University of Worcester Worcester Research and Publications

Phenotypic and Genotypic Variation in the Interaction between Arabidopsls thaliana and Albugo candida

Holub, E.B., Brose, E., Tör, M. ORCID:, Clay, C., Crute, I. and Beynon, J. (1995) Phenotypic and Genotypic Variation in the Interaction between Arabidopsls thaliana and Albugo candida. Molecular Plant-Microbe Interactions, 8. pp. 214-222. ISSN 0894-0282

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Two biotrophic parasites of the wild crucifer Arabidopsis thaliana (L.) Heynh. are being used to explore the molecular basis and evolution of genotype-specific recognition and host defense. Genes for recognition of Peronospora parasitica (downy mildew) are numerous in A. thaliana and located on four of the five chromosomes as described previously. Genes for recognition of the closely related parasite Albugo Candida (white blister) are described here. In contrast to the former parasite, less than 15% of the host accessions tested were capable of recognizing either of two isolates of A. Candida. The geographic regions represented by these accessions included countries in eastern and western Europe, Asia, North America and Africa. Extensive collections from England and Germany were required to identify examples of incompatible interactions. Phenotypic variation among incompatible interactions included reduced blister formation or complete lack of asexual reproduction by the parasite. Variation in the extent of the host response was also observed. Three host genes for recognition of A. Candida (RAC), each associated with different interaction phenotypes, were identified through inheritance studies with three accessions. One of these genes at locus RACI appeared to be completely dominant, whereas the other two genes were only partially dominant or recessive under certain conditions, possibly including the effect of genetic background. One of the latter two genes defined a second locus RAC2. RACI was mapped to the top arm of chromosome 1 in the 1 cM interval between RFLP markers M254 and M253.

Item Type: Article
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This is an Open Access article. The full-text can be accessed via the Official URL.

Originally deposited as joint division with National Pollen and Aerobiology Research Unit (NPARU)

Uncontrolled Discrete Keywords: incomplete dominance, Peronosporales, gene-for-gene, genotypic variation
Subjects: Q Science > QK Botany
Q Science > QH Natural history > QH301 Biology
Q Science > QH Natural history > QH426 Genetics
Q Science > QR Microbiology
Divisions: College of Health, Life and Environmental Sciences > School of Science and the Environment
Depositing User: Janet Davidson
Date Deposited: 19 Jan 2011 20:05
Last Modified: 17 Jun 2020 16:54

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