Loading...
4 results
Search Results
Now showing 1 - 4 of 4
- Zinc accumulation in Solanum Nigrum is enhanced by different arbuscular mycorrhizal fungiPublication . Marques, Ana P. G. C.; Oliveira, Rui S.; Rangel, António O.S.S.; Castro, Paula M.L.Solanum nigrum was found to proliferate in sediments with high levels of metal pollution. The effect of Zn on plant growth and tissue metal accumulation was assessed. The response of the plant to the inoculation with four different isolates of arbuscular mycorrhizal fungi (AMF) (Glomus sp. BEG140, Glomus claroideum, Glomus mosseae and Glomus intraradices) was studied. While the isolates of AMF did not have a significant (P < 0.05) influence on mycorrhizal colonisation, increasing Zn concentration to high levels (500 and 1000 mg kg 1) induced significant (P < 0.05) decrease of the AMF colonisation. In general, the presence of AMF did not affect the growth and biomass of S. nigrum individuals. However, the level of metal in the matrix affected S. nigrum growth; plants grown at 100 mg kg 1 had significantly (P < 0.05) lower leaf, stem, root and total biomass than control ones and plants growing at 500 and 1000 mg kg 1 had the significantly (P < 0.05) lowest biomass. Plants inoculated with the AMF G. claroideum and G. intraradices presented significantly (P < 0.05) higher Zn accumulation in all plant tissues. In general, the stem tissues had the higher Zn content while the leaves registered the lowest values, which indicate a high translocation of the metal. AMF inoculation had no significant (P < 0.05) influence on the metal translocation within the plant. This study suggests that inoculation with the AMF G. claroideum or G. intraradices, can enhance the Zn accumulation in the tissues of S. nigrum, not affecting the plant translocation capacities.
- Solanum nigrum grown in contaminated soil: effect of arbuscular mycorrhizal fungi on zinc accumulation and histolocalisationPublication . Marques, Ana P. G. C.; Oliveira, Rui S.; Samardjieva, Kalina A.; Pissarra, José; Rangel, António O. S. S.; Castro, Paula M.L.Zn tissue accumulation in Solanum nigrum grown in a non-contaminated and a naturally contaminated Zn matrix and the effect of inoculation with different arbuscular mycorrhizal fungi (AMF) on metal uptake were assessed. S. nigrum grown in the contaminated soil always presented higher Zn accumulation in the tissues, accumulating up to 1622 mg Zn kg 1. The presence of both Glomus claroideum and Glomus intraradices enhanced the uptake and accumulation of Zn by S. nigrum (up to 83 and 49% higher Zn accumulation, respectively). The main deposits of the metal were found in the intercellular spaces and in the cell walls of the root tissues, as revealed by autometallography, with the inoculation with different AMF species causing no differences in the location of Zn accumulation. These findings indicate that S. nigrum inoculated with selected heavy metal tolerant AMF presents extracting and accumulating capacities, constituting a potentially suitable remediation method for Zn polluted soils.
- Influence of plant components on the degradation of 4-nitrophenol by a bacterial consortium isolated from the rhizosphere of phragmites australisPublication . Oliveira, Rui S.; Zarzycki, Robert; Manaia, Célia M.; Castro, Paula M.L.The aim of this Work was to evaluate the influence of external parameters on the degradation of 4-nitrophenol by a bacterial consortium. The bacterial cconsortium, isolated by enrichment from the rhizosphere of phragmiles australis, was capable of utilising 4-NP as the sole carbone, and energy source. Degradation was studied under different conditions using resting cells. Among those, this influence of ascorbic acid and of plant extract obtained from P. australis was studies. Biodegradation of 4-NP was enhanced in the presence of these components. This work is part of a wider study on the use of phyto-microbial complexes to attenuated soil and water pollution.
- Survey of the heavy metal accumulation abilities of plant species indigenous to a metal polluted region in Portugal: metal uptake by plants and its relation with soil levels and mycorrhizal statusPublication . Moreira, Helena; Marques, Ana P. G. C.; Oliveira, Rui S.S.; Rangel, António O.S.S.; Castro, Paula M.L.