Journal of General Plant Pathology (2005) 71, 333-339

Hiromitsu Furuya, Keisuke Tubaki, Tsutomu Matsumoto, Shin-ichi Fuji and Hideki Naito (2005)
Deleterious effects of fungi isolated from paddy soils on seminal root of rice
Journal of General Plant Pathology 71 (5), 333-339
Abstract: Soil samples were collected from rice paddies at 22 locations in northeastern Honshu, Japan. In 20 of the samples, seedling growth of rice was improved by soil pasteurization (aerated steaming at 60°C for 30 min), although no typical disease symptoms were observed in the seedlings grown in the untreated soil samples. In most locations, rice seedlings grew better in a potting medium containing root material from plants grown in the pasteurized portion of a soil sample than in a medium with root material from plants grown in the unpasteurized portion of the same sample. The results suggest that microorganisms that restrained rice seedling growth may be common in the soils of rice paddies. Approximately 800 isolates were obtained from seedling roots grown in unpasteurized soils and grouped by cultural and microscopic morphologies. The deleterious effects of 79 isolates from 21 major groups, most of which were soil-dwelling taxa, were examined after direct inoculation of the seminal roots. Isolates of Curvularia sp., Cirrenalia sp., Eppicoccum nigrum, Fusarium graminearum, F. oxysporum, Gliocladium virens, Humicola sp., Penicillium sp., Rhizoctonia oryzae-sativae, Sclerotium hydrophilum, Trichoderma aureoviride, and T. harzianum inhibited root growth, suggesting that deleterious root-infecting fungi were more common in paddy soil than previously thought. These fungi may be involved in the restraint of rice seedling growth.
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Link to article at publishers website
Database assignments for author(s): Hiromitsu Furuya, Shin-ichi Fuji

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Fusarium graminearum	Rice (Oryza)	Japan
	Ceratobasidium setariae	Rice (Oryza)	Japan
	Ceratorhiza hydrophila	Rice (Oryza)	Japan