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EFFECTS OF DARKNESS AND OF STREPTOMYCIN ON THE FINE STRUCTURE OF EUGLENA GRACILIS
Author(s) -
Siegesmund Kenneth A.,
Rosen Walter G.,
Gawlik Stanley R.
Publication year - 1962
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1962.tb14919.x
Subject(s) - euglena gracilis , pyrenoid , biology , chloroplast , darkness , euglena , botany , streptomycin , electron micrographs , biophysics , electron microscope , biochemistry , optics , gene , physics , antibiotics
S iegesmund , K enneth A., W alter G. R osen , and S tanley R. G awlik . (Marquette (J., Milwaukee, Wis.) Effects of darkness and of streptomycin on the fine structure of Euglena gracilis. Amer. Jour. Bot. 49 (2) : 137–145. Illus. 1962.—Dark‐grown Euglena gracilis cells, transferred from streptomycin (SM)‐containing medium to SM‐free medium 5 days before transfer to light, turn green normally, indicating that proplastids are unaffected by SM. SM‐bleached cells, grown in light, contain numerous bodies composed of concentric lamellae (CL bodies). These differ from chloroplasts in that their lamellae lack electron‐dense dots, are not coalesced, and they lack a 3‐layered limiting membrane and pyrenoids. CL bodies are absent from dark‐grown normal and dark‐grown SM‐bleached cells, as well as from light‐grown normal cells. It is suggested that CL bodies result from a derangement of chloroplast synthesis caused by SM blockage of chlorophyll synthesis.