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KARYOLOGICAL STUDIES OF THREE SPECIES OF SCYTOSIPHONACEAE (PHAEOPHYTA) FROM COASTAL NORTH CAROLINA 1
Author(s) -
Kapraun Donald F.,
Boone Paul W.
Publication year - 1987
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.1529-8817.1987.tb04140.x
Subject(s) - biology , mitosis , botany , chromosome , cytokinesis , taxon , chromosome number , zoology , karyotype , cell division , genetics , gene , cell
Chromosome numbers for three species of Scytosiphonaceae from the warm temperate coast of North Carolina are presented. Petalonia fascia (O. F. Mueller) Kuntze, P. zosterifolia (Reinke) Kuntze, and Scytosiphon lomentaria (Lyngbye) C. Agardh were all found to have twenty‐two chromosomes in both macro‐ and microthallus stages. The uniformity of chromosome numbers and morphology for all three taxa suggest a close genetic relationship and possible common ancestry. Evidence of synchronous mitotic divisions is presented for the first time in the Phaeophyta. Both field collected and culture material of P. fascia and P. zosterifolia exhibited a 2–4 h post‐sunset peak in nuclear divisions. In actively growing macrothalli, up to 8% of the observed cells were found in some stage of mitosis. Data suggest that mitosis and the entire sequence of cytokinesis require approximately 2 h.