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Vegetative compatibility groups and pathogenicity variation among isolates of Fusarium oxysporum f.sp. melonis.
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 Authours
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Il-Pyung Ahn[0] and Yong-Hwan Lee[0][*] |
| Title |
Vegetative compatibility groups and pathogenicity variation among isolates of Fusarium oxysporum f.sp. melonis. |
| Journal |
The Plant Pathology Journal, 2000 (16) ~ |
Abstract
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A total of 90 isolates of Fusarium oxysporum f. sp. melonis,
the causal agent of oriental melon (Cucumis melo
var. makuwa) wilt, was isolated from symptomatic tissues
of oriental melon from 4 provinces in Korea. These
isolates were grouped into vegetative compatibility
groups (VCGs) by demonstrating heterokaryosis through
complementation using nitrate nonutilizing (nit) mutants.
No self-incompatibility was observed in any of isolates.
All isolates were grouped into 3 VCGs; A, B, and C. Isolates
belonging to VCG A and VCG B accounted for
87% and 91% of the fungal population collected in 1991
and 1993, respectively. As the increment of cultivation
period in the same field, the proportion of isolates
belonging to VCG B increased whereas that of isolates
belonging to VCG A decreased. Mean virulence of a
total population increased as the increment of cultivation
period in the same field. Isolates belonging to VCG
B showed the highest increment of virulence. These data
suggest that replanting of a host plant in the same field
may cause increase of virulence in the pathogens. Furthermore,
virulence of F. oxysporum f. sp. melonis isolates
is related to the VCGs. |
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