Abstract
Specific inhibition of photosynthetic CO 2 fixation in Anacystis nidulans cells by d,l-glyceraldehyde resulted in the simultaneous inhibition of nitrate utilization, indicating a dependence of the latter process upon the provision of CO 2-fixation products. This dependence was lost in cells treated with l-methionine- d,l-sulfoximine or azaserine, effective inhibitors of ammonium assimilation. In these cells, nitrate uptake could proceed at rates similar to those in control cells even if CO 2 fixation was severely inhibited by d,l-glyceraldehyde. The results support the contention that CO 2-fixation products participate in the control of nitrate uptake in A. nidulans by preventing the accumulation of certain ammonium derivatives which are negative effectors of nitrate uptake.
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