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Biol Bull 162: 171-181. (April 1982)
© 1982 Marine Biological Laboratory
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COLONY SPECIFICITY IN THE ASCIDIAN, PEROPHORA SAGAMIENSIS

HIROMICHI KOYAMA 1 and HIROSHI WATANABE 1

1 Shimoda Marine Research Center, The University of Tsukuba, Shimoda 5-10-1, Shizuoka 415, Japan

The presence of colony specificity, i.e., fusion-incompatibility, was revealed in Perophora sagamiensis.

When two fusible stolons made a tip-to-side contact, a protrusion appeared from the lateral portion of a stolon. The tests and epidermides of both stolons fused and blood exchange was established. When two nonfusible stolons came into contact, the tip of a stolon became inflated, and the lateral portion of the other stolon protruded with thickened epidermis. After a decrease in the blood stream, cellular parts of both stolons regressed.

Two types of nonfusion were found in Perophora sagamiensis and were termed "nonfusion type A" and "nonfusion type B," respectively. In nonfusion type A, two stolons rejected each other without fusion between the tests; while in nonfusion type B, rejection occurred after a transitory fusion of the tests. A given colony showed nonfusion type A to some colonies, and nonfusion type B to some other colonies.

Histological study of the process of nonfusion revealed amoebocytes and lymphocyte-like cells in the contact area.

Submitted on October 14, 1981
Accepted on January 25, 1982




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T. Ishii, E. Hirose, and Y. Taneda
Tunic Phagocytes Are Involved in Allorejection Reaction in the Colonial Tunicate Aplidium yamazii (Polyclinidae, Ascidiacea)
Biol. Bull., April 1, 2008; 214(2): 145 - 152.
[Abstract] [Full Text] [PDF]


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