Metabolism of the Phenylurea Fungicide, Pencycuron, in Sensitive and Tolerant Strains of &lt;i&gt;Rhizoctonia solani&lt;/i&gt;

功夫, 上山; 康夫, 新木; 内伸, 黒河; 勇, 山口

doi:10.1584/jpestics.18.109

Cited by 12 publications

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“…Two possible mechanisms might be responsible for the differential sensitivity. Ueyama et al reported that isolates of Rhizoctonia AG 4 are able to metabolize pencycuron and are less sensitive, whereas AG3 isolates cannot metabolize this fungicide and are sensitive [35]. Amino acid variations in the targeted genes of fungicides were reported as the other possible mechanism which may cause the differential sensitivity in Colletotrichum spp.…”

Section: Discussionmentioning

confidence: 99%

Global Distributions of Clarireedia Species and Their In Vitro Sensitivity Profiles to Fungicides

Zhang

Dong

et al. 2021

Agronomy

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Dollar spot is reported to be caused by multiple Clarireedia species and is a serious problem on many turfgrasses around the world. To our knowledge, the distribution of different Clarireedia species and their sensitivity profiles to fungicides remains unknown. In this study, a total of 275 isolates were characterized by ITS sequence. Amounts of 124, 59 and 75 isolates were identified as C. jacksonii, C. monteithiana and C. paspali, respectively, while each species of C. homoeocarpa and C. bennettii had only five isolates. Four and three isolates were identified as two potential new species, which remained to be further characterized. C. jacksonii and C. monteithiana were distributed worldwide, while C. paspali was restricted to China. Of the isolates with host information, 81% (93/115) and 19% (22/115) of C. jacksonii isolates were collected from C3 and C4 plants, respectively, 97% (56/58) of the C. monteithiana isolates were collected from C4 plants and all C. paspali isolates were collected from C4 plants. The coexistence of different Clarireedia species on the same C4 host type in the same locales was found in Shanghai (Paspalum vaginatum), Jiangsu (Paspalum vaginatum) and Florida (Cynodon dactylon). The study revealed that differential fungicide sensitivity patterns were observed in different species in Clarireedia for the first time. Similar differential sensitivity profiles were also found in the locales with coexistence of at least two species. The findings from this study suggest that the adjacent coexistence of different Clarireedia species and the differential fungicide sensitivity profiles of different species will complicate dollar spot disease control.

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Section: Discussionmentioning

confidence: 99%

Global Distributions of Clarireedia Species and Their In Vitro Sensitivity Profiles to Fungicides

Zhang

Dong

et al. 2021

Agronomy

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“…à pencycuron é altamente variável, mesmo entre isolados de mesmo grupo de anastomose (Roberts & Stephens, 1984;Sumner, 1987). Segundo Ueyama et al (1993), pencycuron é a única molécula ativa do fungicida na célula. A ativação metabólica e a detoxicação não explicam as variações de sensibilidade entre isolados, as quais poderiam ser decorrentes de diferenças de permeabilidade da membrana celular ou de afinidade do princípio ativo ao sítio-alvo.…”

