The effect of exogenous ammonium on O2 evolution and structural organization of cells in mixotrophic callus of soybean (Glycine max L.). Chlorophyll content increased in the presence of ammonium in nutrient medium. Under these conditions, the rate of photosynthetic O2 evolution per unit biomass increased; however, the photosynthetic rate decreased when calculated per unit of chlorophyll content. The presence of ammonium in nutrient medium favored the formation of the protein-synthesizing machinery in cells, which manifested itself in an increase of the number of ribosomes, and directly enhanced protein synthesis, as follows from the expansion of chloroplast membrane systems and greater electron density of mitochondrial matrix and cytoplasm of mixotrophic cells. Possible sites of ammonium participation in the formation of the functional structure in plant cells are discussed.
Russian Journal of Plant Physiology – Springer Journals
Published: Dec 22, 2004
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