HOME    About this site    mypage    Japanese    library    university    Feedback

University of the Ryukyus Repository >
Faculty of Agriculture >
Bulletin >
The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus >
No.32 (1985/12) >

 
Title :Rhizoctonia solani Kuhn と Sclerotinia sclerotiorum (Libert.) de Bary の菌核生存に及ぼす 2,3 の物理的要因の影響(農学科)
Title alternative :Effects of two or three physical factors on sclerotial longevity of Rhizoctonia solani Kuhn and Sclerotinia sclerotiorum (Libert.) de Bary (Department of Agriculture)
Authors :諸見里, 善一
Authors alternative :Moromizato, Zenichi
Issue Date :2-Dec-1985
Abstract :2種類の代表的菌核形成菌, Rhizoctonia solani KuhnとSclerotinia sclerotiorum(Libert.)de Baryを用いて菌核形成過程における諸形態の温度, 紫外線及びpH耐性を調べた。菌核形成時の各段階の耐温度性は両菌とも菌糸<菌核原基<白色菌核<着色直後の未熟菌核<成熟菌核の順であり, 特に成熟菌核は他の段階に比べて3&acd;7C高かった。紫外線耐性は菌糸と他の段階では大きな差があり, 両菌とも菌糸は15&acd;30分の照射で死滅したが, 菌核原基ではR.solaniで3&acd;5日, S.sclerotiorumでは1&acd;2日の照射で死滅した。さらに, 白色菌核以降の段階では10日間照射してもすべて生存していた。菌核原基は菌糸が分岐化して織り込みあった構造であるが中心部を紫外線から物理的に保護する程は分化しておらず, したがって紫外線耐性になった原因は, 菌糸自体の生理的変化によると考えられる。また, 成熟菌核のpH耐性は酸性域(pH4&acd;5)で低く, pH6以上の中性及びアルカリ性域で高かった。
Effects of temperature, ultraviolet irradiation and pH on the longevity of the various morphological stages from hyphae to matured sclerotia of two typical sclerotium-forming fungi, Rhizoctonia solani and Sclerotinia sclerotiorum, were examined. The order of high-temperature tolerance of each morphological stage was hyphae <initials <white sclerotia <immatured sclerotia <matured sclerotia. Matured sclerotia, in particular, resisted to 3-7 Chigher temperature than other stages. Rhizoctonia solani was more tolerant than Sclerotinia sclerotiorum in every stages. As ultraviolet irradiation to each stage, hyphae became extinct for 15-30min. irradiation, whereas initials for 3-5 days irradiation in Rhizoctonia solani and for 1-2 days in Sclerotinia sclerotiorum. On the other hand, all stages on and after white sclerotia survived even at the irradiation applied for 10 days. Initial which is formed by hyphal branching followed by aggregation and interweaving changed to more tolerant to UV than hyphae, suggesting that striking phygiological turning could happen on the initials stage. Matured sclerotia of two fungi died at pH 4-5,but survived above pH 6.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/3935
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.32 p.29 -33
Appears in Collections:No.32 (1985/12)

Files in This Item:

File Description SizeFormat
KJ00000162232.pdf281KbAdobe PDFView/Open