Fine structure of the zoospore ofUlothrix belkae with emphasis on the flagellar apparatus |
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Authors: | G L Floyd H J Hoops J A Swanson |
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Institution: | (1) Botany Department, Ohio State University, 1735 Neil Avenue, 43210 Columbus, OH, USA;(2) Present address: Biology Department, Princeton University, 08540 Princeton, NJ, USA |
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Abstract: | Summary The anterior end of the zoospore ofUlothrix belkae has been examined in detail and is compared toStigeoclonium and other filamentous green algae. The nature of the symmetry of green algal motile cells is discussed and the term, 180° rotational symmetry, is proposed to describe the type of arrangement of anterior end components seen inU. belkae, including the four basal bodies, rootlets and striated fibers. The four microtubular rootlets are cruciately arranged. A striated microtubule-associated component (SMAC) has a periodicity of 6.4 nm and extends with each 2-membered rootlet posteriorly into the cell. One 5-membered rootlet passes very near the eyespot. Phylogeny in green algal motile cells is discussed. |
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Keywords: | Flagellar apparatus Green algae Phylogeny Striated fiber Symmetry Ulothrix |
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