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The primary and secondary spore cyst of aphanomyces oomycetes saprolegniales


Nordic Journal of Botany 4(5): 681-696
The primary and secondary spore cyst of aphanomyces oomycetes saprolegniales
The ultrastructural organization of the primary (1.degree.) and secondary (2.degree.) cysts of A. astaci and A. laevis is extremely similar, and similar to that of the 1.degree. and 2.degree. cysts of A. euteiches as presented earlier by Hoch and Mitchell. Synchronous populations of 2.degree. cysts can be induced by mechanical shock and encystment appears essentially instantaneous. The cyst coat-wall apparently is formed extremely rapidly from material from the peripheral vesicles with flocculent content. After encystment the microtubule cytoskeleton found in the zoospore is maintained in the 1.degree. and 2.degree. cyst (i.e., the single microtubules which extend along the pyriform nucleus from the kinetosomes-centrioles and the bundles of closely appressed microtubules are retained). The peripheral vesicles with granular content found in the zoospore are not seen in the 1.degree. or 2.degree. cyst. Multivesicular bodies and lomasomes are observed in the 1.degree. and 2.degree. cyst which are not found in the zoospore. The peripheral cisternae of the zoospore are lost upon encystment and may be formed from dictyosome-derived vesicles during excystment of the 1.degree. and 2.degree. cyst. The U-body of A. astaci has a paracrystalline content while that of A. laevis or of A. euteiches has a tubular content. A microbody-lipid body complex (sensu Powell) is found in the 1.degree. and 2.degree. cysts of A. laevis but not in A. astaci or A. euteiches. The significance of the presence of a microbody-lipid body complex in a biflagellate zoospore is discussed.


Accession: 006740702

DOI: 10.1111/j.1756-1051.1984.tb01994.x



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