南近畿地方の土壌から分離した<i>Pythium</i>菌の種と分布 Kinds and Distribution of Pythium Species Isolated from Soils in South Kinki District.

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南近畿地方の土壌に生息する<i>Pythium</i>菌の種と分布を明らかにするため,キュウリ種子による捕捉法を用いて菌を分離し,調査した。供試した28試料中26試料から1試料当り1∼7種の<i>Pythium</i>菌が分離または検出されたが,2試料からは全く分離できなかった。分離した合計253菌株は,H-Zs(糸状胞子嚢から遊走子を形成するが,生殖器官は未形成の一群)を含む18種に分類・同定できた。最も一般的に分布していたH-Zsは,20ヵ所から52菌株が分離された。次いで,<i>P. sylvaticum, P. irregulare, P. ultimum, P. aphanidermatum</i>の分布が広く,10∼15ヵ所から23∼30菌株が分離された。

Soil samples from 28 locations (4-10 samples/Pref.) in South Kinki district were assayed for <i>Pythium</i> taxa by a trapping isolation method with cucumber seeds as a baiting substrate. One to seven taxa/sample (=location) were isolated or detected from 26 samples, but no <i>Pythium</i> was isolated from two samples from Wakayama prefecture. A total of 253 isolates were identified into 18 taxa including H-Zs, a provisional <i>Pythium</i> group with zoospore formation from hypha-like sporangia, but without sexual organs. Among these fungi, H-Zs was predominantly isolated from 20 samples, followed by <i>P. sylvaticum, P. irregulare, P. ultimum</i>, and <i>P. aphanidermatum</i>, all of which were isolated from 10-15 samples.

Journal

  • Japanese Journal of Phytopathology

    Japanese Journal of Phytopathology 58(3), 360-365, 1992

    The Phytopathological Society of Japan

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