Search results for "glufosinate"
showing 4 items of 14 documents
Caractérisation biochimique, physiologique et moléculaire de différents génotypes de Medicago truncatula
2017
Engineering school; Des études de l’interaction entre la légumineuse modèle Medicago truncatula (Mt) avec l’oomycète Aphanomyces euteiches (Ae) ont montré que la glutamine accumulée dans les racines infectées pourrait être un marqueur de sensibilité à ce pathogène végétal. Pour mieux comprendre le rôle de la glutamine dans la résistance de Mt à Ae,nous avons essayé de doser la glutamine racinaire avec un kit de dosage. D’autre part, nous avons analysé l’impact d’une dose sublétale d’un inhibiteur de la glutamine synthétase (enzyme responsable de la synthèse de glutamine chez les plantes) sur le développement de différents génotypes de Mt. Enfin nous nous sommes intéressés à lacapacité de Mt…
The Effect of Phosphinothricin (Glufosinate) on Glutathione Synthesis in Plants
1990
The inhibitory effect of DL-phosphinothricin (glufosinate) on glutathione synthesis was studied in vivo and in vitro. The influence of phosphinothricin on γ-glutamylcysteine synthetase was compared with the already known effects of l-buthionine sulfoximine and l-methionine sulfoximine. The results showed that phosphinothricin and buthionine sulfoximine are inhibitors of γ-glutamylcysteine synthetase of plants. With both substances the enzyme was inhibited by 50 % at a concentration of 7 . 10−4M (pI50 = 3.15). Methionine sulfoximine reduced the enzyme activity by 50% at 5 . 10−2 M (pI50 = 1.30). It is discussed that the target enzyme of phosphinothricin is the glutamine synthetase whereas th…
Effect of Glufosinate (Phosphinothricin) and Inhibitors of Photorespiration on Photosynthesis and Ribulose-1,5-Bisphosphate Carboxylase Activity
1992
Summary Glufosinate (phosphinothricin) irreversibly inhibits glutamine synthetase and leads to a great decrease in the amino acids glutamine, glutamate, aspartate, serine, glycine and alanine. Due to the lack of glutamate and serine, the transamination of glyoxylate into glycine in the course of photorespiration cannot take place. The inhibition of this part of the photorespiratory process plays the essential role with respect to the photosynthesis inhibition caused by PPT under atmospheric conditions. After addition of different photorespiration or Calvin cycle intermediates to phosphinothricin no decrease in photosynthesis inhibition can be measured. This suggests that photosynthesis inhi…
Inhibitory Action of Glufosinate on Photosynthesis
1993
Glufosinate (phosphinothricin) irreversibly blocks the glutamine synthetase which subsequently gives rise to an accumulation of ammonium and to a strong decrease in some amino acids, especially glutamine and glutamate. Under atmospheric conditions (400 ppm CO2, 21% O2) glufosinate causes a rapid inhibition of photosynthesis, too. H ow ever, under non-photo respiratory conditions (1000 ppm CO2, 2% O2) only a slight inhibition of photosynthesis occurs with glufosinate. Since under both conditions an accumulation of ammonium occurs, it is concluded that inhibition of photosynthesis is not induced by the higher concentrations of ammonium. The results rather suggest that the absence of amino don…