Abstract
Coated vesicles in the contractile vacuole/mating structure region of Chlamydomonas are described in this report. Low-temperature fusion experiments and thin-section electron microscopy reveal the following: (a) coated membrane vesicles formed during minus activation are supplied by the contractile vacuole. (b) Upon activation minus gametes form a protuberant mating tubule. (c) The site-specific contact between the minus tubule and the tip of the plus fertilization tube is characterized by the presence of coated vesicles in the adjacent cytoplasm and dense material underlying the membrane in each mating type. (d) In the fully activated minus gamete, coated membrane associates with the mating structure. Possible roles for coated vesicles are suggested.
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