Section: Fig 2 -Incidência Média De Estacas De Eucalipto (Eucalyptusunclassified

Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

et al. 2003

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Visando ao controle químico da queima de folhas e mela de estacas de eucalipto (Eucalyptus spp.) em viveiros florestais, avaliou-se a eficiência de 12 fungicidas em inibir in vitro o crescimento micelial de um isolado epifítico de Rhizoctonia solani AG1-IB (RH-2). Sete fungicidas que inibiram totalmente o crescimento micelial do fungo, a concentrações inferiores a 100 ppm, foram pré-selecionados: methyl-tolclophos, benomyl, pencycuron, iprodione, thiabendazol, thiram e captan. Avaliou-se, ainda, a sensibilidade (EC50 = dose provável que inibe o crescimento micelial em 50%) aos fungicidas methyl-tolclophos, benomyl, iprodione e pencycuron de mais oito isolados patogênicos ao eucalipto, que diferem entre si quanto a virulência, morfologia, grupo de anastomose, número de núcleos por célula vegetativa e padrões eletroforéticos de proteínas e isoenzimas. Embora variações nos valores de EC50 entre algumas combinações de fungicidas e isolados tenham ocorrido, todos os isolados foram sensíveis aos quatro fungicidas testados (EC50 < 11 ppm). Sob condições controladas, pulverizações com iprodione (1,5 g/l), benomyl (1 g/l), methyl-tolclophos (1,5 g/l), thiram ( 2,1 g/l), captan (2 g/l) e pencycuron (2 g/l) reduziram significativamente (alfa=5%) a incidência de folhas lesionadas por R. solani AG1, em brotações de mudas envasadas. Associadas à poda de limpeza, pulverizações de brotações de eucalipto em jardim clonal (no campo) com iprodione (1 g/l) ou com mistura de benomyl (0,5 g/l) + captan (1 g/l), alternada com mistura de benomyl (0,5 g/l) + thiram (1 g/l), reduziram a incidência da mela de estacas na casa de vegetação (alfa=5%).

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“…2 Furthermore, with a immunofluorescence staining method, Ueyama et al found that the application of pencycuron caused remarkable changes of microtubules in hyphal tips of R. solani. 3 They suggested that pencycuron might disrupt microtubule or interfere with its formation in cytoskeletal fiber of hyphal tips of R. solani, while carbendazim inhibited the polymerization of tubulins to microtubules that played an important role in cell division. 4 The difference of action site between pencycuron and carbendazim can be explained by their lipophilicity; pencycuron appeared to hardly get into the cells due to its high lopophilicity, being trapped by cell membranes.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pencycuron on Fluidity of Lipid Membranes of <i>Rhizoctonia solani</i>

興泰

勇

1996

J. Pestic. Sci.

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Pencycuron exerts a specific inhibitory activity on Rhizoctonia solani isolates even in the same anastomosis group, AG4. The sensitivity of AG4 isolates to pencycuron was negatively correlated with the mycelial growth at high temperature (30C).Based on such observation and high lipophilicity of pencycuron, the influence of pencycuron on the fluidity of lipid membranes of R. solani was examined. The composition ratio of saturated fatty acids such as palmitic acid and stearic acid in R-C (an isolate sensitive to pencycuron) was higher than that in Rh-131 (a far less-sensititve isolate). On the contrary, linoleic acid, an unsaturated fatty acid, was more abundant in Rh-131. While the fluidity of liposomes prepared with total lipids from R-C remarkably decreased by the application of pencycuron, no significant diminution of membrane fluidity was observed in liposomes from Rh-131. With artificial liposomes prepared from phosphatidylcholines commercially available, the membrane fluidity fluctuated depending on the composition of fatty acids, and the effect of pencycuron on the membrane fluidity was more significant in liposomes composed of higher ratio of saturated fatty acids. It was also found that 14C -pencycuron was bound 3 times more by liposomes that resembled R-C membrane in composition of fatty acids than those mimicked the membranes of Rh-131. From the results obtained, it is suggested that the binding of pencycuron is closely related with the composition of lipid membranes, and the binding of pencycuron to the membrane causes the decrease of membrane fluidity in sensitive isolates of R. solani.

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Metabolism of the Phenylurea Fungicide, Pencycuron, in Sensitive and Tolerant Strains of <i>Rhizoctonia solani</i>

Cited by 12 publications

References 3 publications

Global Distributions of Clarireedia Species and Their In Vitro Sensitivity Profiles to Fungicides

Global Distributions of Clarireedia Species and Their In Vitro Sensitivity Profiles to Fungicides

Controle químico da queima de folhas e da mela de estacas de eucalipto, causadas por Rhizoctonia spp.

Effect of Pencycuron on Fluidity of Lipid Membranes of <i>Rhizoctonia solani</i>

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