ESTABLISHMENT AND PHYSIOLOGICAL RESPONSES OF THE RHIZOBIUM TROPICI-LEUCAENA LEUCOCEPHALA SYMBIOSIS IN PRESENCE OF PHENANTHRENE AND NAPHTALENE
This study evaluated the establishment of the symbiosis between Rhizobium tropici CIAT899 and Leucaena leucocephala (Lam.) under contaminated systems with naph- talene (NAF) and phenanthrene (FEN), as well as the physiological plantas responsessuch as total content of phenolic compounds (CFT), total...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/31935 |
| Acceso en línea: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/31935 |
| Access Level: | acceso abierto |
| Palabra clave: | nodulation PAH phytoxicity total antioxidants phenolics chloroplyll nodulación HPA fitotoxicidad antioxidantes totales fenólicos clorofilas |
| Sumario: | This study evaluated the establishment of the symbiosis between Rhizobium tropici CIAT899 and Leucaena leucocephala (Lam.) under contaminated systems with naph- talene (NAF) and phenanthrene (FEN), as well as the physiological plantas responsessuch as total content of phenolic compounds (CFT), total antioxidant activity (AAT) and the content of chlorophylls (CloroT) and carotenoids (CaT). After 31 days, NAF had more significant negative effects on nodulation by delaying the formation of nodules until the day 25 at 100 mg/L. In the presence of 20 mg FEN/L, L. leucocephala plants did not show significant differences on the number of nodules when compared to the control, while nodulation decreased 52 % at 60 and 100 mg FEN/L. Inoculation with R. tropici resulted in significant increases of PST (>150 %) in comparison to non-inoculated plants. The foliar content of CFT was significantly greater at non-inoculated treatments in respect to those with R. tropici, and significantly higher in plants exposed to FEN than NAF. For both hydrocarbons, the concentration of 100 mg/L resulted in greater CFT and AAT when compared to 20 or 60 mg/L. For roots, treatments without contamination and R. tropici had more content of CFT and AAT. The AAT in nodules significantly increased due to NAF, while a significant reduction was observed in FEN treatments. Either NAF or FEN did not significantly affect the content of CloroT, although this content was significantly greater in plants with R. tropici than non-inoculated plants. The CaT content significantly increased at non-inoculated plants exposed to NAF and/or FEN. |
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