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LIGHT‐DEPENDENT MORPHOGENESIS OF UNICELLULAR STAGES IN SYNCHRONIZED CULTURES OF SCENEDESMUS QUADRICAUDA (TURP.) BRÉB. (CHLOROPHYCEAE)
Author(s) -
Steenbergen C. L. M.
Publication year - 1975
Publication title -
acta botanica neerlandica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0044-5983
DOI - 10.1111/j.1438-8677.1975.tb01029.x
Subject(s) - biology , cytokinesis , cell division , chlorophyceae , botany , morphogenesis , photoperiodism , darkness , microbiology and biotechnology , algae , cell , chlorophyta , biochemistry , gene
SUMMARY Cells of Scenedesmus quadricauda are synchronized by light‐dark cycles. During the photo‐period they build up the capacity to divide. First division into 2‐ and 4‐celled coenobia is induced, then during the second half of the photoperiod the induction of division into 8 unicells takes place. Division itself and the subsequent liberation of daughter cells occur in the dark period. By giving a definite photoperiod the formation of either coenobia or unicellular stages is determined. The formation of both coenobia and unicells is followed using a light microscope. In both cases only the pattern of cytokinesis is similar. After cytokinesis the unicells become ovoid in shape and form two spines at each pole. They are released from the parental wall as separate cells.