Transfer of resistance to race 2 of plasmodiophora brassicae from brassica napus to cabbage brassica oleracea ssp capitata 3. 1st backcross and f 2 progenies from interspecific hybrids between brassica napus and brassica oleracea ssp capitata
Chiang, M.S.; Chiang, B.Y.; Grant, W.F.
Euphytica 28(2): 257-266
The 1st backcross and F2 progenies from triploid F1 and tetraploid F1 hybrids between B. napus and 2x and 4x B. oleracea ssp. capitata (cabbage) were studied for general morphology, resistance to race 2 of the clubroot pathogen, chromosome number and meiotic chromosome behavior. No linkage was apparent between resistance and major morphological characters. Unreduced gametes played a large part in successful seed formation of the B1 and F2 progeny. B1 plants with low chromosome numbers were selected for recurrent backcross use. Potential anther culture use to extract gametic progenies from resistant B1 and F2 plants with higher chromosome numbers was suggested. Homeologous pairing presence observed in all the plants is considered advantageous for selecting suitable progeny in later generations.