title: Stomatogenesis in Paramecium tetraurelia: The roles of the micronucleus and the pre-existing oral apparatus.
abstract: Removal of the micronuclei from Paramecium generated amicronucleate cell lines which produced oral apparatuses of much reduced length and abnormal oral membranellar pattern during an initial depression period. They subsequently recovered, but only partially. Reimplantation of the amicronucleates with micronuclei generally allowed a greater oral length to be reached in renucleated cell lines, and more normal membranellar pattern in some, but full recovery was frequently not attained even in these. However, the length of the oral apparatuses produced by the renucleated cells during autogamy, when the pre-existing oral apparatus degenerates, were mostly comparable to those of micronucleate controls. These relationships are discussed in terms of the control of development of the oral apparatus by the micronucleus and the preexisting oral apparatus.
authors.affiliation: Zoology Department, University of Hong Kong, Hong Kong.
authors.forename: S F
authors.initials: SF
authors.lastname: Ng
authors.forename: L W
authors.initials: LW
authors.lastname: Tam