Inconspicuous restraint of rice seedling growth by root-infecting fungi in soil of a rice paddy field |
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Authors: | Hiromitsu Furuya Tsutomu Matsumoto Shin-ichi Fuji Hideki Naito |
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Institution: | (1) Faculty of Bioresource Sciences, Akita Prefectural University, Shimoshinjo, Akita 010-0195, Japan, JP;(2) Akita Prefectural College of Agriculture, Ogata, Akita, Japan, JP |
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Abstract: | Rice seedling growth, estimated by plant height and root development and discoloration, was better in pasteurized soil than
in unpasteurized soil obtained from a flooded rice field. Rice seedlings also grew better in sterilized soil modified by adding
roots harvested from the pasteurized soil than in soil modified by adding roots harvested from the unpasteurized soil. The
results demonstrate that seedling growth in the rice field soil was inhibited by soil microorganisms, even though no typical
symptoms such as seedling blight or damping-off appeared. Pythium aristosporum is suggested to be involved in the inhibition. Thus, it appears that inconspicuous restraint of rice seedling growth could
occur in soils of rice paddy fields.
Received: May 20, 2002 / Accepted: October 16, 2002
Acknowledgments The authors thank Dr. T. Ichitani, former professor at Osaka Prefectural University, for providing an isolate of Pythium aristosporum for comparison, and Mr. Mitsuaki Sato of Akita Prefectural College of Agriculture for technical assistance. |
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Keywords: | Minor root pathogen Rice seedlings Soil pasteurization Pythium aristosporum Flooded field soil |
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