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The ultrastructure of the flagellar root system of Isochrysis galbana (Prymnesiophyta)

Published online by Cambridge University Press:  11 May 2009

T. Hori  and
J. C. Green
T. Hori
Affiliation:
Institute of Biological Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305 Japan
J. C. Green
Affiliation:
Plymouth Marine Laboratory, Citadel Hill, Plymouth, PL 2PB
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Extract

The fine structure of the flagellar root system of Isochrysis galbana Parke (Prymnesiophyta) has been investigated and a reconstruction is presented. Associated with the left basal body and arising close to the base of the haptonema there is a root composed of a ribbon of approximately five microtubules running peripherally towards the ventral side of the cell. Near the basal body it is also associated with two additional bundles of microtubules which diverge from it and from each other passing deep into the cell.

On the right-hand side of the right basal body there is a root consisting of four microtubules (2+2) which runs peripherally in a dorsal direction. Another root, consisting of a single microtubule only, originates close to the distal connecting band between the basal bodies, and passes around the ventral side of the left basal body before following a course deep into the cell. In addition, several fibrous bands connect the bases of the flagella and haptonema. The general arrangement of the root system of 1. galbana is comparable with many other members of the Prymnesiophyta, but attention is drawn to a number of important differences, particularly between Isochrysis and some other members of the order Isochrysidales. The results are discussed in the context of the evolution, phylogeny and taxonomy of the Prymnesiophyta.

On the right-hand side of the right basal body there is a root consisting of four microtubules (2+2) which runs peripherally in a dorsal direction. Another root, consisting of a single microtubule only, originates close to the distal connecting band between the basal bodies, and passes around the ventral side of the left basal body before following a curse deep into the cell.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 71 , Issue 1 , February 1991 , pp. 137 - 152
Copyright
Copyright © Marine Biological Association of the United Kingdom 1991

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