Increased growth responses induced by a nonpathogenic <i>Rhizoctonia solani</i>

Sneh, B.; Zeidan, M. S.; Ichielevich-Auster, Meira; Barash, Itzhak; Koltin, Y.

doi:10.1139/b86-313

Cited by 51 publications

(27 citation statements)

References 13 publications

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“…3). This has also been reported for isolates that are intrinsically nonpathogenic (Sneh et al, 1986). The plant growth promoting activity of R. solani isolates may be due to nutrient release, production of plant hormones or both, and R. solani has been reported to produce substances with gibberellin-like activity (Aubé & Sackston, 1965).…”

mentioning

confidence: 57%

“…Nevertheless, they can be arranged in groups based on anastomosis, the process of hyphal fusion between isolates (Richter & Schneider, 1953;Parmeter et al, 1969). To date, 12 different anastomosis groups (AGs) are recognized (Sneh et al, 1986;Carling et al, 1994). Of these, AG-1, AG-2, AG-4, AG-6, AG-8 and AG-9 have been subdivided, based on symptoms on rice (AG-1), hyphal fusion frequency (AG-2), zymography (AG-8) or DNA base-sequence homology comparison (AG-4, AG-6 and AG-9).…”

Section: Introductionmentioning

confidence: 99%

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In vitro analysis of host plant specificity in Rhizoctonia solani

et al. 1997

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Rhizoctonia solani is a plant pathogenic fungus with a wide host range. Host plant specificity within R. solani was analysed on seedlings grown aseptically on agar, which allowed continuous observation of both the fungus and the whole plant without disturbing the interaction. Symptom development on cauliflower, Arabidopsis, eggplant, tomato and potato by 32 R. solani isolates, belonging to six different anastomosis groups (AGs), was studied. Host plant specificity of isolates, as analysed by similarity clustering, was similar to AG-related host plant specificity as observed in the field, with AG3 isolates (except two avirulent strains) separating from the other isolates. Two R. solani isolates with a reciprocal pathogenicity on cauliflower and tomato were selected for further studies. These showed that in the pathogenic combination, R. solani isolates grew over the plant, adhered and formed infection structures, while in the nonpathogenic combination isolates grew over the plant, but neither adhesion nor the formation of infection structures occurred. From these data, it was concluded that host plant specificity is mediated in the early steps of the infection process.

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confidence: 57%

Section: Introductionmentioning

confidence: 99%

In vitro analysis of host plant specificity in Rhizoctonia solani

et al. 1997

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“…Sneh et al (1986) reported these effects on the growth of radish, carrot, lettuce, cotton and wheat seedlings and Harris et al (1993Harris et al ( , 1994 found similar phenomena in pepper and some ornamental species. Finally, Sneh et al (1986) and Bandy and Tavantzis (1990) observed in potato seedlings inoculated with hypovirulent isolates of R. solani AG 3, that biomass rates were increased and early tuberization and flowering occurred compared to untreated controls. These effects on potato plants were also reported in Spain by González et al (2000).…”

Section: Pathology and Hypovirulence In The Complexmentioning

confidence: 77%

Review. Biology and systematics of the form genus Rhizoctonia

García¹,

Onco

Susan

2006

Span. j. agric. res.

205

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Members of the form genus Rhizoctonia D.C. are considered as a complex mixture of filamentous fungi, having in common the possession of a non-spored imperfect state, usually referred to as the Rhizoctonia anamorph. The group includes several of the most devastating crop pathogens like Thanatephorus cucumeris (Frank) Donk (anamorph = Rhizoctonia solani Kühn), the majority of orchid mycorrhizal symbionts (mainly belonging to genus Ceratobasidium D.P. Rogers) and a collection of saprotrophic organisms of different systematic placement. The Rhizoctonia anamorph is characterized by several common features present among members of the entire Rhizoctonia species complex. Taxa from the group have been rearranged into several groups of higher fungi, including both Ascomycota and Basidiomycota, and split into several genera, employing criteria such as the analysis and ultrastructural comparison of septal apparatus. Until very recently, classification for some of the groups within the complex has been exclusively based on criteria such as hyphal anastomosis, since other types of diagnostic features are usually scarce in these fungi. Phytopathological studies in the complex have represented the major contingent of contributions in the group, especially in the case of R. solani. Some members of the complex have been reported to be protective isolates against pathogenic members of Rhizoctonia and some other fungal pathogens. This review focuses on the knowledge of several aspects of the species of Rhizcotonia s. lato, such as its current taxonomic placement, the biology and systematics of some groups of the complex, and a revision of the methodologies employed in studying it.Additional key words: Basidiomycetes, biocontrol, Ceratobasidiaceae, Ceratobasidium, fungal diseases, methodology, taxonomy, Thanatephorus. Resumen Biología y Sistemática del género forma RhizoctoniaLos miembros del género forma Rhizoctonia D.C. son considerados como un complejo de hongos filamentosos, presentando en común una fase asexual no productora de esporas, denominada anamorfo tipo Rhizoctonia. El grupo incluye algunos importantes patógenos como Thanatephorus cucumeris (Frank) Donk (anamorfo=Rhizoctonia solani Kühn), la mayoría de especies micorrícicas de orquídeas (principalmente del género Ceratobasidium D.P. Rogers), y algunos taxones de posición taxonómica variada. El anamorfo tipo Rhizoctonia es definido por una serie de características, presentes y comunes en todos los taxones del complejo. Los taxones del grupo han sido distribuidos entre varios grupos de hongos, incluyendo Ascomicetes y Basidiomicetes, y reubicados en varios géneros de ambas clases, empleando criterios de clasificación tales como el análisis y comparación de la ultraestructura del aparato septal. Habitualmente, la clasificación en algunos de los grupos del complejo ha estado basada en la aplicación de criterios tales como la anastomosis hifal, debido a que en este tipo de hongos es escasa la presencia de un número aceptable de caracteres diagnósticos. Los trabajos ...

