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Histological characterisation of the incompatible interaction between Arabidopsis thaliana and the obligate biotrophic pathogen Plasmodiophora brassicae

Published online by Cambridge University Press:  01 February 2000

Peter KOBELT ,
Johannes SIEMENS  and
María Dolores SACRISTÁN
Peter KOBELT
Affiliation:
Institute of Applied Genetics, Free University of Berlin, Albrecht-Thaer-Weg 6, 14195 Berlin, Germany. E-mail: siemensj@zedat.fu-berlin.de
Johannes SIEMENS
Affiliation:
Institute of Applied Genetics, Free University of Berlin, Albrecht-Thaer-Weg 6, 14195 Berlin, Germany. E-mail: siemensj@zedat.fu-berlin.de
María Dolores SACRISTÁN
Affiliation:
Institute of Applied Genetics, Free University of Berlin, Albrecht-Thaer-Weg 6, 14195 Berlin, Germany. E-mail: siemensj@zedat.fu-berlin.de
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Abstract

The obligate biotrophic pathogen Plasmodiophora brassicae induces cataplastic galls in the roots of various species of the Brassicaceae. The ecotypes Ze-0, Tsu-0, and Ta-0 of Arabidopsis thaliana carry alleles of a dominant single gene (RPB1) for resistance against this pathogen. The pathotype-specific resistance reactions in the roots were accompanied by a hypersensitive response. Infected cells were surrounded by necrotic boundaries and thereby the pathogen growth was restricted. The pathogen could induce hyperplasia and hypertrophy to a slight extent and develop spores within mini-galls surrounded by the necrotic cells, if it was able to colonise meristematic tissue. Ecotype Ze-0 showed the highest level of resistance to P. brassicae isolate ‘e’ as indicated by the very limited number of infected cells, whereas the resistance of the ecotype Ta-0 was rated lower. The results are discussed in relation to the interaction of the pathogen with Brassica crops.

Type
Research Article
Information
Mycological Research , Volume 104 , Issue 2 , February 2000 , pp. 220 - 225
Copyright
© The British Mycological Society 2000

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