Response of Arabidopsis thaliana, seedlings to cadmium in relation to ammonium availability.
This study explored the natural variability of Arabidopsis thaliana to find out its response to ammonium availability and characterize the tolerance capacity to cadmic stress under low, average or high nitrogen supplies. Growth was determined by different morphological traits and metabolic enzymes. Plant growth was inhibited by cadmium at low nitrogen regime. But, at average or high nitrogen conditions, plant growth seems to be no affected by cadmium. Cadmium inhibited glutamine synthetase activity and stimulated glutamate dehydrogenase one in order to tolerate cadmium stress. Cadmium enhanced proline and sugar tenor in average or high nitrogen plants parallel with activation of Rubisco. Observations show that cadmium-induced stress was alleviated by optimal ammonium availability.
Unité de Recherche Nutrition et métabolisme azotés et protéines de stress, 99UR/09-20, Département de Biologie, Faculté des Sciences de Tunis, Universitaire de Tunis El Manar, 1060 Tunis, Tunisia. hajajiafef@yahoo.fr
Nasraoui Hajaji
NH
Afef
Gouia
G
Houda
Chaffei Haouari
CH
Chiraz
D017360:Arabidopsis / Q000187:drug effects / Q000502:physiology*; D002104:Cadmium / Q000032:analysis / Q000633:toxicity*; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000032:analysis / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects / Q000502:physiology*; D012989:Soil Pollutants / Q000032:analysis / Q000633:toxicity*
D000644:Quaternary Ammonium Compounds; D012989:Soil Pollutants; D002104:Cadmium; D005969:Glutamate Dehydrogenase