• Title/Summary/Keyword: P. monospermum

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Effect of Water Potential on Mycelial Growth and Sporangial Formation by Pythium spp. (Water Potential이 Pythium속(屬) 균(菌)의 균사(菌絲) 신장(伸長)과 Sporangia 형성(形成)에 미치는 효과(效果))

  • Sung, Jae-Mo
    • The Korean Journal of Mycology
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    • v.11 no.3
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    • pp.105-108
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    • 1983
  • The mycelial growth of Pythium graminicola, P. ultimum, P. rostratum was best at -3 osmotic potential. P. monospermum was best grown at -8 bars osmotic potential. Mycelial growth by Pythium spp. was prevented at -42 bars for P. graminicola, P. ultimum and P. monospermum. Sporangial formation by P. graminicola and P. ultimum was influenced by water potential in much the same way as mycelial growth: -3 bars was maximum and -42 bars or below was minimal. Pythium spp. tested was grown faster on PDA than other media including oat meal agar. P. ultimum was best grown on any media among Pythium spp. tested.

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Identification and Pathogenicity of Pythium spp. Associated with Seedling Damping Off of Rice (벼 모 마름병(病)을 일으키는 Pythium속(屬) 균(菌)과 병원성(病原性))

  • Sung, Jae-Mo;Jin, Kyoung-Sik;Lee, Seung-Chan;Park, Jong-Seung
    • The Korean Journal of Mycology
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    • v.11 no.1
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    • pp.27-32
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    • 1983
  • Five species of the genus Pythium were identified from 91 isolates which were collected from rice seedlings in machine transplanting nursery boxes and paddy fields in Korea. They included P. graminicola complex, P. monospermum complex, P. rostratum complex, and P. ultimum complex. The most frequently found species of the genus Pythium was P. graminicola complex followed by P. monospermum complex. Rice seed germinability was greatly decreased by being infested with P. graminicola complex at nursery box. P. graminicola complex was the most virulent in terms of prohibiting germinations and stunting plants in nursery boxes.

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