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Free Content Individuality in the Blastogenesis of the Ascidian, Polyzoa Vesiculiphora 1. Determination of the Stage in Which the Organization Center is Established

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Stolons of the ascidian, Polyzoa vesiculiphora, form “stolonic buds” that develop into new individuals by blastogenesis. Stolons artificially isolated from their parent also develop into an individual. If such a stolon is kept ligated at the middle for a few days, two individuals are formed from the stolon, while if the ligature is removed within 20 h, only one zooid is formed from the stolon. We hypothesize that a critical period exists during which an organizing center is established. If such a center is able to suppress the establishment of the second center, only one individual forms from the stolon. The establishment of such a center, therefore, seems to mark the establishment of individuality. By varying the starting and duration of ligation we determined the stage in which the hypothetical organization center is established. The results suggest that the center is formed 30–40 h after isolation of stolons from their parents. Histological study suggests that the stage at which the center forms corresponds roughly to the stage in which the first notable morphological event, formation of the gut rudiment, occurs.

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Document Type: Research Article

Publication date: 1989-09-01

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