Infection Cushion Formation on Rice Sheaths by<i>Rhizoctonia solani</i>

Marshall, David; Rush, M. C.

doi:10.1094/phyto-70-947

Cited by 66 publications

(59 citation statements)

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“…As has been observed with R. solani, some fungi have the ability to develop different kinds of initial infection structures. lnfection structures of this fungus vary from none in which hyphae penetrate the host plant directly via stomates, although rarely (Dodman et al, 1968;Murray, 1982), to the development of lobate appressoria (Dodman et al, 1968;Flentje, 1957;Marshall and Rush, 1980;Murray, 1982), to complex dome-shaped infection cushions (Armentrout and Downer,1987;Armentrautet al, 1987) (see Fig. 6).…”

Section: Diversity Of Lnfection Structuresmentioning

confidence: 99%

Signaling for Infection Structure Formation in Fungi

Hoch

Staples

1991

The Fungal Spore and Disease Initiation in Plants and Animals

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Section: Diversity Of Lnfection Structuresmentioning

confidence: 99%

Signaling for Infection Structure Formation in Fungi

Hoch

Staples

1991

The Fungal Spore and Disease Initiation in Plants and Animals

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“…The different contributions observed for some of the OsGER4 gene family members against rice blast and sheath blight may result from tissue-specific induction of these genes rather than pathogen-specific induction, considering that both pathogens have different infection strategies with respect to tissue specificity. However, both pathogens directly penetrate the plant cuticle with distinct structures that may release general elicitors that will activate common defense responses (Marshall and Rush, 1980;Talbot, 2003).…”

mentioning

confidence: 99%

A Germin-Like Protein Gene Family Functions as a Complex Quantitative Trait Locus Conferring Broad-Spectrum Disease Resistance in Rice

et al. 2008

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Plant disease resistance governed by quantitative trait loci (QTL) is predicted to be effective against a broad spectrum of pathogens and long lasting. Use of these QTL to improve crop species, however, is hindered because the genes contributing to the trait are not known. Five disease resistance QTL that colocalized with defense response genes were accumulated by marker-aided selection to develop blast-resistant varieties. One advanced backcross line carrying the major-effect QTL on chromosome (chr) 8, which included a cluster of 12 germin-like protein (OsGLP) gene members, exhibited resistance to rice (Oryza sativa) blast disease over 14 cropping seasons. To determine if OsGLP members contribute to resistance and if the resistance was broad spectrum, a highly conserved portion of the OsGLP coding region was used as an RNA interference trigger to silence a few to all expressed chr 8 OsGLP family members. Challenge with two different fungal pathogens (causal agents of rice blast and sheath blight diseases) revealed that as more chr 8 OsGLP genes were suppressed, disease susceptibility of the plants increased. Of the 12 chr 8 OsGLPs, one clustered subfamily (OsGER4) contributed most to resistance. The similarities of sequence, gene organization, and roles in disease resistance of GLP family members in rice and other cereals, including barley (Hordeum vulgare) and wheat (Triticum aestivum), suggest that resistance contributed by the chr 8 OsGLP is a broad-spectrum, basal mechanism conserved among the Gramineae. Natural selection may have preserved a whole gene family to provide a stepwise, flexible defense response to pathogen invasion.

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“…Marshall & Rush (1980) sugeriram que uma menor formação das almofadas de infecção e o limitado desenvolvimento superficial de hifas de R. solani sobre as bainhas de arroz foram determinantes para a redução de sintomas da queima das bainhas em cultivares de arroz consideradas resistentes. O Si pode se depositar na parede celular da epiderme das folhas de arroz podendo, assim, atuar como uma barreira física que impede ou atrasa a penetração de P. oryzae (Hayasaka et al, 2008;Kim et al, 2002;Ma & Yamaji, 2006;Yoshida et al, 1962).…”

Section: Discussionunclassified

Análise microscópica da resistência do arroz à queima das bainhas mediada pelo silício

Schurt¹,

Reis²,

Araújo³

et al. 2015

Bragantia

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A queima das bainhas, causada pelo fungo Rhizoctonia solani Kühn, é uma das mais importantes e destrutivas doenças que afetam a produção de arroz no mundo. Embora o silício (Si) seja capaz de reduzir a intensidade da queima das bainhas, os mecanismos de resistência mediados por esse elemento permanecem desconhecidos. Assim, este trabalho teve como objetivo investigar a nível microscópico o efeito do Si na resistência do arroz à infecção por R. solani. Plantas de arroz das cultivares BR-Irga-409 e Labelle foram cultivadas em solução nutritiva contendo 0 ou 2 mM de Si e inoculadas no estádio de máximo perfilhamento utilizando-se pedaços de palito de dente colonizados por R. solani. Ambos cultivares supridas com Si apresentaram intensa e homogênea deposição de Si nos tecidos das bainhas colonizados por R. solani. A maior concentração de Si nas bainhas de plantas de arroz de ambas cultivares contribuiu para reduzir os sintomas da queima das bainhas. Com o auxílio da microscopia de luz e da microscopia eletrônica de varredura, observou-se menor crescimento micelial do fungo sobre as bainhas foliares das plantas de ambas cultivares que foram supridas com Si. Secções das bainhas de plantas de ambos cultivares supridas com Si exibiram intensa autofluorescência nos tecidos próximos a regiões necrosadas devido a colonização por R. solani. Em conclusão, o suprimento de Si às plantas de arroz desempenhou um papel importante na redução dos sintomas da queima das bainhas.Palavras-chave: Rhizoctonia solani, autofluorescência, microanálise de raios-X, microscopia de luz, microscopia eletrônica de varredura, nutrição mineral. Microscopic analysis of rice resistance to sheath blight mediated by siliconAbstract Sheath blight, caused by the fungus Rhizoctonia solani Kühn, is one of the most important and destructive diseases affecting rice production in the world. Although silicon (Si) is able to reduce the sheath blight intensity, the mechanisms of resistance mediated by this element remain unknown. Thus, this study aimed to investigate at the microscopical level the effect of Si on rice resistance to infection by R. solani. Rice plants from cultivars BR-Irga-409 and Labelle were grown in nutrient solution containing 0 or 2 mM of Si and inoculated at the maximum tillering stage using pieces of toothpick colonized by R. solani. Both cultivars supplied with Si showed intense and homogeneous deposition of Si in the leaf sheaths tissue colonized by R. solani. The highest Si concentration on the leaf sheaths of plants of both cultivars contributed to reduce the sheath blight symptoms. Using light microscopy and scanning electron microscopy, it was observed reduced fungal growth on the leaf sheaths of plants from both cultivars which were supplied with Si. Sections of the leaf sheaths of plants from both cultivars supplied with Si exhibited intense autofluorescence in tissues near to the necrotic areas due to R. solani colonization. In conclusion, the supply of Si to rice plants played an important role in reducing the sheath blight sym...

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Infection Cushion Formation on Rice Sheaths byRhizoctonia solani

Cited by 66 publications

References 0 publications

Signaling for Infection Structure Formation in Fungi

Signaling for Infection Structure Formation in Fungi

A Germin-Like Protein Gene Family Functions as a Complex Quantitative Trait Locus Conferring Broad-Spectrum Disease Resistance in Rice

Análise microscópica da resistência do arroz à queima das bainhas mediada pelo silício

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