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Changes in the Reactivity of the Photosynthetic Apparatus in Heterotrophic Ageing Cultures of Scenedesmus obliquus
Author(s) -
KULANDAIVELU G.,
SENGER H.
Publication year - 1976
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1976.tb03929.x
Subject(s) - thylakoid , ultrastructure , photosynthesis , ageing , scenedesmus , chloroplast , scenedesmus obliquus , heterotroph , botany , thickening , starch , nutrient , biophysics , algae , cytoplasm , biology , chlorella , chemistry , biochemistry , ecology , bacteria , genetics , polymer science , gene
Ultrastructural changes of the chloroplast which occur parallel to the decay of photosynthetic capacity during the heterotrophic ageing of Scenedesmus cells have been studied. A gradual disappearance of the starch grains took place as the nutrients in the growth medium were depleted. Accompanying this change was a deterioration in the structure of the cytoplasm coupled with a concomitant granular appearance. At the same time thylakoid structures were not only well preserved but accumulated more material. This resulted in an increasing number of stacked thylakoids and a thickening of the membranes.