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LAUDERIA ANNULATA —A MARINE CENTRIC DIATOM WITH AN ELONGATE BILOBED NUCLEUS 1
Author(s) -
Robert W. Holmes
Publication year - 1977
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/j.1529-8817.1977.tb02909.x
Subject(s) - nucleus , biology , lobe , feulgen stain , diatom , nuclear membrane , vacuole , biophysics , cytoplasm , anatomy , interphase , cell nucleus , chloroplast , botany , microbiology and biotechnology , biochemistry , dna , gene
Lauderia annulata Cleve is probably unique among marine centric diatoms in possessing an elongate dumbbell‐shaped nucleus. A lobe at, each end of the nucleus lies adjacent to each valve during interphase and each lobe resembles a typical eucaryotic nucleus. The central portion of the thin strand, which passes through the vacuole connecting the two lobes is Feulgen positive and is nuclear membrane bounded. A group of micro tubules occurs in this strand clustered excentrically between, the nuclear membrane and the tonoplast. Evidence for the coordinated functioning of both nuclear lobes is suggested, by the aggregation of chloroplasts around, both lobes when shade‐adapted cells are exposed, to intense white or blue (400–500 nm) light.