Application of cluster analysis for establishment of genetic similarity in gene-for-gene host-parasite relationships
1987
Lebeda, A. | Jendrulek, T.
Genetic similarity and/or dissimilarity among virulence phenotypes of phytopathogenic organisms and generally in gene-for-gene relationships can be exactly expressed by cluster analysis. The present paper deals with the application of a definite hierarchical agglomerative clustering method based on mu-connected clusters as a means for describing genetic structure of virulence in a set of 48 physiological races (isolates) of Bremia lactucae (lettuce downy mildew). A dendrogram and a minimum spanning tree were used to distinguish between virulence phenotypes of B. lactucae. Further application of the methods of numerical taxonomy to phytopathology is briefly discussed
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