scholarly journals Occurrence of strobilurin-resistant strains of Colletotrichum gloeosporioides (Glomerella cingulata), the causal fungus of strawberry anthracnose.

2008 ◽  
Vol 74 (2) ◽  
pp. 114-117 ◽  
Author(s):  
M. INADA ◽  
H. ISHII ◽  
W. H. CHUNG ◽  
T. YAMADA ◽  
J. YAMAGUCHI ◽  
...  
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Glomerella Cingulata ◽  
Causal Fungus ◽  
Strawberry Anthracnose ◽  
Resistant Strains

Detection of Thiophanate-methyl-resistant Strains in Diplocarpon mail, Causal Fungus of Apple Blotch

2000 ◽  
Vol 66 (1) ◽  
pp. 82-85 ◽  
Author(s):  
Shuhei TANAKA ◽  
Nobue KAMEGAWA ◽  
Shin-ichi ITO ◽  
Mitsuro KAMEYA-IWAKI
Keyword(s):  
Thiophanate Methyl ◽  
Causal Fungus ◽  
Resistant Strains

scholarly journals Caracterização da agressividade de isolados de Colletotrichum de maracujá amarelo com marcadores bioquímico, fisiológico e molecular

2007 ◽  
Vol 32 (4) ◽  
pp. 318-328 ◽  
Author(s):  
Luiz Carlos C. Almeida ◽  
Rildo S.B. Coêlho
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Glomerella Cingulata ◽  
Colletotrichum Spp

A antracnose é a doença pós-colheita mais importante do maracujá amarelo, cujo agente etiológico, no Brasil, foi identificado como Colletotrichum gloeosporioides. Visando caracterizar o patógeno, foram obtidos 33 isolados de três regiões produtoras do estado de Pernambuco. Critérios morfológicos como cor de colônia, forma e dimensão de conídios, a produção de peritécio e o uso de primers específicos para C. acutatum, C. gloeosporioides e "Colletotrichum de Passiflora" permitiram identificar Glomerella cingulata patótipo 1, G. cingulata patótipo 2, Colletotrichum sp. de Passiflora e Colletotrichum sp. de maracujá amarelo. Inoculações em maracujá amarelo possibilitaram separar os isolados em dois grupos, um de agressividade alta (GA-1) e outro de agressividade baixa (GA-2). Os marcadores bioquímicos como atividade enzimática amilolítica, celulolítica, lipolítica e proteolítica assim como o marcador fisiológico crescimento micelial não separaram os isolados pela agressividade. O padrão de marcas geradas pela amplificação dos DNAs dos isolados usando primers RAPD evidenciou que os isolados do GA-1 variaram menos geneticamente entre si do que os isolados do GA-2, demonstrando que os do GA-1 evoluíram mais recentemente. A amplificação do DNA dos isolados com o primer OPA-9 gerou um marcador que possibilitou caracterizar 85,7% dos isolados do GA-1 e também alguns isolados do GA-2 com agressividade próxima às dos isolados do GA-1, e por isto o primer OPA-9 pode ser usado para caracterizar isolados de Colletotrichum spp. de alta agressividade em programa de resistência genética.

Differentiation of Isolates of Glomerella cingulata and Colletotrichum spp. Associated with Glomerella Leaf Spot and Bitter Rot of Apples Using Growth Rate, Response to Temperature, and Benomyl Sensitivity

2005 ◽  
Vol 6 (1) ◽  
pp. 6 ◽  
Author(s):  
Eugenia González ◽  
Turner B. Sutton
Keyword(s):  
Growth Rate ◽  
Leaf Spot ◽  
Molecular Diversity ◽  
Colletotrichum Gloeosporioides ◽  
Glomerella Cingulata ◽  
Optimum Growth Temperature ◽  
Bitter Rot ◽  
Colletotrichum Spp ◽  
Glomerella Leaf Spot ◽  
Response To Temperature

Cultural characteristics were investigated as a way to distinguish isolates of Glomerella cingulata and Colletotrichum spp. associated with Glomerella leaf spot and bitter rot of apples from those that cause only bitter rot. The growth rate, response to temperature, and benomyl sensitivity of 27 isolates of Glomerella cingulata, 12 isolates of Colletotrichum gloeosporioides, and 7 isolates of C. acutatum, collected from apple orchards located in the U.S. and Brazil and previously characterized based on morphology, vegetative compatibility, and mitochondrial DNA (mtDNA) haplotypes, were determined. These isolates represent the genetic and molecular diversity within isolates of C. gloeosporioides, C. acutatum, and G. cingulata from apples found in a previous study. Slower growth, lower optimum growth temperature, and less sensitivity to benomyl distinguished isolates of C. acutatum from isolates of G. cingulata and C. gloeosporioides. However, growth rate and benomyl sensitivity were not useful for distinguishing between G. cingulata and C. gloeosporioides or differentiating isolates of G. cingulata that cause leaf spot and bitter rot from those that only cause bitter rot. Accepted for publication 17 May 2005. Published 19 July 2005.

Phenotypic variation for disease resistance and virulence within naturalized populations of Stylosanthes humilis and Colletotrichum gloeosporioides

1987 ◽  
Vol 38 (4) ◽  
pp. 717 ◽  
Author(s):  
T Vinijsanun ◽  
DF Cameron ◽  
JAG Irwin ◽  
A Barnes
Keyword(s):  
First Generation ◽  
Colletotrichum Gloeosporioides ◽  
Fungal Isolate ◽  
Single Spore ◽  
Pathogen Virulence ◽  
Stylosanthes Humilis ◽  
Causal Fungus ◽  
Selection For ◽  
Fourth Experiment ◽  
A Site

The extent of variation for host disease reaction and pathogen virulence was studied in naturalized populations of Stylosanthes hurnilis and Colletotrichurn gloeosporioides, the causal fungus of an anthracnose disease of Stylosanthes spp. Diseased plants (S0) were collected from the field at three sites (Townsville, Wrotham Park and Niall) in North Queensland, and first generation selfed (S1) progenies (host-lines) and single spore fungal cultures were grown for each of the collections made. Within a site, all host-lines were inoculated with each fungal isolate from that site, and a fourth experiment was conducted with representative host-pathogen combinations from each site. Sufficient seed was obtained to allow testing of 12, 10 and 8 collections from Niall, Wrotham Park and Townsville respectively. Significant variation (P < 0.01) between disease severity values for host-line means, fungal isolate means and host-line/fungal isolate interactions was found in all four experiments. Differences between fungal isolate means were the main source of variation in three of the four experiments. Both the differences in virulence within the pathogen population and the differences in resistance of the hostlines appeared to be quantitatively inherited. One host-line from Wrotham Park was significantly more resistant than the susceptible check, cv. Paterson, in two replicated experiments indicating that selection for some improvement in resistance within the naturalized populations should be possible. However, none of the host-lines from the Townsville and Niall sites were significantly more resistant than Paterson, suggesting that little natural selection for resistance has occurred within the naturalized host populations over the 10 years following the first outbreak of the disease in northern Australia.

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