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Interrelationships between carbohydrate metabolism and nitrogen assimilation in cultured plant cells : II. The effect of the nitrogen source and concentration on nutrient uptake and respiratory activity in cultured sycamore cells


Interrelationships between carbohydrate metabolism and nitrogen assimilation in cultured plant cells : II. The effect of the nitrogen source and concentration on nutrient uptake and respiratory activity in cultured sycamore cells



Planta 132(2): 125-129



ISSN/ISBN: 0032-0935

PMID: 24424989

DOI: 10.2307/23372331

The effect of the nature and concentration of the nitrogen source on respiratory activity and removal of carbohydrate from the medium in suspension cultured sycamore (Acer pseudoplatanus L.) cells was determined. Comparison was also made of the rates of uptake of the two alternative nitrogen sources, nitrate and glutamate, at differing initial nitrogen concentrations within the range 7-14 mM. The initial pH of the culture medium before inoculation was 5.2; after inoculation the pH of both nitrate and glutamate cultures rose to reach an eventual level in the range 7.0-7.1. Glutamate was removed from the medium more slowly than nitrate. Under the particular conditions of culture used the growth of the cells was nitrogen limited. Sugar uptake from the medium continued for some time after the nitrogen in the medium was depleted. The data show that although cell division and protein content are nitrogen-limited, dry weight and fresh weight yields may also be determined in a complex interaction through carbohydrate availability. There were no obvious differences in respiratory activity between cultures grown on nitrate or glutamate.

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Accession: 016174042

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