Einflüsse einer Plasmodiophora brassicae ‐Infektion auf die Wurzelanatomie des Rapses

The anatomy of five‐week old roots of rape ( Brassica napus L.) infected by Plasmodiophora brassicae Wor. was studied and compared with corresponding non‐infected roots using light microscopy and scanning electron microscopy techniques. The club‐root gall was characterized by atypically initiated vascular strands separated by large, proliferating parenchymatic cells originating from secondary tissues and infected by the parasite. Similarities in the anatomy of the club‐root gall and storage roots of Brassica are discussed together with aspcets of the pathogen control of the host anatomy.