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EFFECTS OF CO 2 CONCENTRATION DURING GROWTH ON THE INTRACELLULAR STRUCTURE OF CHLORELLA AND SCENEDESMUS (CHLOROPHYTA) 1
Author(s) -
Miyachi Shigetoh,
Tsuzuki Mikio,
Maruyama Isao,
Gantar Miroslav,
Miyachi Shizuko,
Matsushima Hisashi
Publication year - 1986
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.1529-8817.1986.tb00029.x
Subject(s) - pyrenoid , chlorophyta , chloroplast , biology , chlorella pyrenoidosa , chlorella vulgaris , botany , starch , lamellar structure , chlorophyceae , scenedesmus , biophysics , algae , biochemistry , chlorella , crystallography , chemistry , gene
Effects of CO 2 concentration during growth on intracellular structure were studied with ftve species of Chlorella and Scenedesmus obliquus. Cells grown under ordinary air conditions (low‐CO 2 cells) had a well developed pyrenoid surrounded by starch, while those grown under high CO 2 conditions (high‐CO 2 cells) had a less developed pyrenoid or no detectable pyrenoid. Two mitochondria, one at each side of the neck of the projection of the chloroplast close to the pyrenoid, were found in low CO 2 cells of C. vulgaris 11h. Usually, lamellar stacks extended in parallel in the chloroplast of low‐CO 2 cells of C. vulgaris 11h, while a grana‐like structure was found in high‐CO 2 cells. However, in C. pyrenoidosa, grana like structures were found more commonly in low‐CO 2 cells than in high‐CO 2 cells. These results suggest that development of pyrenoid starch is generally correlated with growth under low CO 2 conditions, whereas CO 2 ‐effects on lamellar stacking are species dependent.