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Sexual Crosses with the Mucoromycete Phycomyces blakesleeanus

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Sorocarp development by a newly discovered ciliate.

Science (New York, N.Y.)

|November 3, 1978

Summary

A newly found predatory ciliate exhibits unique development, forming a sorus of cysts after aerial aggregation. This sorogenesis process is dependent on alternating light and dark conditions.

Area of Science:

Protistology
Cellular biology
Developmental biology

Background:

Predatory ciliates represent a diverse group of microorganisms.
Unusual developmental strategies are key to understanding protist evolution.
Ciliate life cycles often involve complex morphological transformations.

Purpose of the Study:

To describe the novel developmental pattern of a recently discovered predatory ciliate.
To investigate the environmental triggers for the unique sorogenesis process.

Main Methods:

Observation of ciliate behavior in liquid culture.
Microscopic analysis of aggregated cells and cyst formation.
Controlled light and dark cycle experiments to assess sorogenesis requirements.

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Main Results:

Swimming cells aggregated on a substrate near the liquid surface.
The aggregate underwent aerial ascent, forming an acellular stalk and a sorus.
Sorogenesis was observed to be dependent on alternating light and dark periods.

Conclusions:

The predatory ciliate displays an unprecedented aerial sorogenesis.
Environmental cues, specifically light-dark cycles, are critical for this developmental process.
This finding expands the known repertoire of developmental strategies in ciliates.