MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING

Flagella-like motion occurs in filamentous spermatozoa of coccid insects, which have diameters (0.16–0.65 µ) and lengths (150–300 µ) similar to those of long flagella, but have no doublets or 9 + 2-like arrangements of microtubules. Light and electron microscope investigations of spermatozoa from 10...

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Autor principal: Robison, W. Gerald
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1972
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108670/
https://www.ncbi.nlm.nih.gov/pubmed/4550099
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author Robison, W. Gerald
author_facet Robison, W. Gerald
author_sort Robison, W. Gerald
collection PubMed
description Flagella-like motion occurs in filamentous spermatozoa of coccid insects, which have diameters (0.16–0.65 µ) and lengths (150–300 µ) similar to those of long flagella, but have no doublets or 9 + 2-like arrangements of microtubules. Light and electron microscope investigations of spermatozoa from 10 species reveal many bizarre patterns of microtubules and suggest some basic similarities to flagella. Detailed analyses of spermatozoa which are naturally bent in definable planes during their elongation in the male and their storage in the female provide evidence that a constant topographical relationship is maintained between their unorthodox patterns of microtubules, as viewed in transections, and the direction of bending. The configuration common to most coccid spermatozoa consists of an acentrically positioned crescent of microtubules surrounded by one to several concentric rings. A line drawn to connect the two ends of the crescent appears to remain perpendicular to the plane of bending, and it defines a plane in which bisection of the spermatozoon produces halves with unequal numbers of microtubules. Bisection of the 9 + 2 motile apparatus in a plane perpendicular to that of bending also appears to produce halves with unequal numbers of microtubules. Therefore, the indispensable elements for flagellar and flagella-like motion may be microtubules arranged in "asymmetric" patterns.
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spelling pubmed-21086702008-05-01 MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING Robison, W. Gerald J Cell Biol Article Flagella-like motion occurs in filamentous spermatozoa of coccid insects, which have diameters (0.16–0.65 µ) and lengths (150–300 µ) similar to those of long flagella, but have no doublets or 9 + 2-like arrangements of microtubules. Light and electron microscope investigations of spermatozoa from 10 species reveal many bizarre patterns of microtubules and suggest some basic similarities to flagella. Detailed analyses of spermatozoa which are naturally bent in definable planes during their elongation in the male and their storage in the female provide evidence that a constant topographical relationship is maintained between their unorthodox patterns of microtubules, as viewed in transections, and the direction of bending. The configuration common to most coccid spermatozoa consists of an acentrically positioned crescent of microtubules surrounded by one to several concentric rings. A line drawn to connect the two ends of the crescent appears to remain perpendicular to the plane of bending, and it defines a plane in which bisection of the spermatozoon produces halves with unequal numbers of microtubules. Bisection of the 9 + 2 motile apparatus in a plane perpendicular to that of bending also appears to produce halves with unequal numbers of microtubules. Therefore, the indispensable elements for flagellar and flagella-like motion may be microtubules arranged in "asymmetric" patterns. The Rockefeller University Press 1972-01-01 /pmc/articles/PMC2108670/ /pubmed/4550099 Text en Copyright © 1971 by The Rockefeller University Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Robison, W. Gerald
MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title_full MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title_fullStr MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title_full_unstemmed MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title_short MICROTUBULAR PATTERNS IN SPERMATOZOA OF COCCID INSECTS IN RELATION TO BENDING
title_sort microtubular patterns in spermatozoa of coccid insects in relation to bending
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2108670/
https://www.ncbi.nlm.nih.gov/pubmed/4550099
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