{"created":"2021-03-01T06:13:48.534765+00:00","id":10922,"links":{},"metadata":{"_buckets":{"deposit":"1c8a0030-9f85-4855-a3a7-738bce1e3479"},"_deposit":{"id":"10922","owners":[],"pid":{"revision_id":0,"type":"depid","value":"10922"},"status":"published"},"_oai":{"id":"oai:soar-ir.repo.nii.ac.jp:00010922","sets":["1016:1018:1019:1069"]},"author_link":["34197"],"control_number":"10922","item_10_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1960-12-25","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"3","bibliographicPageEnd":"354","bibliographicPageStart":"279","bibliographicVolumeNumber":"2","bibliographic_titles":[{"bibliographic_title":"信州大学農学部紀要"}]}]},"item_10_description_20":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"Little has been found out about the mechanism of damping-off affected complex soil environments, since it was difficult to know the actual phase on the activity of pathogenic fungi. The subject of the studies is to investigate on the breeding condition of damping-off which is influenced by the condition of a nursery-bed and on the change of microflora in soil, and to make evident the biological correlation among plants and pathogenic fungi and other soil fungi. Including Aspergillus which represented the ordinary soil of nursery and Penicillium which characterized the soil of nursery soon after cultivated the forest of a Japanese red pine, the microflora which analized by the Dilution-Plate method before sowing showed, as a rule, that the number of fungi was a few and a biological harmony had been correlatively maintained among the each species. The microflora after sowing, however, showed remarkable change, that is, on the part where damping-off broke out the number of fungi remarkably increased, and those microflora revealed abnormal phase of broken harmony. Namely, the more seeds sowed the more injury of damping-off increased, and microflora came to reveal prejudiced phase, Especially Gliocladiusn fimbriatum and Fusarium spp. remarkably increased so on the part where injury was notable. When the injury had trifled, however, the,,microflora had tendency to come back to original stable phase.The influence of inorganic fertilizer on damping-off largely varied according to the soil condition of a nursery. On the meager nursery soon after cultivating the pine forest the fertilization of lime and nitrogen increased injury and it caused abnormal increment of G. fimbriatum and P, spp. . As for organic fertilizer, the fertilization of stable manure increased injury and the abnormal phase of the microflora caused by the increment of G. fimbriatum was considerably recognized on the infected part. Besides such fungi as above which abnormally increases, Phoma or Aspergillus etc. were also recognized in soil, many or few according to the places or times of infection. The Pathogenicity of main soil fungi which were separated from a nursery after out break of a injury differed by the conditions of inoculation and by the kinds of tested plants. For example, Phoma sp. showed negligible pathogenicity on a Japanese red pine, but it showed remarkable pathogenicity and inhibiting action of growth on a cucumber. And G. penicilloides, F. sp. 1 and A. sp. 1 respectively showed less remarkable pathogenicity on a cucumber, a Japanese red pine and both of them. On the other hand F. sp. 3 seemed to show very remarkable pathogenicity on a cucumber. In the result that we treated the culture filtrate of those fungi with several methods on the bud or the root of a young cucumber, marked toxicity was recognized in the culture filtrate of Phoma sp. and F. sp. 3. The fungi such as above may not have ability to attack directly on the living tissue of a plant, but they at least can inhibit the growth of a plant with wilt toxin such as fusaric acid contained in metabolic product of some fungi, therefore, it is presumed that the fungi may easily attack a plant tissue, having decreased beforehand resistance of a plant for pathogenic fungi or having withered it. Most of pathogenic fungi which were separated from the infected seedlings in nursely were Rhizoctonia spp. . No toxicity was seen in the culture filtrate of Rhizoctonia spp. and F. oxysporum having vehement pathogenicity, and its filtrate hardly showed influence on the growth of a plant. On the other hand, inoculated A. sp. 2, G, fimbriatum, Hormodendrum sp, and F. sp. 2 which pathogenicity was not or a little, in soils, it was showed to elongate respectively 200-300% on a cucumber and 40-60% on a Japanese red