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A genetic map of an interspecific cross in Allium based on amplified fragment length polymorphism (AFLPTM) markers
- A. W. van Heusden, J. V. van Ooijen, R. Vrielink-van Ginkel, W. Verbeek, W. Wietsma, Chris Kik
- BiologyTheoretical and Applied Genetics
Segregation of 692 polymorphic AFLPTM (amplified fragment length polymorphism) fragments was determined in an F2 of the interspecific cross A. roylei x A. cepa; the level of polymorphic markers between different A.cepa accessions was4-8%.
Crossing experiments in Allium L. section Cepa
The Wallace effect, which is the development of internal isolation barriers as such, is likely to have taken place in the evolution of Allium section Cepa, with high isolation barriers found between the related species A. cepa and A. roylei of section Rhizirideum.
Screening for resistance to anthracnose (Colletotrichum gloeosporioides Penz.) in Allium cepa and its wild relatives
A genetic analysis of the resistance present in A. roylei to the Brazilian isolated revealed that it is dominantly inherited and most probably determined by more than one gene.
Introgression of leaf blight resistance from Allium roylei Stearn into onion (A. cepa L.)
Segregation analysis in BC1 and F2 progenies from interspecific hybrids between Allium roylei and A. cepa demonstrated that leaf blight resistance is conditioned by one single dominant gene from A. royleo, unlinked to the genes Pd1 and Pd2 determining downy mildew resistance.
Identification of the volatile component(s) causing the characteristic foxy odor in various cultivars of Fritillaria imperialis L. (Liliaceae).
- J. Helsper, M. Bücking, S. Muresan, J. Blaas, W. Wietsma
- Chemistry, MedicineJournal of agricultural and food chemistry
- 8 June 2006
To identify the component(s) causing the foxy odor, characteristic for some Fritillaria imperialis cultivars, the headspace of flower bulbs was analyzed using gas chromatography-olfactometry (GC-O)…
Linkage of downy mildew resistance genes Pd1 and Pd2from Allium roylei Stearn in progeny of its interspecific hybrid with onion (A. cepa L.)
Male meiosis of the interspecific hybrid between Allium roylei and A. cepa is concluded to be a closer relative of A.cepa than A. fistulosum, and the prospects of exploiting A. royle i in onion breeding seem very promising.
Introgression of characters from Allium roylei Stearn into A. cepa L.
Inheritance of resistance to downy mildew (Peronospora destructor [Berk.] Casp.) from Allium roylei Stearn in the backcross Allium cepa L. X (A. roylei X A. cepa)
The occurrence in the backcross offspring of plants having a morphology similar to A. cepa without showing symptoms of downy mildew opens perspectives for breeding P. destructor-resistant onion varieties.
Development of bio-assays and screening for resistance to beet armyworm (Spodoptera Exigua Hübner) in Allium cepa L. and its wild relatives
The results obtained so far suggest that introduction of resistance to S. exigua via the exploitation of variation for resistance to the beet armyworm in A. roylei is unclear and that genetic engineering using Cry sequences could provide a way forward.
Phylogenetic relationships within Fritillaria section Petilium based on AFLP fingerprints
- W. Wietsma, Daniël Deinum, H. Teunissen, R. G. Berg
- BiologyPlant Systematics and Evolution
- 1 March 2015
The results of the AFLP’s and the crossing experiments show that within F. imperialis two varieties can be recognised, one variety containing representatives that possesses the so called ‘foxy’ smell, and a second variety with odourless representatives.