RESISTANCE TO LEPTOSPHAERIA MACULANS AND ALTERNARIA BRASSICICOLA TRANSFERRED INTO BRASSICA NAPUS BY INTERSPECIFIC AND INTERGENERIC HYBRIDIZATION
H WINTER, A DIESTEL and MD SACRISTÁN
Institute of Applied Genetics, Freie Universität Berlin, Albrecht-Thaer-Weg 6, 14195 Berlin, Germany
Background and objectives
Materials and methods
The different backcross progenies were analysed according to resistance behavior to the pathogens using various inoculation methods. They were examined cytologically and characterized by isozyme, erucic acid and DNA patterns.
Results and conclusions
In contrast to this, the plants of the first backcross generation of B. napus and B. elongata almost completely lost the increased level of resistance to A. brassicicola but showed the high adult plant L. maculans resistance of B. elongata.
In an extent not exceeding 5% of the plants of a line dihaploids obtained from B. napus-B. juncea backcross lines showed characteristic exceptions from the line's regular behaviour concerning morphology, flowering behaviour, chromosome numbers and isozyme patterns. These phenomena are probably caused by meiotic pairing irregularities due to the multitude of homoeologies within and among the three Brassica genomes.