Characterization and Pathogenicity of <i>Rhizoctonia</i> spp. from Onion in Amasya, Turkey

Erper, İsmail; Karaca, Gürsel; Türkkan, Muharrem; Özkoç, İbrahim

doi:10.1111/j.1439-0434.2006.01055.x

Cited by 23 publications

(19 citation statements)

References 14 publications

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“…Alike, the most common occurrence of R. solani AG-4 isolates on cucumber, pepper and snap bean plants has also been reported from other countries by several workers (MIRMAJLESSI et al, 2012;HARATIANA et al, 2013). Colony characteristics of isolates belonging to R. solani AG-4 were found to be similar to those of other studies (SNEH et al, 1991;ERPER et al, 2006). After 3 weeks of incubation, all colonies of R. solani AG-4 became brown colour, and their sclerotia were generally grey-brown coloured at first, then became dark brown with age.…”

Section: Discussionsupporting

confidence: 78%

“…Five millimeter diameter agar discs of the isolates cut from the margins of the growing colonies were placed 1 cm apart on opposite sides of the coverslips on WA. After 24-48 h incubation at 25°C, hyphal anastomosis was determined by transferring the coverslip onto a microscope slide and staining with Safranin O and 3% KOH using the Olympus CX31 compound microscope at 400X magnification (ERPER et al, 2006). All tester isolates used in this study were provided by Dr. Erkol Demirci, Karadeniz Technical University.…”

Section: Hyphal Anastomosismentioning

confidence: 99%

“…Five mm diameter agar disks from the edge of 4-day-old colonies growing on PDA at 25°C were placed in the centre of 9-cm-diameter Petri plates containing PDA, which were then incubated in the dark at seven temperatures above (ERPER et al, 2006). The radius of each colony was measured at two different points after 24 and 48 h. Radial growth rates in millimeters per day were calculated (ERPER et al, 2013).…”

Section: Radial Growth Of Isolates Of Rhizoctoniamentioning

confidence: 99%

“…Nuclei were counted in 20 hyphal cells of actively growing cultures per isolate. Besides, hyphal diameter was determined for each isolate by measuring 20 cells at right angles to the longitudinal cell wall by using the Olympus CX31 compound microscope at 400X magnification (ERPER et al, 2006).…”

Section: Determination Of the Number Of Nuclei And Hyphal Diametermentioning

confidence: 99%

“…They exist as groups whose cultural characteristics, hosts and virulence differ (ERPER et al, 2006). Rhizoctonia solani Kühn [teleomorph: Thanatephorus cucumeris (Frank) Donk] is a common soilborne fungus.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and pathogenicity of Rhizoctonia SPP. isolated from vegetable crops grown in greenhouses in Samsun province, Turkey

Erper¹,

Yildirim²

2017

Biosci. J.

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A total of one hundred and five isolates of Rhizoctonia belonging to 7 anastomosis groups (AGs) were obtained from the diseased roots and rhizosphere soils of bean, cucumber, eggplant, pepper and tomato plants grown in greenhouses in Samsun province (Black Sea region, Turkey) during the period 2011-2012. The isolates of Rhizoctonia spp. were examined for their cultural characteristics, anastomosis groups and pathogenicity. Of these, 83.8% were multinucleate Rhizoctonia solani (AG-2, AG-4, AG-5 and AG-6) and 16.2% were binucleate Rhizoctonia (AG-A, AG-E and AG-F). Sixty five of the isolates belonged to AG-4 which was the most frequent group (61.9%) in all greenhouses surveyed. Numbers of the isolates belonging to AG-2 (7.6%), AG-5 (6.7%) and AG-6 (7.6%) were 8, 7 and 8, respectively. Seventeen isolates recovered from greenhouses surveyed were identified as binucleate Rhizoctonia AG-A (1.9%), AG-E (6.7%) and AG-F (7.6%). All isolates of Rhizoctonia spp. tested for growth rates grew at temperatures of 10, 15, 20, 25 and 30°C, whereas they were completely inhibited at 5°C. The results of pathogenicity tests showed that the differences in virulence among isolates of Rhizoctonia spp. were statistically significant (P < 0.001). The tests on bean seedlings showed that the highest disease severity was caused by AG-4 isolates. The disease severity index (DSI) of the R. solani AG-4 isolates ranged from 3.2 to 3.8. In addition, the isolates of three AGs belonging to binucleate Rhizoctonia spp. were generally found to be moderately virulent (DSI 2.0-2.4).

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Section: Discussionsupporting

confidence: 78%

Section: Hyphal Anastomosismentioning

confidence: 99%

Section: Radial Growth Of Isolates Of Rhizoctoniamentioning

confidence: 99%

Section: Determination Of the Number Of Nuclei And Hyphal Diametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characterization and pathogenicity of Rhizoctonia SPP. isolated from vegetable crops grown in greenhouses in Samsun province, Turkey

Erper¹,

Yildirim²

2017

Biosci. J.

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Molecular Prospecting: Advancement in Diagnosis and Control of Rhizoctonia solani Diseases in Plants

Patil

Solanki

2016

Fungal Biology

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A new Rhizoctonia sp. closely related to Waitea circinata causes a new disease of creeping bentgrass

Toda

Hayakawa²,

Mghalu

et al. 2007

J Gen Plant Pathol

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Isolates of an unidentified Rhizoctonia sp. (UR isolates) were obtained from creeping bentgrass and Kentucky bluegrass with reddish brown sheath and foliar rots. Because the UR isolates anastomosed with isolates of three varieties of Waitea circinata (var. oryzae, var. zeae, and var. circinata), colony morphology, hyphal growth rate at different temperatures, pathogenicity, sequence analysis of the internal transcribed spacers (ITS) region of ribosomal RNA genes (rDNA) were compared. The colony color of mature UR isolates was distinct from isolates of the other three varieties of W. circinata. In pathogenicity tests on creeping bentgrass, the severity of the disease caused by UR isolates was significantly higher than that caused by the three varieties of W. circinata. Sequence similarities of the rDNA-ITS region between UR isolates and between isolates within each variety were high (97-100%), but they were lower among isolates from UR and the varieties of W. circinata (88-94%). In a phylogenetic tree based on the rDNA-ITS sequences, UR isolates formed a cluster separate from each of the clusters formed by the three varieties of W. circinata. These results indicate that the UR isolates clearly differ from the three varieties of W. circinata. We therefore propose that the UR isolates be classified as new Rhizoctonia sp. that are closely related to W. circinata and that the disease on creeping bentgrass should be called Waitea reddish-brown patch disease (Sekikasshoku-hagusare-byo in Japanese).

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Characterization and Pathogenicity of Rhizoctonia spp. from Onion in Amasya, Turkey

Cited by 23 publications

References 14 publications

Characterization and pathogenicity of Rhizoctonia SPP. isolated from vegetable crops grown in greenhouses in Samsun province, Turkey

Characterization and pathogenicity of Rhizoctonia SPP. isolated from vegetable crops grown in greenhouses in Samsun province, Turkey

Molecular Prospecting: Advancement in Diagnosis and Control of Rhizoctonia solani Diseases in Plants

A new Rhizoctonia sp. closely related to Waitea circinata causes a new disease of creeping bentgrass

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