Identity and pathogenicity of Rhizoctonia spp. associated with bare patch disease of cereals at a field site in Western Australia

Roberts, Frank A.; Sivasithamparam, Krishnapillai

doi:10.1007/bf01977685

Cited by 35 publications

(16 citation statements)

References 19 publications

(13 reference statements)

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“…However, some authors (i.e. Roberts and Sivasithamparam, 1986) reported that in wheat fields soil infested with R. solani, the center of disease patches was dominated by this fungus, while the populations of binucleate Rhizoctonia were distributed along the margins of these patches, suggesting that these isolates could be involved in controlling the spread of these disease patches by means of antagonistic phenomena against pathogenic R. solani strains, despite the fact that some binucleate Rhizoctonia isolates have been reported to be pathogens on wheat.…”

Section: Pathology and Hypovirulence In The Complexmentioning

confidence: 99%

Review. Biology and systematics of the form genus Rhizoctonia

García¹,

Onco

Susan

2006

Span. j. agric. res.

203

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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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Section: Pathology and Hypovirulence In The Complexmentioning

confidence: 99%

Review. Biology and systematics of the form genus Rhizoctonia

García¹,

Onco

Susan

2006

Span. j. agric. res.

203

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“…We found that ZG1-5 and ZG1-4 caused severe root rot on all genotypes tested. ZG1-5 and ZG1-4 are known to have wide host range and are among the most commonly isolated R. solani group associated with root rot/bare patch of cereals and legumes (Roberts and Sivasithamparam 1986;Sweetingham et al 1986;Neate et al 1988;Sweetingham 1990;MacNish et al 1993;Roget 1995;MacNish and Neate 1996;Schillinger and Paulitz 2006). AG8 strains are normally associated with bare-patch disease in the field and require specific soil conditions to express their pathogenicity (Gill et al 2000(Gill et al , 2001a(Gill et al , b, c, 2002.…”

Section: Discussionmentioning

confidence: 96%

Cross-pathogenicity of Rhizoctonia solani strains on pasture legumes in pasture-crop rotations

et al. 2007

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“…The patches can recur in the same field for several years, and may change shape or size from one season to the next (MacNish, 1985). Rhizoctonia solani Kuhn has been considered to be the causal agent of this disease (Roberts & Sivasithamparam, 1986;Ogoshi et ai, 1990).…”

Section: Introductionmentioning

confidence: 99%

“…The genus is divided into binucleate (BN) and multinucleate (MN) groups based on nuclear number per cell of young vegetative hyphae. Roberts & Sivasithamparam (1986) reported that the multinucleate isolates were the most pathogenic, while binucleate isolates were moderately to mildly pathogenic to cereals.…”

Section: Introductionmentioning

confidence: 99%

Association of Rhizoctonia strains with bare patch disease of wheat in Western Australia

et al. 1994

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Rhizoctonia-Wkt fungi were isolated from the roots of diseased wheat plants sampled from the centre and periphery of three bare patches, and from apparently healthy plants from outside the patches. Of the isolates recovered, 81 % were multinucleate and belonged to R. solani anastomosis group 8, and pectic zymogram group 1-1; the remaining isolates were binucleate Rhizoctonia spp. The multinucleate isolates could be grouped into highly virulent, intermediately virulent, and weakly virulent types. The binucleate isolates were all non-pathogenic. The multinucleate isolates were obtained at a significantly higher frequency from plants within the patches compared with outside the patches, and with the exception of a single isolate, the highly virulent isolates were not found outside the patches. The weakly virulent isolates were present at much lower frequencies than the highly virulent and intermediately virulent forms within the patches. The frequency of occurrence of binucleate isolates did not vary significantly among the locations sampled. None of the multinucleate isolates contained plasmids. Some of the isolates contained a prominent single dsRNA species and one or more minor dsRNA species. The distribution of these dsRNAs was not correlated with pathogenicity.

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Identity and pathogenicity of Rhizoctonia spp. associated with bare patch disease of cereals at a field site in Western Australia

Cited by 35 publications

References 19 publications

Review. Biology and systematics of the form genus Rhizoctonia

Review. Biology and systematics of the form genus Rhizoctonia

Cross-pathogenicity of Rhizoctonia solani strains on pasture legumes in pasture-crop rotations

Association of Rhizoctonia strains with bare patch disease of wheat in Western Australia

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