A MECHANISM FOR SURFACE ATTACHMENT IN SPORES OF A PLANT PATHOGENIC FUNGUS
A MECHANISM FOR SURFACE ATTACHMENT IN SPORES OF A PLANT PATHOGENIC FUNGUS
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DOI：
10.1126/science.239.4837.288
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发表时间：
1988-01-15
期刊：
影响因子：
56.9
通讯作者：
VALENT, B
中科院分区：
文献类型：
--
作者：
HAMER, JE;HOWARD, RJ;VALENT, B
稻瘟病是由一种真菌引起的，这种真菌攻击水稻植株的所有地上部分。在对真菌附着到疏水性水稻叶表面的方法的研究中，人们发现稻瘟病菌的孢子(分生孢子)具有立即和持久附着到包括特氟隆在内的各种表面的机制。这种附着发生在孢子顶端，并被凝集素刀豆蛋白A阻断。水合分生孢子的显微镜显示，结合刀豆素A的孢子顶端粘液在芽管出现之前被特异性地从分生孢子顶端排出。干燥的分生孢子的超微结构分析显示，在顶端有大量的周质沉积，推测是孢子顶端的粘液。这些结果表明了一种新的植物病原真菌孢子附着到植物表面的机制。
Rice blast disease is caused by a fungus that attacks all above-ground parts of the rice plant. In a study of the means by which the fungus attaches to the hydrophobic rice leaf surface, it was found that spores (conidia) of the rice blast fungus Magnaporthe grisea have a mechanism for immediate and persistent attachment to various surfaces, including Teflon. This attachment occurs at the spore apex and is blocked by the addition of the lectin concanavalin A. Microscopy of hydrated conidia shows that a spore tip mucilage that binds concanavalin A is expelled specifically from the conidial apex before germ tube emergence. Ultrastructural analysis of dry conidia shows a large periplasmic deposit, presumably spore tip mucilage, at the apex. The results indicate a novel mechanism for the attachment of phytopathogenic fungal spores to a plant surface.