ATTRACTION AND ATTACHMENT OF ZOOSPORES OF PARASITIC CHYTRID ROZELLA-ALLOMYCIS IN RESPONSE TO HOST-DEPENDENT FACTORS
ATTRACTION AND ATTACHMENT OF ZOOSPORES OF PARASITIC CHYTRID ROZELLA-ALLOMYCIS IN RESPONSE TO HOST-DEPENDENT FACTORS
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DOI：
10.1007/bf02451752
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发表时间：
1974-01-01
影响因子：
2.8
通讯作者：
HELD, AA
中科院分区：
文献类型：
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作者：
HELD, AA
本研究研究了专性寄生的内生合格氏菌的游动孢子在各种腐生真菌幼体中的行为，以确定控制其发育的寄主依赖因素。用倒置显微镜连续观察肉汤或琼脂培养皿中寄生虫与宿主的相互作用。两个因素似乎控制了褐飞虱侵袭的初始阶段：(I)吸引褐飞虱孢子的可溶性渗出物；(Ii)细胞壁表面的受体，使褐飞虱休眠孢子附着、包囊和随后立即萌发。一种相关的、不敏感的物种，EmersonBlastocladiella Emersonii，也吸引Rozellazoosports，但支持非常有限的附着。Rozellazoosports既不聚集在非芽生真菌的幼体周围，也不附着在幼小的菌体上。这种寄主特有的行为模式与腐生和兼生寄生藻类的行为模式进行了比较，后者的游动孢子表现出非特异性的趋化反应，不需要受体来附着、包囊和萌发。
This study examined the behavior of populations of zoospores of the obligately parasitic, endobiotic chytridRozella allomycistowards young, vegetative thalli of various saprophytic fungi, in order to identify host-dependent factors which control the development ofRozella. An inverted microscope was employed for continuous observation of parasite-host interaction in petri dishes of broth or agar medium. Two factors appear to control the initial stages of invasion byRozellaof both susceptible and resistant species of the host genus,Allomyces: (i) a soluble exudate which attractsRozellazoospores, (ii) a receptor on the cell-wall surface which causesRozellazoospores to adhere, and to encyst and to germinate immediately thereafter. A related, nonsusceptible species,Blastocladiella emersonii, also attractsRozellazoospores, but supports very limited attachment.Rozellazoospores neither accumulate around, nor adhere to young thalli of non-blastocladialean fungi. This host-specific behavior pattern is compared with that of saprophytic and facultatively parasitic Phycomycetes, whose zoospores show nonspecific chemotactic responses and require no receptor for attachment, encystment and germination.