Gerhard Wenzel

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In order to construct an RFLP map of barley, two populations were analyzed using 251 genomic and cDNA markers: one population comprised 71 F1 antherderived double haploid (DH) individuals of an intraspecific cross (IGRI x FRANKA), and the other 135 individuals of an interspecific F2/F3 progeny (VADA x H. spontaneum). The distribution of nonrepetitive clones(More)
Two hundred and fifty doubled haploid lines were studied from a cross between two 2-row winter barley varieties. The lines were evaluated for several characters in a field experiment for 3 years on two locations with two replications. From a total of 431 RFLP probes 50 were found to be polymorphic and subsequently used to construct a linkage map.(More)
 One hundred and eighty dihaploid clones used for protoplast fusions, and 144 tetraploid German potato cultivars were analysed for their cytoplasms using 11 homologous mt DNA-probes, and were classified as mitochondrial (mt) types α, β, γ, δ, and ɛ according to their RFLP patterns. From the 4x cultivars, 79 had the typical mt-type β of Solanum tuberosum(More)
Distinct parental cytoplasms were combined in symmetric tetraploid hybrids of potato by somatic cell fusion. This allowed, in the presence of nearly isogenic nuclear genomes, to estimate the contribution of mitochondrial (mt) and chloroplast (cp) genomes to starch content. Analysis of mt-cp configurations in the complete gene pool of german potato cultivars(More)
Amplified fragment length polymorphism (AFLP) markers with a total of 256 EcoRI + ANN - MseI + CNN primer combinations were investigated employing the common wheat cultivar Triticum aestivum 'Chinese Spring.' On average, 103 fragments per primer combination were amplified, ranging from a maximum of 226 fragments to a minimum of 18 fragments. The primer(More)
Molecular markers were identified in common wheat for the Pm24 locus conferring resistance to different isolates of the powdery mildew pathogen, Erysiphe graminis DM f. sp. tritici (Em. Marchal). Bulked segregant analysis was used to identify amplified fragment length polymorphism (AFLP) markers and microsatellite markers linked to the gene Pm24 in an F2(More)
In order to characterise quantitative trait loci (QTLs) for Type I and Type II resistance against Fusarium head blight (FHB) in wheat, a population of recombinant inbred lines derived from the cross Cansas (moderately resistant)/Ritmo (susceptible) was evaluated in spray-inoculated field trials over three seasons. Map-based QTL analysis across environments(More)
In traditional vine areas, the production should present a typicity that partly depends on the grapevine variety. Therefore, vine improvement is considered difficult because of the limited choice in the natural variability of the cultivars within the limits of their characteristics. A possibility to circumvent this problem is the use of somatic variability.(More)
Segregation analysis of resistance to powdery mildew in a F2 progeny from the cross Chinese Spring (CS) × TA2682c revealed the inheritance of a dominant and a recessive powdery mildew resistance gene. Selfing of susceptible F2 individuals allowed the establishment of a mapping population segregating exclusively for the recessive resistance gene. The(More)
The inheritance of extreme resistance to PVY (Ry sto) by a single dominant locus was confirmed by obtaining a 1:1 segregation ratio in a virus inoculation test with 28 resistant (Ryry) to 29 susceptible (ryry) anther culture-derived dihaploid lines (2n=2x=24) from cv. “Assia” (2n=4x=48) having extreme resistance derived from Solanum stoloniferum in simplex(More)