Importancia de la fuente nitrogenada y las PGPR en el crecimiento de plantas de Arabidopsis thaliana y Triticum aestivum expuestas al cadmio (Cd2+)
Cadmium induced toxicity in plants alters nitrogen (N) metabolism. Plant inoculation with plant growth promoting rhizobacteria (PGPR), as Azospirillum brasilense (Az) has been known to modulate abiotic stress response. The present work was aimed to study the response of Arabidopsis thaliana plants,...
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| Formato: | Tesis doctoral acceptedVersion |
| Lenguaje: | Español |
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Facultad de Farmacia y Bioquímica
2019
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| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_6023 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_6023.dir/6023.PDF |
| Aporte de: |
| Sumario: | Cadmium induced toxicity in plants alters nitrogen (N) metabolism. Plant inoculation with plant growth promoting rhizobacteria (PGPR), as Azospirillum brasilense (Az) has been known to modulate abiotic stress response. The present work was aimed to study the response of Arabidopsis thaliana plants, grown under different N sources and Triticum aestivum inoculated with Az, to Cd2+ stress. Also, parameters of the antioxidant defense system were measured in both species. A. thaliana plants watered with Ammonium containing solution, showed lower levels of Cd2+ in leaves. Inoculated wheat plants contained lower Cd2+ amounts in roots. However, the lower metal content in A .thaliana could not relieve the ammonium induced toxicity. Total iron content was increased in inoculated wheat plants and root length, nitric oxide content, nitrate reductase, catalase and guaiacol peroxidase activity were increased while proline was decreased in inoculated wheat roots. In this last species, total ammonium levels, superoxide radical and peroxide hydrogen were diminished in roots of inoculated plants. To summarize, this experimental model could not demonstrate the effect of the N source on the Cd2+ toxicity and the antioxidant defense response in A. thaliana but inoculation proved to be an efficient tool to moderate the metal toxicity. |
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