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“…Porém, como método de inoculação, as sementes foram cobertas com substrato infestado com micélio de R. solani AG1-IB -isolado RH 12 (Silveira et al, 2000). O isolado fúngico foi mantido desidratado em flocos de aveia (Sneh et al, 1986). Para produção do inóculo, o fungo foi repicado para meio de batata-dextrose-ágar (BDA) e incubado por três dias a 25ºC no escuro.…”

Section: Solaniunclassified

Tratamento químico de sementes de mamão visando ao controle de Rhizoctonia solani

Campos

Silveira

Silva

et al. 2009

Trop. plant pathol.

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Parte da Dissertação de Mestrado da primeira autora. Universidade Estadual do Norte Fluminense. Campos dos Goytacazes RJ. 2007. RESUMOAvaliou-se a eficiência do tratamento de sementes de mamoeiro com fungicidas no controle de Rhizoctonia solani. Foram realizados dois experimentos nos quais as sementes foram tratadas com fungicidas nas seguintes doses (g i.a. kg -1 de sementes): triadimenol (0,5 e 1,0), pencycuron (1,0 e 2,0), thiabendazole (5,0 e 10,0), fludioxonil (0,25 e 0,50), difeconazole (1,0 e 2,0), captan (5,0), tolylfluanid (2,5), captan + tolylfluanid (5,0+2,5). Na testemunha, as sementes foram tratadas apenas com água. Em laboratório, avaliou-se o vigor (%) e a germinação (%) das sementes. Em casa-de-vegetação, efetuou-se o semeio das sementes tratadas e não-tratadas em substrato infestado com micélio de R..solani AG1-IB. Sementes não tratadas foram plantadas em substrato infestado e não infestado (testemunhas). Não se observaram sintomas de toxidez nas plântulas cujas sementes foram tratadas com os fungicidas testados. Em casa-de-vegetação, a exceção de difeconazole, todos os demais fungicidas reduziram eficientemente a morte de plântulas em pré-emergência e apresentaram elevada emergência de plântulas (%), igualando-se a testemunha em substrato não infestado, com destaque para a mistura tolylfluanid + captan, que diferiu estatisticamente da testemunha em substrato infestado. Já, quanto ao percentual de plântulas com tombamento em pós-emergência, controle satisfatório foi obtido somente quando as sementes foram plantadas em substrato não infestado. Palavras-chave: Carica papaya, damping off, fungicidas. ABSTRACT Chemical treatment of papaya seeds to control Rhizoctonia solaniThe efficiency of fungicides applied on papaya seeds to control Rhizoctonia solani was evaluated in two experiments. Papaya seeds were treated with fungicides (grams of active ingredient kg -1 of seeds): triadimenol (0,5 and 1,0), pencycuron (1.0 and 2.0), thiabendazole (5,0 and 10,0), fludioxonil (0,25 and 0,50), difeconazole (1.0 and 2.0), captan (5.0), tolylfluanid (2.5) and captan + tolylfluanid (5.0 + 2.5) and controls (without fungicides). The vigor (seed germination percentage at the first count) and germination (%) of the seeds were evaluated in laboratory. In greenhouse, seeds were sowed in substrate infested with fungus mycelia, and in the controls, untreated seeds were sowed in infested and uninfested substrate. Seeds without chemical treatment were planted in infested and uninfested substrate as the controls. Toxicity symptoms on the seedlings were not observed for all treatments. Except for difeconazole, all products were efficient in controlling the death of seedlings in pre emergence and increased the emergence of plants in both experiments in greenhouse conditions, but satisfactory post-emergence damping-off control was achieved only by use of uninfested substrate.

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Increased growth responses induced by a nonpathogenic Rhizoctonia solani

Cited by 51 publications

References 13 publications

In vitro analysis of host plant specificity in Rhizoctonia solani

In vitro analysis of host plant specificity in Rhizoctonia solani

Review. Biology and systematics of the form genus Rhizoctonia

Tratamento químico de sementes de mamão visando ao controle de Rhizoctonia solani

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