Calcium-Dependent, Genus-Specific, Autoaggregation of Zoospores of Phytopathogenic Fungi

Experimental Mycology Pub Date : 1995-09-01 DOI:10.1006/emyc.1995.1025

Brian Reid, B.Michael Morris, Neil A.R Gow

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引用次数: 53

Abstract

Reid, B., Morris, B. M., and Gow, N. A. R. 1995. Calcium-dependent, genus-specific, autoaggregation of zoospores of phytopathogenic fungi. Experimental Mycology , 19, 202-213. Dense populations of zoospores of Phytophthora palmivora , Pythium catenulatum, and Pythium dissotocum formed multicell clumps, or autoaggregates. Autoaggregation was the result of active taxis and was shown to be density-dependent, calcium-requiring, and influenced by pH. In addition, autoaggregation appeared to be species-specific, since aggregates of Ph. palmivora did not attract zoospores of three Pythium species and aggregates of Py. catenulatum did not attract Ph. palmivora zoospores. Aggregation centers generated a calcium ion gradient and induced chemotropic growth of germ tubes emerging from zoospore cysts. Autoaggregation also functions to enhance zoospore accumulation at plant root surfaces, thereby increasing inoculum potential for infection. In the absence of roots, autoaggregation may enhance zoospore population survival.

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植物致病真菌游动孢子的钙依赖性、属特异性、自聚集

Reid, B.， Morris, B.， and Gow, n.a.r. 1995。植物致病真菌的游动孢子的钙依赖性，属特异性，自聚集。微生物学通报，2009,32(2):481 - 481。棕榈疫霉(Phytophthora palmivora)、钩状霉(Pythium catenulatum)和异芽霉(Pythium dissotocum)的游动孢子密集的种群形成多细胞团块或自聚集体。自聚集是主动趋同的结果，是密度依赖的、需要钙的，并受ph的影响。此外，自聚集似乎是种特异性的，因为pH. palmivora的聚集体不吸引三种Pythium的游动孢子和Py的聚集体。钩藤不吸引棕榈Ph. zomivora游动孢子。聚集中心产生钙离子梯度，诱导游孢子囊胚管的趋化生长。自聚集也可以促进游动孢子在植物根表面的积累，从而增加感染的接种潜力。在没有根的情况下，自聚集可能会提高游动孢子种群的存活率。

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Experimental Mycology

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