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OtherBIOCHEMISTRY AND ENZYMOLOGY
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Diauxic Growth in Rice Suspension Cells Grown on Mixed Carbon Sources of Acetate and Glucose

T. K. Lee, W. S. Lee
T. K. Lee
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W. S. Lee
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Published February 1996. DOI: https://doi.org/10.1104/pp.110.2.465

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Abstract

Diauxic growth was observed in rice (Oryza sativa L.) suspension cells growing on acetate (10 mM) and glucose (10 mM). Cells used acetate during the first growth phase and the acetate level in the medium was rapidly decreased, whereas the level of glucose remained essentially unchanged. After acetate was depleted from the medium, cells started to use glucose, forming the second growth phase. It appears that uptake of [14C]glucose was repressed during the first growth phase and became active during the second growth phase. In contrast, uptake of [14C]acetate occurred actively throughout the diauxic growth. By further demonstrating the specific induction of isocitrate lyase (EC 4.1.3.1), a glyoxylate cycle enzyme, and hexokinase (EC 2.7.1.1), a glycolysis enzyme, during the first and second growth phases, respectively, it was clearly shown that rice cells use acetate first and do not use both carbon sources simultaneously. This kind of diauxic growth pattern has been observed in bacteria. To our knowledege, this study is the first report demonstrating the presence of diauxic growth in plant cells.

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Diauxic Growth in Rice Suspension Cells Grown on Mixed Carbon Sources of Acetate and Glucose
T. K. Lee, W. S. Lee
Plant Physiology Feb 1996, 110 (2) 465-470; DOI: 10.1104/pp.110.2.465

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Diauxic Growth in Rice Suspension Cells Grown on Mixed Carbon Sources of Acetate and Glucose
T. K. Lee, W. S. Lee
Plant Physiology Feb 1996, 110 (2) 465-470; DOI: 10.1104/pp.110.2.465
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Plant Physiology
Vol. 110, Issue 2
Feb 1996
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More in this TOC Section

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  • The Superoxide Synthases of Rose Cells
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