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Effects of the glutamine synthetase inhibitor methionine sulfoximine on CO2 fixation inLemna gibba

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Summary

Net CO2 fixation inLemna gibba L. was inhibited by 0.5 mM L-methionine D,L-sulfoximine (MSX) both under photorespiratory conditions (21% O2) and in 2% O2. The inhibition was noticeably delayed by addition of 5 mM glutamine. Glutamine also delayed MSX-induced inactivation of glutamine synthetase. An increase in intracellular NH +4 concentration was noted in the presence of MSX only, and in the presence of 10 mM NH +4 only. However, presence of 10 mM NH +4 did not cause any inhibition of CO2 fixation.

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Authors and Affiliations

  1. Department of Botany, University of Stockholm, S-106 91, Stockholm, Sweden

    L. Johansson & C. -M. Larsson

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  1. L. Johansson
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  2. C. -M. Larsson
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Johansson, L., Larsson, C.M. Effects of the glutamine synthetase inhibitor methionine sulfoximine on CO2 fixation inLemna gibba . Plant Soil 91, 373–376 (1986). https://doi.org/10.1007/BF02198126

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