Pyrenophora teres f. teres classes of virulence based on cluster analysis of six dimensions of correspondence analysis. Pptt1 to Pptt10 represent pathotype designations
From the output of the correspondence analysis, six dimensions
(representing 96% of the variability) were subjected to cluster
analysis using a complete linkage method to classify isolate
virulence into classes of virulence (Figs. 4 and 9). .
The dendrogram illustrated in Fig. 4 is a hierarchical
grouping of classes of pathogen virulence.
The dendogram in Fig. 4 explains 96% of variability based on
six dimensions of the correspondence analysis.
Virulence of the Ptt isolates were classified into four classes
when the maximum distance was truncated at 1.7 (Fig. 4).
All isolates were clustered into several distinct virulence
groups but when localized, the 10 identified pathotypes were found
to be not necessarily clustered into distinct virulence groups
based on the correspondence analysis (Figs. 3 and 4).
For example, Merchouch-07 (Pptt7) and Ouled Amar (Pptt3) have
different phenotypic reactions (Table 8), but are in the same
cluster in Fig. 4.
Similar results were found for other pathotype combinations such as
Pptt1 and Pptt8, and Pptt5 and Pptt6 (Fig. 4)..
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