植物病原菌菌の胞子に表面結合するメカニズム

J E Hamer, R J Howard, F G Chumley

Science (New York, N.Y.)

|January 15, 1988

まとめ

ライスブラストキノコの胞子は,植物表面に即座に結合するための新しい頂点機構を使用します. これは,水害を嫌う米の葉に付着するために不可欠な,胞子先の粘液を排出することを意味します.

科学分野:

植物病理学植物病理学
菌類学菌類学とは
バイオケミストリーバイオケミストリー

背景:

マグナポルテ・グライゼ (Magnaporthe grisea) によって引き起こされる米爆破病は,世界の米生産に大きな影響を及ぼしています.
宿主表面への真菌病原体の結合は,感染の重要なステップです.
付着メカニズムを理解することは,病気制御戦略の開発の鍵です.

研究の目的:

マグナポルテ・グリーゼア胞子が水嫌な表面に付着するメカニズムを調査する.
初期の真菌胞子粘着に関与する特定の成分と位置を特定する.
植物病原菌菌における新しい結合戦略を明らかにする.

主な方法:

水分と乾燥したコニディアの顕微鏡 (光と電子)
テフロンなどの排水性材料を含む,さまざまな表面への付着を評価する.
レクチン (コンカナヴァリンA) を使用して,粘着成分をブロックし,識別します.

主要な成果:

マグナポート (Magnaporthe grisea conidia) は,表面に即時かつ持続的な結合を示しています.
付着は胞子頂部に局所化し,特定の粘液によって媒介されます.
この胞子先の粘液は,生殖管の出現前に排出され,コンカナヴァリンAを結合する.
結合はコンカナヴァリンAによって抑制され,粘着におけるその役割を示しています.

結論:

アピカル粘液の排出を含む真菌胞子結合のための新しいメカニズムが特定されました.
このメカニズムは,マグナポルテ・グライセアの米の葉の表面への粘着を促進します.
発見は,植物病原体相互作用と潜在的な疾病管理目標に関する新しい洞察を提供します.

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