa 14 diploid and 2 triploid plants were recovered. In this BC1 population introgression of A. fistulosum genetic material into the A. cepa nuclear genome was studied using two isozyme markers: Got-1 and Got-2. Both loci carried two alleles. A. cepa was monomorphic for both markers. A. fistulosum was polymorphic for Got-2. Based on their Got isozyme pattern seven out of the 14 diploid BC1 plants had a recombinant genotype. The loci appeared to be unlinked. Differences were observed in nuclear DNA contents between the diploid BC1 plants, indicating that gametes produced by the interspecific hybrids contained different combinations of chromosomal material from A. cepa and A. fistulosum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025228
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