Abstract
To determine the species of Rhizoctonia on bean and soybean plants grown in Samsun (Turkey), field surveys were performed at 104 locations during 2001 and 2002. Rhizoctonia spp. were obtained from isolations from the necrotic lesions on the hypocotyl and rhizosphere soils. Species were identified according to Ogoshi (3) on the basis of hyphal and colony morphology and anastomosis reaction with known tester isolates (provided by M. Hyakumachi, Gifu University, Japan). Fifty Rhizoctonia spp. isolates obtained from these locations were identified as Rhizoctonia zeae (teleomorph Waitea circinata var. zeae). Nine of the 27 bean isolates and 8 of the 23 soybean isolates were recovered from plant tissues. These isolates had optimum temperature (32°C) for growth. Colonies were orange when young, becoming salmon colored with age. Sclerotia formed both on the agar surface or submerged in the medium. Superficial sclerotia were more uniform and nearly spherical, mostly 0.2 to 0.5 mm in diameter, and they were first orange and then turned brown. Pathogenicity was tested with three R. zeae isolates grown on sterile oat seeds at 25°C for 10 days. Bean and soybean seedlings grown in 1-liter plastic pots containing sterile potting mix (field soil/composted manure/sand 2:2:1 [v/v]) at true-leaf stage were inoculated by placing five infested oat seeds adjacent to the roots. Sterile oat seeds were used for controls. After 3 to 4 weeks of incubation at 17 to 25°C in a glasshouse, roots of the plants were cleaned with tap water and evaluated for disease severity. Four replicate pots were used for each isolate/plant combination. All isolates produced superficial brown lesions on roots and hypocotyls similar to those observed on plants used for isolations and root growth declined. R. zeae was reisolated from the lesions on all bean and soybean plants used for the pathogenicity test. While R. zeae was previously reported from Johnsongrass roots (1) and corn kernels (2), to our knowledge, this is the first report of R. zeae isolated from bean and soybean plants and rhizosphere soils in Turkey. References: (1) E. Demirci, and C. Eken. Plant Dis. 83:200, 1999. (2) E. Demirci and S. Kordali. Plant Dis. 83:879, 1999. (3) A. Ogoshi. Rev. Plant. Prot. Res. 8:93, 1975.
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Claims 7
Claim · model-written summary
Rhizoctonia zeae was identified among isolates from bean and soybean sites in Turkey.
- Taxon
- Bean and Soybeant0
- Interactor
- Rhizoctonia zeaeWaitea zeaee0pathogen
- Outcome
- Rhizoctonia spp. isolates obtained from these locations were identified as Rhizoctonia zeaee0
- Value
- Fiftye0
Verbatim
e0“Fifty Rhizoctonia spp. isolates obtained from these locations were identified as Rhizoctonia zeae”
t0“Bean and Soybean”
Claim · model-written summary
Nine of 27 bean isolates were recovered from plant tissue.
Verbatim
e0“Nine of the 27 bean isolates and 8 of the 23 soybean isolates were recovered from plant tissues”
Claim · model-written summary
Eight of 23 soybean isolates were recovered from plant tissue.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- plant tissuese0
- Outcome
- soybean isolatese0
- Value
- 8 of the 23e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine of the 27 bean isolates and 8 of the 23 soybean isolates were recovered from plant tissues”
Claim · model-written summary
The isolates produced brown root and hypocotyl lesions in bean.
- Taxon
- Beane1
- Treatment
- five infested oat seedse1
- Interactor
- isolatese0pathogen
- Outcome
- superficial brown lesions on roots and hypocotylse0
- Comparator
- Sterile oat seedse2
Not reportedDirection
Verbatim
e0“All isolates produced superficial brown lesions on roots and hypocotyls similar to those observed on plants used for isolations and root growth declined”
e1“Bean and soybean seedlings grown in 1-liter plastic pots containing sterile potting mix (field soil/composted manure/sand 2:2:1 [v/v]) at true-leaf stage were inoculated by placing five infested oat seeds adjacent to the roots.”
e2“Sterile oat seeds were used for controls.”
Claim · model-written summary
Root growth declined in inoculated bean and soybean plants.
Verbatim
e0“root growth declined”
e1“Bean and soybean seedlings grown in 1-liter plastic pots containing sterile potting mix (field soil/composted manure/sand 2:2:1 [v/v]) at true-leaf stage were inoculated by placing five infested oat seeds adjacent to the roots.”
e2“Sterile oat seeds were used for controls.”
Claim · model-written summary
Rhizoctonia zeae was reisolated from lesions of all inoculated bean and soybean plants.
- Taxon
- bean and soybeane0
- Interactor
- R. zeaeWaitea zeaee0pathogen
- Outcome
- R. zeae was reisolated from the lesionse0
Verbatim
e0“R. zeae was reisolated from the lesions on all bean and soybean plants used for the pathogenicity test.”
Claim · model-written summary
This was the first report of Rhizoctonia zeae from bean and soybean plants and rhizosphere soils in Turkey.
- Taxon
- bean and soybeane0
- Interactor
- R. zeaeWaitea zeaee0pathogen
- Outcome
- first report of R. zeae isolated from bean and soybean plants and rhizosphere soilse0
- Setting
- Turkeye0
Verbatim
e0“this is the first report of R. zeae isolated from bean and soybean plants and rhizosphere soils in Turkey”
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