Abstract
AbstractDechorionated neurulae and early tail‐bud embryos of Ciona intestinalis (Linnaeus) develop into tadpole larvae without fully formed dorsal, ventral, or caudal fins, although other aspects of organ and tissue development appear normal. Groups of dechorionated neurulae treated with the reducing agent glutathione exhibit a 5‐8% enhancement in caudal fin length compared with dechorionated controls. Other reducing substances tested, namely, gallic acid, chlorogenic acid, cysteine, and dithiothreitol, had no effect on fin formation, possibly due either to their rapid oxidation in aerated seawater (chlorogenic and gallic acids) or to kinetic inertness (dithiothreitol and cysteine). These results imply that larval fin morphogenesis requires secretion of a specific reducing substance.
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