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T. Marumoto
Article type: Article
2002 Volume 56 Issue 2 Pages
59-62
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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Shin Haruta
Article type: Article
2002 Volume 56 Issue 2 Pages
63-67
Published: October 01, 2002
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Kazutaka Kuroda
Article type: Article
2002 Volume 56 Issue 2 Pages
69-74
Published: October 01, 2002
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Yimi Cai
Article type: Article
2002 Volume 56 Issue 2 Pages
75-83
Published: October 01, 2002
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Ryo Fukui
Article type: Article
2002 Volume 56 Issue 2 Pages
85-93
Published: October 01, 2002
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Koya Sugawara
Article type: Article
2002 Volume 56 Issue 2 Pages
95-102
Published: October 01, 2002
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Kazuhira Yokoyama, Takahiro Tateishi, Nobuyuki Kohno, Masanori Saito, ...
Article type: Article
2002 Volume 56 Issue 2 Pages
103-108
Published: October 01, 2002
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Kazutaka Akashi, Shigeyoshi Takakura
Article type: Article
2002 Volume 56 Issue 2 Pages
109-115
Published: October 01, 2002
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The nematode fauna was investigated in fields with long-term continuous and rotational cropping of arable crops in Hokkaido Kitami Agricultural Experiment Station from the 30th year to the 36th year. The plant parasitic nematodes which showed an increase of population density in the continuous cropping plots were as follows; Heterodera glycines on soybean and kidney bean, Meloidogyne hapla on potato, Paratylenchus sp. on sugar beet, Pratylenchus spp. on soybean. On the other hand, the population density of the root lesion nematodes decreased under continuous cropping of sugar beet. Similar relationships observed in the continuous cropping of potato and sugar beet were also observed in the surveys in Abashiri district in Japan. It was concluded that the rotation cycle of host crops suitable for suppressing any of the plant parasitic nematodes listed above except for Pratylenchus spp. was more than 4 years.
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K. S. Kang, K. Itoh, N. Kaneko, M. Murabayashi, J. Nakanishi
Article type: Article
2002 Volume 56 Issue 2 Pages
117-124
Published: October 01, 2002
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We applied length polymorphism (LPM) of PCR-amplified DNA fragments from the 16S ribosomal RNA gene (16S rDNA) to analyze bacterial communities in soil. The PCR (polymerase chain reaction) primers were designed to classify soil bacteria into three groups: 1) the α and δ subclasses of Proteobacteria, 2) the β and γ subclasses of Proteobacteria, and 3) the flexibacter and Gram- positive bacteria. Eight variable regions of 16S rDNA were analyzed, and as a result, region 1 of 16S rDNA was found to be effective for LPM analyses. Bacterial DNA was extracted directly from the soil samples, and the LPM patterns for the PCR-amplified DNA fragments were obtained using a high- resolution gel. We observed substantial changes in the LPM patterns, which were attributed to the changes in the vegetation and to seasonal changes. These changes showed that the proposed technique can be applied for monitoring changes in bacterial communities.
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Zen-ichi Moromizato, Megumu Tanahashi, Satoshi Taba, Keiji Motomura, S ...
Article type: Article
2002 Volume 56 Issue 2 Pages
125-131
Published: October 01, 2002
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Factors affecting the inactivation of Trichoderma species in soils ranging from neutral to alkaline were investigated. Even though the fungus was isolated from the pineapple field soil (pH 4.2), the most suitable pH value for spore formation was 6.0. When the fungus was incubated in buffered liquid media, the medium at pH 4.0 shifted to the alkaline side and the one at pH 8.0 shifted to the acid side, but almost no change was observed for the medium at pH 6.0. Thus the direct effect of the pH as well as indirect influence of the microorganisms in Kunigami mahji, with common parent material but differing in the pH value were investigated. Fungal activity in a vegetable field soil (pH 7.8) was about three times higher than that of the pineapple field soil (pH 4.2), four times for actinomycetes and five times for bacteria. Comparison of the antagonistic ratio of the fungi isolated from both soils against Trichoderma lignorum (RT-11), the vegetable field soil had twice as many fungi as the pineapple field soil. There were many Aspergillus species isolated from the vegetable field soil which showed a strong antagonism with T. lignorum (RT-11). Since the culture filtrate of Aspergillus spp. did not affect T. lignorum (RT-11), it was assumed that the observed antagonism was not due to mycoparasitism, lysis or antibiosis but to competition for nutrients or habitats. In conclusion, the inactivation of Trichoderma in neutral and alkaline soils was attributed to the indirect effect of soil microorganisms as well as to the direct effect of the soil pH.
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
133-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
133-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
134-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
134-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
135-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
135-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
136-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
137-
Published: October 01, 2002
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Jingchun TANG, Yasushi INOUE, Tsuyoshi YASUTA, Shigekata YOSHIDA, Arat ...
Article type: Article
2002 Volume 56 Issue 2 Pages
137-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
138-
Published: October 01, 2002
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[in Japanese], Cho Cho Tun, [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
138-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
139-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
140-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
140-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
141-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
141-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
142-
Published: October 01, 2002
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[in Japanese], I. Maldonado-Mendoza, G. Dewbre, M. J. Harrison, [in Ja ...
Article type: Article
2002 Volume 56 Issue 2 Pages
142-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
143-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
143-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
144-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
144-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
145-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
145-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
146-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
146-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
147-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], M. L. Herr ...
Article type: Article
2002 Volume 56 Issue 2 Pages
147-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
148-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
148-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
149-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
149-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
150-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
150-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
151-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
151-
Published: October 01, 2002
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[in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
152-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
152-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2002 Volume 56 Issue 2 Pages
153-
Published: October 01, 2002
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2002 Volume 56 Issue 2 Pages
153-
Published: October 01, 2002
Released on J-STAGE: May 31, 2017
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