Characterisation of Rhizoctonia solani Anastomosis Groups Causing Bottom Rot in Field-Grown Lettuce in Germany

Grosch, Rita; Schneider, Johannes; Kofoet, A.

doi:10.1023/b:ejpp.0000010137.69498.10

Cited by 51 publications

(52 citation statements)

References 19 publications

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“…Similar to previously reported field observations [3], soil type-dependent differences in severity of bottom rot disease in lettuce, induced by inoculation with R. solani AG1-IB (predominant in field-grown lettuce in Germany [28]), were confirmed in the present minirhizotron study. The experiment was conducted under controlled conditions on three different soils (DS: diluvial sand, pH 6.1; AL: alluvial loam, pH 6.7; LL: loess loam, pH 7.1) with the same cropping history during the last 10 years.…”

Section: Plant Pathogen Interactionssupporting

confidence: 92%

“…The more severe disease symptoms in the minirhizotron study may be attributed to higher rooting densities in the limited soil volume of the minirhizotrons and due to shorter spatial distances between the pathogen and the host plant in comparison to field conditions with larger soil volume. Moreover, the constant temperature conditions in the growth chamber (23-25 • C) in the optimum range for hyphal growth of R. solani AG1-IB [28] could further promote the infection process, particularly on the DS soil with the weakest plant development even in the non-inoculated control (Table 1). Accordingly, Schreiter et al [3] reported a certain background infection potential for bottom rot disease in all investigated soils, even without artificial inoculation with R. solani AG1-IB, with the lowest disease severity on LL soil, in comparison to disease severity for plants grown on DS and AL soil.…”

Section: Plant Pathogen Interactionsmentioning

confidence: 99%

“…Rhizoctonia solani infection sites are usually located at the root-shoot junction and at the lower leaves with direct soil contact [28,29]. Thus, release of antifungal root exudates, even five weeks after inoculation with the pathogen, may indicate a systemic response of lettuce to R. solani infection.…”

Section: Plant Pathogen Interactionsmentioning

confidence: 99%

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Rhizoctonia solani and Bacterial Inoculants Stimulate Root Exudation of Antifungal Compounds in Lettuce in a Soil-Type Specific Manner

et al. 2017

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Previous studies conducted on a unique field site comprising three contrasting soils (diluvial sand DS, alluvial loam AL, loess loam LL) under identical cropping history, demonstrated soil type-dependent differences in biocontrol efficiency against Rhizoctonia solani-induced bottom rot disease in lettuce by two bacterial inoculants (Pseudomonas jessenii RU47 and Serratia plymuthica 3Re-4-18). Disease severity declined in the order DS > AL > LL. These differences were confirmed under controlled conditions, using the same soils in minirhizotron experiments. Gas chromatography-mass spectrometry (GC-MS) profiling of rhizosphere soil solutions revealed benzoic and lauric acids as antifungal compounds; previously identified in root exudates of lettuce. Pathogen inoculation and pre-inoculation with bacterial inoculants significantly increased the release of antifungal root exudates in a soil type-specific manner; with the highest absolute levels detected on the least-affected LL soil. Soil type-dependent differences were also recorded for the biocontrol effects of the two bacterial inoculants; showing the highest efficiency after double-inoculation on the AL soil. However, this was associated with a reduction of shoot growth and root hair development and a limited micronutrient status of the host plants. Obviously, disease severity and the expression of biocontrol effects are influenced by soil properties with potential impact on reproducibility of practical applications.

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Section: Plant Pathogen Interactionssupporting

confidence: 92%

Section: Plant Pathogen Interactionsmentioning

confidence: 99%

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Rhizoctonia solani and Bacterial Inoculants Stimulate Root Exudation of Antifungal Compounds in Lettuce in a Soil-Type Specific Manner

et al. 2017

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“…It has been genetically confirmed in recent years by the use of DNAbased molecular methods. One of the most useful tool is the analysis of sequences from rDNA ITS (Grosch et al 2004(Grosch et al , 2007. This has been used for identification of anastomosis groups.…”

Section: Introductionmentioning

confidence: 99%

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Mora-Umaña¹,

Barboza²,

Alvarado³

et al. 2013

Trop. plant pathol.

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Web blight is one of the main diseases that affects bean (Phaseolus vulgaris) cultivation. It infects diverse organs at any growth stage of the plant and can be present at different altitudes in a humid tropical climate. The causal agent of this disease is Thanatephorus cucumeris in its sexual stage and Rhizoctonia solani in the anamorph. The objective of this investigation was to characterize molecular isolates of R. solani obtained from bean plants from diverse production regions in Costa Rica and determine their virulence. Fifty-one samples of symptomatic bean plants were collected using a global positioning system. Virulence was evaluated using the detached leaf technique. Isolates were identified using AG 1-IA, AG 1-IB, AG 1-IC, AG 1-ID, AG 2-2, AG 2-2IIIB, AG 2-2IV and AG 4 molecular markers. ITS sequences were obtained and analyzed with BLAST, aligned, and a phylogenetic tree was constructed. A high degree of virulence and genetic variability between isolates was identified and the anastomosis subgroups of isolates were independent of their geographical origin.

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“…O'Neill et al (1977) showed that R. solani AG-I spreads through the soybean canopy by mycelial growth from infected to adjacent healthy leaves. In Germany, R. solani AG-1 (IB) is the causal agent of bottom rot on lettuce (Grosch et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Leaf Rot and Leaf Ring Spot Caused by Rhizoctonia solani in Chinese Cabbage

Shim¹,

Kim²,

Kim³

et al. 2013

Research in Plant Disease

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This study was conducted to determine the occurrence of leaf rot and leaf ring spot, caused by Rhizoctonia solani in Chinese cabbage under seedling nursery and cultivation greenhouses. Symptoms of leaf rot and leaf ring spot were found in three Chinese cabbage cultivars, Brassica campestris subsp. pekinensis, 'Ryeokgwang', 'Daetong', and 'CR mat'. In Hwacheon, the disease incidence was 73.8% in the seedling stage of the Chinese cabbage. In Icheon, the symptoms were observed on the upper leaves of the Chinese cabbage cultivar, 'Norangmini' with 20.5% of disease incidence. The symptoms appeared as primary lesions consisting of small, circular necrotic ring spots with gray color, 1.4−3.0 mm in diameter, accompanied by secondary rot lesions with large irregular borders of leaves. The color of mycelial mat of 20 isolates was dark brown and light brown. The average hyphal diameter of all the isolates was within 5.01−11.12 µm. Among the 20 strains isolated from Chinese cabbage, 16 isolates and four isolates anastomosed with the AG-1 (IB) and AG-1 (IC), respectively. Twenty isolates tested were only virulent on foliage parts of Chinese cabbage leaves but were avirulent on stem parts of the plants. Based on the mycological characteristics and pathogenicity test on host plants, the fungus was identified as Rhizoctonia solani.

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Characterisation of Rhizoctonia solani Anastomosis Groups Causing Bottom Rot in Field-Grown Lettuce in Germany

Cited by 51 publications

References 19 publications

Rhizoctonia solani and Bacterial Inoculants Stimulate Root Exudation of Antifungal Compounds in Lettuce in a Soil-Type Specific Manner

Rhizoctonia solani and Bacterial Inoculants Stimulate Root Exudation of Antifungal Compounds in Lettuce in a Soil-Type Specific Manner

Virulence and molecular characterization of Costa Rican isolates of Rhizoctonia solani from common bean

Leaf Rot and Leaf Ring Spot Caused by Rhizoctonia solani in Chinese Cabbage

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