Plug formation and peroxidase accumulation in two orders of siphonous green algae (Caulerpales and Dasycladales) in relation to fertilization and injury

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Abstract
A cytochemical survey of fourteen green algal species of the siphonous orders Caulerpales and Dasycladales has shown that plug formation during separation of reproductive organs and sterile side branches from the vegetative main axis is a common morphological characteristic in these algae. Additionally, in all these species peroxidase is accumulated almost exclusively in the plugs. Plugs in the siphonous green algae may play a role in protection of the cell interior against the external medium, either during normal development or after mechanical injury. Peroxidase may support this function by its possible antimicrobial activity.