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Glyphosate effects on carbon assimilation and gas exchange in sugar beet leaves

, : Glyphosate effects on carbon assimilation and gas exchange in sugar beet leaves. Plant Physiology 85(2): 365-369

The mechanism responsible for the inhibition of net carbon exchange (NCE) which was reported previously (DR Geiger et al. 1986 Plant Physiol 82: 468-472) was investigated by applying glyphosate [N-(phosphonomethyl)glycine] to exporting leaves of sugar beet (Beta vulgaris L.). Leaf internal CO(2) concentration (C(i)) remained constant despite decreases in stomatal conductance and NCE following glyphosate treatment, indicating that the cause of the inhibition was a slowing of carbon assimilation rather than decreased conductance of CO(2). Throughout a range of CO(2) concentrations, NCE rate at a given C(i) declined gradually, with the time-series of response curves remaining parallel. Gas exchange measurements revealed that disruption of chloroplast carbon metabolism was an early and important factor in mediating these glyphosate effects, perhaps by slowing the rate of ribulose bisphosphate regeneration. An increase in the CO(2) compensation point accompanied the decrease in NCE and this increase was hastened by stepwise lowering of the ambient CO(2) concentration. Eventually the CO(2) compensation point approached the CO(2) level of air and the difference between internal and external CO(2) concentrations decreased. In control and in glyphosate-treated plants, both carbon assimilation and photorespiration at atmospheric CO(2) level were inhibited to a similar extent of air level of O(2). Maintaining leaves in low O(2) concentration did not prevent the decline in NCE rate.

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Accession: 001604148

PMID: 16665703

DOI: 10.1104/pp.85.2.365

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Grana E.; Barbieri A.; Zonta F.; Lucchelli A., 1991: Potentiating actions of tranylcypromine and moclobemide on the sympathomimetic activity of dopamine. Ex vivo investigations were carried out to study the potentiating actions of the MAOIs moclobemide and tranylcypromine on peripheral .alpha.- and .beta.-adrenergic effects of dopamine. Isolated rat vas deferens and atria were used. Preliminary exp...

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Smith, S.E.; Gottfried, J.A.; Chen, J.C.; Chesler, M., 1994: Calcium dependence of glutamate receptor-evoked alkaline shifts in hippocampus. Glutamate receptor activation induces an extracellular alkalinization in rodent hippocampus. We studied its Ca2+ dependence and pharmacology in hippocampal slices. Glutamate-evoked alkaline shifts were blocked by 0 Ca2+ saline. Alkalinizations ind...

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Wagner, Edward, 1955: Three new species of Phytocoris from Turkey and Syria Descriptions of Phytocoris pseudinsignis and P phrygicus from Turkey, and P seidenstuckeri from both Turkey and Syria Comparative notes on related spp are included R W Pennak. Istanbul Univ Fen Fak Mecmuasi Ser B Sci Nat: 161-168