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Regulatory coupling of nitrate and sulfate assimilation pathways in cultured tobacco nicotiana tabacum cultivar xanthi cells


Proceedings of the National Academy of Sciences of the United States of America 77(11): 6670-6672
Regulatory coupling of nitrate and sulfate assimilation pathways in cultured tobacco nicotiana tabacum cultivar xanthi cells
When cultured tobacco cells are provided growth-limiting concentrations of S as sulfate, the rate of development of nitrate reductase (NADH:nitrate oxidoreductase, EC 1.6.6.1) is proportional to the initial sulfate concentration. When the cells are provided growth-limiting concentrations of N as nitrate, the rate of derepression of ATP sulfurylase (ATP:sulfate adenylyltransferase, EC 2.7.7.4) is proportional to the initial nitrate concentration. These results indicate a reciprocal regulatory coupling between the nitrate and sulfate assimilation pathways.

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Accession: 006292001



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