pine as compared with these check plants, during the inoculating interval of 2-3 weeks. Similarly the plant-growth-promoting effect could also be seen when the culture filtrate of fungi was treated on the seedlings of a cucumber with several methods, above all the elongating effect of culture filtrate of G. fimbriatum was remarkably noticed. As the result of avena straight-growth test using a paper chromatography, however, the metabolic product in its filtrate proved to be a different quality from Gibberellin. Then, the seeds of cucumber which had been immersed in culture filtrate of G. fimbriatum beeing sowed in natural soil, it was proved that resistance of plant for pathogenic fungi decreased and injury of damping-off considerably increased. Thus it was supposed that the plant-growth-promoting effect of soil fungi promoted the spread of disease, for it caused a marked elongation of shoots. As the result that we inoculated a large quantity of soil fungi which had been cultured on cutting straws, in natural soil put into a pot, inoculation of G. fimbriatum remarkably increased injury of damping-off, while A. sp. 1 showed no influence. Judging from the above, it was recognized that the activity of fungi as G. fimbriatum which had plant-growth-promoting effect and no pathogenicity was liable to cause more injury than the fungi as A. sp. 1 which showed more or less pathogenicity in natural soils. Besides there live various fungi which associate the spread of damping-off and increase its injury in natural soil, also must exist other kinds of fungi which inhibit the outbreak of disease. As a result of the experiment that we inoculated the mycelium of T. lignorum which had been cultured on cutting straws in natural soil, for controling microflora with antibiotic fungi, it was proved that the injury of damping off remarkably decreased in the experiments both a nursery and a pot. And it was recognized that microflora after inoculation of fungi has continued the dominant phase of T. lignorum for a considerably long time. Therefore the prevention of damping-off to use antibiotic fungi may be still more hopeful, not perfect though. Evidently from the above, in natural soils it must be not a few to keep some biological harmony correlatively well balanced with the various kinds of fungi, which promote the outbreak of damping-off, with abnormaly elongating the growth of a plant or inhibiting it, or which disturb the activity of pathogenic fungi. As for prevention of the disease, therefore, it was presumed that we first of all had to find out the most effective method which was able to control microflora in soils.","subitem_description_type":"Abstract"}]},"item_10_description_30":{"attribute_name":"資源タイプ（コンテンツの種類）","attribute_value_mlt":[{"subitem_description":"Article","subitem_description_type":"Other"}]},"item_10_description_5":{"attribute_name":"引用","attribute_value_mlt":[{"subitem_description":"信州大学農学部紀要 2(3): 279-354(1960)","subitem_description_type":"Other"}]},"item_10_publisher_4":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"信州大学農学部"}]},"item_10_source_id_35":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0583-0621","subitem_source_identifier_type":"ISSN"}]},"item_10_source_id_40":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00121352","subitem_source_identifier_type":"NCID"}]},"item_1627890569677":{"attribute_name":"出版タイプ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_970fb48d4fbd8a85","subitem_version_type":"VoR"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"赤井,  龍男"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2015-09-25"}],"displaytype":"detail","filename":"Agriculture02-03-04.pdf","filesize":[{"value":"6.9 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"Agriculture02-03-04.pdf","url":"https://soar-ir.repo.nii.ac.jp/record/10922/files/Agriculture02-03-04.pdf"},"version_id":"25f8cd31-f7bd-426c-b984-f48f710c4d1a"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"土壌微生物学的にみた稚苗立枯病の研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"土壌微生物学的にみた稚苗立枯病の研究","subitem_title_language":"ja"},{"subitem_title":"Studies on Damping-Off of Seedlings from Soil Microbiological Point of View.","subitem_title_language":"en"}]},"item_type_id":"10","owner":"1","path":["1069"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2009-03-03"},"publish_date":"2009-03-03","publish_status":"0","recid":"10922","relation_version_is_last":true,"title":["土壌微生物学的にみた稚苗立枯病の研究"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-01-04T00:26:09.529846+00:00"}