Roman Gaebelein

Julius Kühn-Institut · Institute for Breeding Research on Agricultural Crops

Late blight remains the most devastating disease in potato cultivation. The best protection against this disease could be achieved by durably resistant cultivars, but these do not exist at present. To advance resistance breeding, the search for resistant wild potato species and the characterization of their resistance is important. There have recen...

Key message Disomic alien chromosome addition Brassica carinata lines with super-high erucic acid content were developed through interspecific hybridization with B. juncea and characterized using molecular, cytological and biochemical techniques. Abstract Brassica carinata [A.] Braun (BBCC, 2n = 34) is a climate-resilient oilseed. Its seed oil is...

Many flowering plant taxa contain allopolyploids which share one or more genomes in common. In the Brassica genus, crop species B. juncea and B. carinata share the B genome, with 2n = AABB and 2n = BBCC genome complements respectively. Hybridization results in 2n = BBAC hybrids, but the fate of these hybrids over generations of self‐pollination has...

High frequencies of homoeologous and even non-homologous chromosome recombination in Brassica hybrids can transfer useful traits between genomes, but also destabilise synthetic allopolyploids. We produced triploid hybrids (2n = 3x = ABC) from the cross B. napus (rapeseed, 2n = 4x = AACC) × B. nigra (black mustard, 2n = 2x = BB) by embryo rescue and...

Synthetic allohexaploid Brassica hybrids (2n = AABBCC) do not exist naturally, but can be synthesized by crosses between diploid and/or allotetraploid Brassica species. Using these hybrids, we aimed to identify how novel allohexaploids restore fertility and normal meiosis after formation. Chromosome inheritance, genome structure, fertility and meio...

Allohexaploid Brassica hybrids (2n = AABBCC) have been the subject of plant breeding and research for many years, both to increase our understanding of polyploid plant evolution and to benefit plant breeding. This review summarizes and evaluates the different approaches to producing these hybrids using the six interrelated crop species (three diplo...

Quartet pollen, where pollen grains remain attached to each other post‐meiosis, are useful for tetrad analysis, crossover assessment and centromere mapping. We observed the quartet pollen phenotype for the first time in the agriculturally significant Brassica genus, in an experimental population of allohexaploid Brassica hybrids derived from the cr...

Advanced generations of allohexaploid Brassica show promise for genome stabilisation Background Polyploidy and interspecific hybridization processes in nature contribute to new, diverse and successful species and may be useful in breeding new allohexaploid (2n = AABBCC) crop types with increased hybrid vigour in Brassica. However, in early generati...

Background The genus Brassica includes some of the most important vegetable and oil seed crops in the world. The diploid species B. rapa (2n = AA; Chinese cabbage/turnip), B. nigra (2n = BB; black mustard) and B. oleracea (2n = CC; cabbage) formed interspecific hybrids resulting in the development of B. napus (AACC; rapeseed), B. juncea (AABB; Indi...