Journal
PLANT PATHOLOGY
Volume 55, Issue 5, Pages 671-678Publisher
WILEY
DOI: 10.1111/j.1365-3059.2006.01436.x
Keywords
anthracnose; Colletotrichum gloeosporioides; food yams; isolate-specific resistance; screening
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Reactions of 60 water yam (Dioscorea alata) cultivars to three isolates of the yam anthracnose fungal pathogen (Colletotrichum gloeosporioides) were evaluated using tissue culture-derived whole-plant assay. Three disease parameters: single score on a scale of 0-6 at the seventh day after inoculation (SD7); area under the disease progress curve (AUDPC); and disease progress rate (R-d) were compared, and cultivars were classified into disease-response groups using a rank-sum method based on AUDPC scores for the two most virulent isolates. A wide range of variation in resistance of the D. alata cultivars, and significant effects of pathogen isolate and isolate-cultivar interactions, were observed for all disease parameters. The three disease parameters were positively correlated; however, four cultivars showed great dispersions from the regression lines for comparisons of SD7 with the multiple assessments based AUDPC and R-d. The 60 cultivars were separated into resistant (n = 12), moderately resistant (n = 19), moderately susceptible (n = 18) and susceptible (n = 11) groups. The potential of the tissue culture-derived whole-plant assay to resistance breeding programmes and further understanding of the yam anthracnose pathosystem is discussed.
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