Summary
Light and electron microscope studies on the fine structure of the stigma ofAcetabularia gametes and on its behaviour after gamete-fusion are described.
The stigma, located within the single gamete-chloroplast, is composed of two layers of nearly hexagonal units, separated by double membranes.
After gamete-fusion the young zygote cell contains two eye-spots, according to its two chloroplasts derived from each gamete cell. In later stages of zygote development the eyespots appear fragmented. There are indications that stigma fragments become distributed to newly formed chloroplasts.
In zygote cells neither fusion of the gamete-chloroplasts nor of the eye-spots were observed.
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Literatur
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Kellner, G., Werz, G. Die Feinstruktur des Augenfleckes beiAcetabularia-Gameten und sein Verhalten nach der Gametenfusion. Protoplasma 67, 117–120 (1969). https://doi.org/10.1007/BF01256772
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DOI: https://doi.org/10.1007/BF01256772