Negative Geotaxis of Zoospores of the Fungus Phytophthora
Negative Geotaxis of Zoospores of the Fungus Phytophthora
复制标题
疫霉菌游动孢子的负趋地性
DOI：
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发表时间：
1977
期刊：
影响因子：
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通讯作者：
M. Carlile
中科院分区：
文献类型：
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作者：
J. N. Cameron;M. Carlile
Ho & Hickman（1967 a）发现大籽疫霉的游动孢子在水悬浮液中仅在表面下积累。这种效应的一个合理解释是积极的好氧性，这在微生物中很普遍（Carlile，I 975）。然而，当含有这些气体的毛细管被置于游动孢子悬浮液中时，大孢子囊菌游动孢子没有表现出对空气的吸引力或对二氧化碳的排斥力，这表明无论是以对氧气的吸引力还是对二氧化碳的排斥力的形式出现的趋气性都不是造成这种效应的原因（Ho & Hickman，1967 b）。我们也发现，在水悬浮液中，疫霉游动孢子倾向于聚集在液体的顶部附近，并得出结论，这种效果是由于负趋地性，即与重力吸引相反的主动游动。
Ho & Hickman (1967a) found that zoospores of Phytophthora megasperma in an aqueous suspension accumulated just below the surface. A plausible explanation for such an effect would be positive aerotaxis, which is widespread in micro-organisms (Carlile, I 975). However, P. megasperma zoospores showed no attraction to air or repulsion from carbon dioxide when capillaries containing these gases were placed in zoospore suspensions, suggesting that aerotaxis, either in the form of attraction to oxygen or repulsion from carbon dioxide, was not responsible for the effect (Ho & Hickman, 1967b). We, too, have found that in aqueous suspension Phytophthora zoospores tend to accumulate near the top of the liquid and conclude that the effect is due to negative geotaxis active swimming in opposition to the attraction of gravity.