Effect of methionine-sulfoximine on nitrate uptake and photosynthesis in the cyanobacteriumAnabaena doliolum Bharadwaja |
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| Authors: | Durg Vijai Singh Professor Har Darshan Kumar |
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| Affiliation: | (1) Botany Department, Banaras Hindu University, Post Box 14, 221005 Varanasi, India |
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| Abstract: | l-Methionine-dl-sulfoximine (MSX) stimulated nitrate uptake but inhibited14CO2 fixation and O2 evolution inAnabaena doliolum. Nitrate uptake was inhibited by ammonium (NH4+) in the absence of MSX, but not in the presence of MSX. Glutamine or a derivative of it appears to be the actual negative effector of nitrate utilization. In presence of nitrate, MSX-treated cells ofA. doliolum evolve more O2 than do untreated cells. Our results suggest a close relation between photoassimilation of carbon and utilization of nitrogen. |
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