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HELICAL CHLOROPLASTS IN A STICHOCOCCUS‐TYPE ALGA 1
Author(s) -
Sorokin Constantine,
Corbett M. K.,
Nishino Shirley
Publication year - 1972
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.1529-8817.1972.tb04017.x
Subject(s) - chloroplast , biology , botany , biophysics , biochemistry , gene
SUMMARY Shape of the chloroplast in the green, rod‐shaped alga, isolated in our laboratory, depends on factors affecting cell growth. Under conditions of slow growth, the chloroplast is a simple plate‐like girdle characteristic of Stichococcus of the order Ulotrichales. Under conditions of rapid growth, the chloroplast, by extension, attenuation, and twisting, takes the shape of a helix resembling spiral chloroplasts of several genera of the order Zygnematales (or Conjuga(es). The attenuation and twisting of the chloroplast increase in the course of development of individual cells so that helical shape is most pronounced in mature cells approaching the division stage.