The anterior-like cells in Dictyostelium are required for the elevation of the spores during culmination |
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Authors: | John Sternfeld |
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Institution: | (1) Department of Biological Sciences, State University of New York at Cortland, Cortland, NY 13045, USA, US |
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Abstract: | Shortly after initiation of Dictyostelium fruiting body formation, prespore cells begin to differentiate into non-motile spores. Although these cells lose their ability
to move, they are, nevertheless, elevated to the tip of the stalk. Removal of the amoeboid anterior-like cells, located above
the differentiating spores in the developing fruiting body, prevents further spore elevation although the stalk continues
to elongate. Furthermore, replacement of the anterior-like cells with anterior-like cells from another fruiting body largely
restores the ability to lift the spores to the top of the stalk. However, if amoeboid prestalk cells are used to replace the
anterior-like cells, there is no restoration of spore elevation. Finally, when a droplet of mineral oil replaces differentiating
spores, it is treated as are the spores: the mineral oil is elevated in the presence of anterior-like cells and becomes arrested
on the stalk in the absence of anterior-like cells. Because a similar droplet of mineral oil is totally ignored by slug tissue,
it appears that there is a dramatic transformation in the treatment of non-motile matter at this point in Dictyostelium development.
Received: 26 January 1998 / Accepted: 27 May 1998 |
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Keywords: | Dictyostelium Anterior-like cells Culmination |
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