Selection for Pathogenicity to Strawberry in Populations of Colletotrichum gloeosporioides from Native Plants

Colletotrichum gloeosporioides causes a serious crown rot of strawberry and some isolates from native plants are pathogenic to strawberry. C. gloeosporioides from lesions on wild grape and oak were sampled at two sites adjacent to commercial strawberry fields in Florida and two distant sites. Random...

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Veröffentlicht in:Phytopathology 2007-09, Vol.97 (9), p.1130-1140
Hauptverfasser: MacKenzie, S.J, Seijo, T.E, Legard, D.E, Timmer, L.W, Peres, N.A
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container_issue 9
container_start_page 1130
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creator MacKenzie, S.J
Seijo, T.E
Legard, D.E
Timmer, L.W
Peres, N.A
description Colletotrichum gloeosporioides causes a serious crown rot of strawberry and some isolates from native plants are pathogenic to strawberry. C. gloeosporioides from lesions on wild grape and oak were sampled at two sites adjacent to commercial strawberry fields in Florida and two distant sites. Random amplified polymorphic DNA (RAPD) marker data and restriction enzyme digests of amplified rDNA were used to determine whether isolates were from the same C. gloeosporioides subgroup that infects strawberry. There were 17 to 24 native host isolates from each site that clustered with a group of strawberry crown isolates based on RAPD markers. Among strawberry isolates, there were two rDNA genotypes identified by restriction enzyme analysis. Both genotypes were present among native host isolates sampled from all four sites. There was some evidence that the different rDNA genotypes differentiated two closely related subpopulations, although the proportion of pathogenic isolates from native hosts among the two different genotypes was not different. The incidence of isolates pathogenic to strawberry was greater at sites close to strawberry fields relative to sites distant from strawberry fields for isolates with a BstUI(-)/MspI(+) rDNA genotype (44 versus 13%), a BstUI(+)/MspI(-) genotype (57 versus 16%), or when both genotypes were analyzed together (46 versus 15%). Based on these results, it appears that the C. gloeosporioides subgroup that causes crown rot on strawberry is widely distributed in Florida and that selection for pathogenicity on strawberry occurs in the area where this host is grown in abundance.
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C. gloeosporioides from lesions on wild grape and oak were sampled at two sites adjacent to commercial strawberry fields in Florida and two distant sites. Random amplified polymorphic DNA (RAPD) marker data and restriction enzyme digests of amplified rDNA were used to determine whether isolates were from the same C. gloeosporioides subgroup that infects strawberry. There were 17 to 24 native host isolates from each site that clustered with a group of strawberry crown isolates based on RAPD markers. Among strawberry isolates, there were two rDNA genotypes identified by restriction enzyme analysis. Both genotypes were present among native host isolates sampled from all four sites. There was some evidence that the different rDNA genotypes differentiated two closely related subpopulations, although the proportion of pathogenic isolates from native hosts among the two different genotypes was not different. The incidence of isolates pathogenic to strawberry was greater at sites close to strawberry fields relative to sites distant from strawberry fields for isolates with a BstUI(-)/MspI(+) rDNA genotype (44 versus 13%), a BstUI(+)/MspI(-) genotype (57 versus 16%), or when both genotypes were analyzed together (46 versus 15%). 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source Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; Alma/SFX Local Collection; American Phytopathological Society Journal Back Issues
subjects alternative hosts
Biological and medical sciences
Colletotrichum gloeosporioides
crown rot
disease incidence
disease reservoirs
Fragaria
Fragaria ananassa
Fundamental and applied biological sciences. Psychology
Fungal plant pathogens
genetic markers
genotype
Glomerella cingulata
host plants
host range
natural selection
pathogen identification
pathogenicity
Phytopathology. Animal pests. Plant and forest protection
plant pathogenic fungi
random amplified polymorphic DNA technique
ribosomal DNA
strains
strawberries
Vitaceae
wild plants
title Selection for Pathogenicity to Strawberry in Populations of Colletotrichum gloeosporioides from Native Plants
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