title: Calcium-induced contraction of the rhizoplast of a quadriflagellate green alga.
abstract: The rhizoplast of Platymonas subcordiformis is a contractile organelle. Cyclic contraction and extension are induced by incubating the organism in solutions containing calcium and adenosine triphosphate. Rhizoplast contraction is functionally linked to flagellar activity.
authors.forename: J L
authors.initials: JL
authors.lastname: Salisbury
authors.forename: G L
authors.initials: GL
authors.lastname: Floyd