Pathogenicity of Biochemical Mutants of Colletotrichum lagenarium

Investigations on Tomato Anthracnose IV. The Lack of a Correlation between Biochemical Mutations and Virulence in Colletotrichum coccodes (Wallr.) Hugbes1)

“…The data presented in this paper clearly demonstrate that in Colletotrichum coccodes no correlation exists between nutritional mutations and pathogenicity for 30 mutant strains of the fungus, covering at least 19 independent mutations. This situation is quite different from that found in other biological systems employed in the study of host-pathogen relations in plant diseases caused by fungi , DUTTA et al 1960, TUVESON and GARBER 1959, YosHiTO et al 1963. The discrepancy between our results and those of other researchers might be due to the nature of the organs subjected to the pathogenic activity, since in tomato anthracnose the virulence of the mutant strains is to be evaluated on fruits.…”

“…and Halst. (DUTTA et al 1960), deficiencies of some compounds have been found in leaves and stem tissues and the mutants were unable to show their virulence, if the compounds were not supplied externally (KLIISTE et al 1957, DUTTA et al 1960. These findings led the authors to the opinion that the nutritional mutations induced were responsible for the mechanism of pathogenicity in the causal agents.…”

A study of variability in Botrytis /

“…The use of specific amendments in culture media would be more reliable criteria to select desired biotypes from a heterogeneous population of biotypes that constitute many individual phytopathogens. The selective media should not produce a drastic change in the pathogen as is the case when mutagenic agents are employed (5,7,30,32,48,50).…”

Genes in Cochliobolus heterostrophus affecting conidiation and lesion development

“…Similarly, auxotrophic mutants of Colletotrichim lagenarium were avirulent on watermelon (Dutta et al, 1960). Tinline (1963) found that some auxotrophs of Cochliobolus sativus, those requiring methionine or lysine, had reduced pathogenicity on wheat, whereas others that required thiamine, arginine, or pyridoxine were fully pathogenic.…”