Potassium homeostasis influences the locomotion and encystment of zoospores of plant pathogenic oomycetes
Potassium homeostasis influences the locomotion and encystment of zoospores of plant pathogenic oomycetes
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DOI：
10.1016/j.fgb.2004.11.003
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发表时间：
2005-03-01
影响因子：
3
通讯作者：
Gow, NAR
中科院分区：
文献类型：
--
作者：
Appiah, AA;van West, P;Gow, NAR
植物病原卵菌游动孢子在自然条件下具有不同的游动速度和游动方式。游动孢子游动受离子稳态和介质离子组成变化的影响。因此，我们使用视频显微镜调查游泳模式的五种卵菌物种的钾稳态的变化。游动孢子的大小与游动孢子的速度呈负相关。三种疫霉（Phytophthora palmivora，Phytophthora megakarya和Phytophthora infestans）以直线模式游动，速度范围从50到250妈妈/秒，而两种腐霉（Pythium aphanidermatum和Pythium dissotocum）以类似的速度游动，速度范围从180到225妈妈/秒，具有明显的螺旋轨迹和不同的振幅。高浓度的外源钾盐降低了棕榈酸单胞菌的游动速度，并诱导了包囊形成。Py未观察到这一点。aphanidermanan。钾离子载体短杆菌肽，尼日利亚菌素和缬氨霉素的应用导致游泳速度降低和疫霉属物种的游泳模式的变化。因此。钾离子在调节游动孢子行为中起关键作用。(C)2004年爱思唯尔公司All rights reserved.
Zoospores of plant pathogenic oomycetes exhibit distinct swimming speeds and patterns Under natural conditions. Zoospore swimming is influenced by ion homeostasis and changes in the ionic composition of media. Therefore, we used video microscopy to investigate swimming patterns of five oomycete species in response to changes in potassium homeostasis. In general,zoospore speed tended to be negatively correlated with zoospore size. Three Phytophthora species (Phytophthora palmivora, Phytophthora megakarya, and Phytophthora infestans) swain in straight patterns with speeds ranging from 50 to 250 mum/s whereas two Pythium species (Pythium aphanidermatum and Pythium dissotocum) swam at similar speeds ranging from 180 to 225 mum/s with a pronounced helical trajectory and varying amplitudes. High external concentrations of potassium salts reduced the swimming speed of Ph. palmivora and induced encystment. This was not observed for Py. aphanidermanan. Application of the potassium ionophores gramicidin, nigericin and valinomycin resulted in reduced swimming speeds and changes in the swimming patterns of the Phytophthora Species. Therefore. potassium tons play a key role in regulating zoospore behavior. (C) 2004 Elsevier Inc. All rights reserved.