Ultrastruktur von Weizenkoleoptilzellen nach Infektion mit Cercosporella berpotnchoides

Fehrmann, H.; Mendgen, Kurt

doi:10.1111/j.1439-0434.1975.tb03537.x

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…Helgardia herpotrichoides (Fron) Crous & W. Gams with an Oculimacula teleomorph (Helotiales, Crous et al 2003) and Pleurovularia polliniae (Henn.) R. Kirschner & U. Braun with unknown teleomorph affinities grow intracellularly (Fehrmann andMendgen 1975, Kirschner et al 2002). Appressoria playing an important role in mediating the host-parasite interface (Emmett and Parbery 1975) often have a characteristic morphology that can be used to define genera and distinguish species of Ascomycota, for example in Erysiphales (Braun 1987), Meliolales (Hansford 1961), Phyllachorales (Parbery 1963), and ascomycetous anamorphs such as Colletotrichum (Sutton 1980) and Mycoleptodiscus (Alcorn 1994).…”

Section: Introductionmentioning

confidence: 95%

CercosporellaandRamularia

Kirschner

2009

Mycologia

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Cercosporella and Ramularia (hyphomycetous anamorphs with relationship to Mycosphaerellaceae, Ascomycota) are difficult to distinguish based on light microscopic characteristics of conidiophores and conidia. Although both genera have been known for more than 120 y, new morphological characteristics were found by "simple" light and scanning electron microscopy now allowing an unambiguous differentiation between both genera. Newly discovered morphological characteristics of interaction structures and ultrastructure of conidiogenous loci are congruent with LSU rDNA sequence analysis of C. virgaureae and Ramularia species. DNA sequences of the type species of both genera, C. virgaureae and R. pusilla, were generated. For the first time a complex cup-shaped appressorium is reported for a member of plant pathogenic cercosporoid hyphomycetes, based on light, scanning and transmission electron microscopy. The appressorium of C. virgaureae is formed by strongly branched hyphae radiating from a supporting intercellular hypha and remaining closely attached to each other. With its concave side the appressorium adheres to a cell of the leaf mesophyll. This structure is significant in comparison with morphologically unspecific intercellular hyphae known in other cercosporoid hyphomycetes. Scanning electron microscopy of conidiogenous loci also provide additional characteristics for distinguishing Cercosporella and Ramularia. Conidiogenous loci are smooth in Cercosporella but similar to the Cladosporium-type (consisting of a circular rim and a central dome) in Ramrnularia.

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Section: Introductionmentioning

confidence: 95%

CercosporellaandRamularia

Kirschner

2009

Mycologia

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“…Leur volume est sensiblement doublé. Comme l'ont indiqué D EFOSSE & DEKEGEL (1974), RASSEL (1974), FEHRMANN & MENDGEN (1975), on observe également des épaississements très importants des parois pectocellulosiques. L'épaisseur de celle-ci, notamment au niveau de l'épiderme, peut décupler et atteindre jusqu'à 10 fJom par endroits (pl.…”

Section: Résultatsunclassified

“…La croissance intracellulaire de C. herpotrichoides, déjà étudiée dans le cas de lignées de blé sensibles (DE F OSS E & DEKEGEL, 1974 ;RASSEL, 1974 ;FEHRMANN & MENDGEN, 1975), apparaît semblable pour les lignées résistantes. Les hyphes s'accolent à la paroi pectocellulosique et forment un prolongement mince qui s'insère au travers des éléments pariétaux (pl.…”

Section: Modalité De Pénétration Du Champignonunclassified

“…Les composés osmiophiles formés sont probablement des tannins ou des produits d'oxydases non spécifiques, comme l'ont suggéré FEHRMANN & MENDGEN (1975). Leur accumulation, plus importante dans les cellules infectées des lignées résistantes, pourrait inhiber le développement des hyphes et les placer dans un milieu totalement défavorable.…”

Section: Modalité De Pénétration Du Champignonunclassified

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Nature des interactions hôte-parasite lors de l'infection par Cercosporella herpotrichoides Fron de diverses lignées de Triticinées sensibles et résistantes. I. - Etude ultrastructurale des tissus au cours de la pathogenèse

Guillot‐Salomon¹,

Doussinault²,

Besombes³

et al. 1981

Agronomie

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“…Correlation has been confirmed between the levels of CWDE activity and the degree of pathogenesis ( Jia et al, 2009 ; Zhang, Bruton & Biles, 2014 ; Zhou et al, 2016 ; Gawade et al, 2017 ). It has been demonstrated histochemically and histopathologically that the disintegration and change of plant cell walls is due to CWDEs ( Weinhold & Motta, 1973 ; Fehrmann & Mendgen, 1975 ; Wanjiru, Kang & Buchenauer, 2002 ; Kang et al, 2007 ).…”

Section: Introductionmentioning

confidence: 99%

Cell-wall-degrading enzymes produced in vitro and in vivo byRhizoctonia solani, the causative fungus of peanut sheath blight

Xue¹,

Zhou²,

Li³

et al. 2018

PeerJ

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Rhizoctonia solani causes the disease peanut sheath blight, involving symptoms of maceration and necrosis of infected tissue, mainly caused by cell-wall-degrading enzymes (CWDEs). This study investigated the production of CWDEs including polygalacturonase (PG), polymethyl-galacturonase (PMG), cellulase (Cx) and β-glucosidase by R. solani in vitro (in liquid culture) and in vivo (in peanut plants). Significant PG, PMG, Cx and β-glucosidase activities were detected in infected tissues including stalk and leaves of Baisha and Silihong peanut cultivars. Extracts of healthy tissue showed little or no such activities. In shaken liquid cultures of R. solani in medium containing pectin or pectin plus carboxymethyl cellulose (CMC) as the carbon source(s), PG and PMG were notably active. Significant Cx activity was detected in cultures with CMC or pectin plus CMC as the carbon source(s). However, only a very low level of β-glucosidase activity was observed in cultures with any of the tested carbon sources. An increase of pH was recorded in decayed peanut tissues and liquid culture filtrates; the filtrate pH and fungal growth positively correlated. The fungal growth and/or pH were important factors for the production of PG, PMG and Cx in culture with pectin plus CMC as the carbon source. A single active PG isozyme with isoelectric point around 9.2 was detected in culture filtrates and in infected peanut tissues by the method of isoelectric focusing electrophoresis. The crude enzymes extracted from liquid culture of R. solani induced decay of healthy peanut leaves.

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Ultrastruktur von Weizenkoleoptilzellen nach Infektion mit Cercosporella berpotnchoides

Cited by 7 publications

References 22 publications

CercosporellaandRamularia

CercosporellaandRamularia

Nature des interactions hôte-parasite lors de l'infection par Cercosporella herpotrichoides Fron de diverses lignées de Triticinées sensibles et résistantes. I. - Etude ultrastructurale des tissus au cours de la pathogenèse

Cell-wall-degrading enzymes produced in vitro and in vivo byRhizoctonia solani, the causative fungus of peanut sheath blight

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