Industrial practices are the primary causes for the accumulation of chromium in the environment, an element considered as a toxic heavy metal when present in high concentrations. The beneficial contribution of arbuscular mycorrhizal fungi (AMF) to plant nutrition and growth has been acknowledged, however, results of heavy metal uptake by plants under mycorrhizal symbiosis vary. The AMF Glomus intraradices (BEG 72) was used with Plantago lanceolata as a host plant in three experiments. In the first one, devised to assess the plant tolerance to Cr(III) in the soil, four levels of chromium concentration were applied in a sterile soil mix, placed in pots with inoculated and non inoculated plant treatments. Plant survival, shoot weight and AMF root colonisation were measured. In the second experiment which was designed in order to determine the effect of the symbiosis on the chromium uptake, similar treatments were used, and in addition, the heavy metal plant tissue content was measured and the bioconcentration factors calculated. In the third experiment the chromium uptake from an industrial chromium waste contaminated soil was assessed using treatments with and without the AMF. Results showed that chromium has a severe impact on the survival of non inoculated plants, however, plants inoculated with AMF in moderately contaminated soil, perform in terms of growth and survival rate, as well as the non inoculated plants in soil with no chromium added, suggesting a buffering effect of the AMF by decreased intake of the toxic element in the roots and its translocation to the shoot.Additional key words: Glomus intraradices, heavy metal tolerance, phytoremediation. ResumenEfecto de la contaminación del suelo con cromo en la colonización de las raíces con micorrizas arbusculares y en la absorción de metales pesados de Plantago lanceolata Prácticas industriales, tales como el cromado, el curtido de pieles, tratamientos de la madera y la minería, son las principales causas de la acumulación en el medio ambiente del cromo, un elemento considerado como metal pesado tóxico cuando está presente en grandes concentraciones. Se ha estudiado ampliamente la contribución de los hongos de la micorriza arbuscular (HMA) a la nutrición vegetal y al crecimiento de las plantas y se han descrito distintos efectos de la micorrización en la captación de metales pesados por las plantas. El HMA Glomus intraradices (BEG 72) fue utilizado con Plantago lanceolata como planta hospedante para evaluar la respuesta a la contaminación con Cr(III). Los ensayos se realizaron en suelo esterilizado al que se añadieron tres concentraciones de Cr(III) (100 mg kg -1 , 200 mg kg -1 , 400 mg kg -1 ) y en un suelo industrial contaminado con vertidos de cromo. Los resultados mostraron que la acumulación de cromo tiene graves repercusiones en la supervivencia de las plantas no micorrizadas, sin embargo, las plantas inoculadas con el HMA en un suelo moderadamente contaminado, tienen un crecimiento y una tasa de supervivencia comparables a los de las plantas n...
Arbuscular mycorrhizal fungi from two chromium contaminated sites, one with 275 mg kg-1 of Cr (zone A) and the other with 550 mg kg-1 Cr (zone B), were multiplied and tentatively identified. The effect of both fungal consortia on Plantago lanceolata plant growth in a substrate amended with 200 mg kg-1 of Cr and with 400 mg kg-1 Cr was assessed and compared with the growth of plants inoculated with Glomus intraradices BEG72. Only the plants inoculated with G. intraradices BEG72 and with the fungal consortia obtained from the area with a high Cr contamination (zone B) grew in the soil with 400 mg kg-1 of Cr. The consortia of fungi from zone B, decreased the plant’s uptake/translocation of the heavy metal compared with G. intraradices BEG72. These results underscore the differential effect of AM fungi in conferring bioprotection in Cr contaminated soils.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.