| Abstrakt: |
Morphologically, conidia ofAlternaria tenuis exhibit dual forms, A and B. Virulent single conidial isolates commonly produce a considerably higher percentage of A-type conidia than B-type conidia. While avirulent isolates produce more B-type than A-type conidia. Genetic factors governing conidial morphology appear to be extranuclear and not genetically linked to virulence. Selection for A-type conidia for six cultural cycles resulted in a rapid and marked segregation of A-type morphology and virulence. |
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