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TAXONOMIC SIGNIFICANCE OF NUCLEUS‐MICROBODY ASSOCIATIONS, SEGREGATED NUCLEOLI AND OTHER NUCLEAR FEATURES IN SIPHONOUS GREEN ALGAE 1
Author(s) -
Roth William C.,
Friedmann E. Imre
Publication year - 1980
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.1529-8817.1980.tb03060.x
Subject(s) - nucleolus , biology , algae , microbody , green algae , nucleus , ribosomal rna , cell nucleus , botany , rna , microbiology and biotechnology , genetics , gene , peroxisome
On the basis of fine‐structural features of nuclei the “true” siphonous green algae (Eusiphoniidae) are divided into three groups. In the Codium group nuclei are generally similar to those in most other algae. The Penicillus group is characterized by the association of microbodies with nuclei. In the Avrainvillea group nucleoli are segregated into a granular and a fibrillar component. This condition, known as macrosegregation, persists throughout the vegetative phase of the life history and may indicate a peculiar ribosomal RNA cycle. The Penicillus group corresponds to the order Caulerpales Feldmann. Avrainvillea and Cladocephalus probably constitute a new order. Blastophysa, although having a type of segregated nucleoli, is probably more closely related to Siphonocladales than to any order in Eusiphoniidae.