Characterization and Taxonomic Placement of Rhizoctonia-like Endophytes from Orchid Roots

Shan, X. C.; Liew, E. C. Y.; Weatherhead, M. A.; Hodgkiss, I. J.

doi:10.2307/3761799

Cited by 30 publications

(43 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As diferenças nas dimensões das células monilioides, tanto na largura (LCM) quanto no comprimento (CCM) (Quadro 2), confirmaram as diferenças observadas no aspecto da colônia e na morfologia das células monilioides. As características qualitativas da colônia, o diâmetro da hifa vegetativa e a morfologia e a dimensão das células monilioides são importantes na identificação dos isolados de fungos rizoctonioides em nível de gênero e de espécie (Currah & Zelmer, 1992;Zelmer & Currah, 1995;Currah & Zelmer, 1997;Shan et al, 2002;Pereira et al, 2003), entretanto a identificação em nível de espécie é mais segura quando subsidiada pela avaliação de características moleculares, tais como sequência da região ITS (internal transcribed spacer) do rDNA ou da região mtLSU (mitochondrial large subunit) (Taylor & Bruns, 1999;Taylor et al, 2002).…”

Section: Resultsunclassified

Diversidade de fungos micorrízicos Epulorhiza spp. isolados de Epidendrum secundum (Orchidaceae)

Pereira

Costa³

et al. 2009

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

RESUMOFungos micorrízicos rizoctonioides Epulorhiza spp. têm sido isolados de orquídeas do gênero Epidendrum e vêm sendo utilizados na germinação simbiótica das sementes de orquídeas. Epidendrum secundum é uma orquídea largamente distribuída em campos de altitude do Parque Estadual da Serra do Brigadeiro (PESB), Minas Gerais, e pouco se sabe sobre a associação micorrízica dessa espécie nesse parque. O objetivo deste trabalho foi avaliar a diversidade morfológica dos fungos micorrízicos rizoctonioides isolados de quatro populações de E. secundum em três regiões de um campo de altitude localizado na subserra Totem Deitado, PESB. Vinte e seis isolados fúngicos foram obtidos, todos pertencentes ao gênero Epulorhiza. As características morfológicas qualitativas e quantitativas avaliadas revelaram, de modo geral, baixa variabilidade entre os isolados obtidos de uma mesma população e de populações localizadas na mesma região, porém grande variabilidade foi observada entre os isolados obtidos das populações de diferentes regiões. Com base nessas características morfológicas, os isolados foram divididos em quatro grupos: o primeiro constituído pelos fungos obtidos das populações I e II da região A, o segundo pelos fungos da população III da região B, o terceiro pelo isolado M61 da população II da região A, e o quarto pelo único isolado obtido na população IV da região C. A variabilidade morfológica observada é um indicativo da diversidade dos fungos Epulorhiza spp. associados a E. secundum no PESB.Termos de indexação: biodiversidade, conservação, fungos rizoctonioides, orquídea, simbiose.

show abstract

Section: Resultsunclassified

Diversidade de fungos micorrízicos Epulorhiza spp. isolados de Epidendrum secundum (Orchidaceae)

Pereira

Costa³

et al. 2009

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…On the other hand, studies based on the AFLP technique, scarcely employed in Rhizoctonia, were based on several aspects related to factors and genes involved in sexual compatibility mechanisms of R. solani (Julián et al, 1999) or investigating genetic diversity of some R. solani AG (Ceresini et al, 2002). Sequencing of ribosomal DNA has been widely employed in the complex during recent years, to reconstruct phylogenetic relationships between the different organisms of the form genus (Boysen et al, 1996;Kuninaga et al, 1997;Roberts, 1999;Salazar et al, 1999Salazar et al, , 2000González et al, 2001González et al, , 2002Pope and Carter, 2001;Shan et al, 2002) or less frequently other regions such as beta-tubuline (González et al, 2003). In the future, molecular approaches should include the sequencing of a broader range of DNA regions (e.g.…”

Section: Molecular Approaches To Study the Form Genusmentioning

confidence: 99%

Review. Biology and systematics of the form genus Rhizoctonia

García¹,

Onco

Susan

2006

Span. j. agric. res.

206

View full text Add to dashboard Cite

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 ...

show abstract

“…including colony size, colony growth, colour and sclerotia formation (ring at periphery, peripheral or scattered) and texture (smooth or rough). Shan et al (2002) studied cultural morphology and variation, which was found among different isolates including colony colour, growth rate, shape and colony appearance. Moni et al (2015) observed significant variation among different isolates of Rhizoctonia sp.…”

Section: Resultsmentioning

confidence: 99%

Mycelial growth inhibition of Rhizoctonia by indigenous medicinal plant extract

Sifat

Monjil

2017

Progress. Agric.

View full text Add to dashboard Cite

Pure cultures of four different isolates were established from the infected rice sheath collected different areas of Mymensingh District on the basis of different morphological characteristics including shape, colour (upper side and reverse side), sclerotial shape, sclerotial colour and compactness. The efficacy of six plant extracts viz. Garlic (Allium sativum), Neem (Azadirachta indica), Shetodron (Leucas aspera), Mahogoni leaf (Swietenia mahagoni), Mahogoni seed(Swietenia mahagoni) and Bishkatali (Polygonum hydropiper) was investigated against different the four isolates of Rhizoctonia sp. The radial mycelial growth of the fungus from 2-7 days was significantly differed among the different treatments. At 4 day after culture colony diameter was reached maximum (4.00 cm) in PDA plates of non-treated control treatment. Average colony diameter of Rhizoctonia sp. from 2-7 days after culture ranged from 0 cm to 4.00 cm. The highest colony diameter (4.00 cm) was recorded in control at 4 days after culture. At 4 days after culture, highest percent inhibition of radial mycelial growth over contril was found for Isolate 1 by Garlic (97.50%), Neem (96.75%), and Biskatali (94.25%); for Isolate 2 by Bishkatali (93.25%); for Isolate 3 by Bishkatali (95.75%), Mahogoni seed (85.75%) and Garlic (85.00%), and for Isolate 4 by Bishkatali (95.25%) and Shetodron (89.25%). Among the plant extracts, Bishkatali was highly effective to suppress mycelial growth of all isolates of Rhizoctonia sp.Progressive Agriculture 28 (3): 190-197, 2017

show abstract

Characterization and Taxonomic Placement of Rhizoctonia-like Endophytes from Orchid Roots

Abstract: Y l i "), O 'LO02 I]\ Tlie Xf)cological Societ~ of .-\mcrica. L.a~vrcncc. liS 6GO4+88Yi

Cited by 30 publications

References 8 publications

Diversidade de fungos micorrízicos Epulorhiza spp. isolados de Epidendrum secundum (Orchidaceae)

Diversidade de fungos micorrízicos Epulorhiza spp. isolados de Epidendrum secundum (Orchidaceae)

Review. Biology and systematics of the form genus Rhizoctonia

Mycelial growth inhibition of Rhizoctonia by indigenous medicinal plant extract

Contact Info

Product

Resources

About