Combined use of companion planting and PGPR for the assisted phytoextraction of trace metals (Zn, Pb, Cd)

• Published in: Environmental science and pollution research international 2020-04, Vol.27 (12), p.13809-13825
• Main Authors: Konkolewska, Agnieszka, Piechalak, Aneta, Ciszewska, Liliana, Antos-Krzemińska, Nina, Skrzypczak, Tomasz, Hanć, Anetta, Sitko, Krzysztof, Małkowski, Eugeniusz, Barałkiewicz, Danuta, Małecka, Arleta
• Format: Article
• Language: English
• Subjects: Agricultural practices; Alfalfa; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Bacteria; Bioaccumulation; Biochemistry; Biodegradation, Environmental; Biological magnification; Biology; Biomass; Brassica; Cadmium; Cadmium - analysis; Earth and Environmental Science; Economic conditions; Ecotoxicology; Efficiency; Endophytes; Environment; Environmental Chemistry; Environmental Health; Environmental science; Flowers & plants; Inoculation; Intercropping; Laboratories; Lead; Metals; Metals, Heavy - analysis; Monoculture; Organs; Plant growth; Plant resistance; Plant roots; Plant tissues; Planting; Research Article; Soil; Soil contamination; Soil Pollutants - analysis; Soil pollution; Survival; Trace metals; Translocation; Waste Water Technology; Water Management; Water Pollution Control; Zinc; Zinc - analysis
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-020-07885-3

Biomass production and metal accumulation in plant tissue (bioconcentration) are two critical factors limiting the phytoextraction rate. Metal translocation to aboveground organs should be accounted for as the third most important factor, as harvesting of the plant roots is usually economically disadvantageous. These three parameters could be potentially increased with the use of companion planting, a well-known agricultural technique, and inoculation with plant growth–promoting bacteria (PGPB). The aim of the study was to determine whether intercropping and inoculation with endophytic PGPB ( Burkholderia phytofirmans PsJN T ) can increase the efficiency of phytoextraction of Zn, Pb, and Cd. The study was conducted on Brassica juncea (L.) Czern. “Małopolska” grown in a monoculture or co-planted with Zea mays L. “Codimon” and Medicago sativa L. “Sanditi.” Results show that companion planting and inoculation with rhizobacteria can increase the efficiency of metal phytoextraction, mainly by increasing the yield of dry biomass and the survival rate of plants grown on contaminated soil. We have shown that the simultaneous planting of B . juncea with M . sativa and inoculation with PGPB were the most efficient variants of assisted phytoextraction reaching a recovery of 95% Zn, 90% Cd, and on average about 160% Pb compared with control B . juncea plants grown in monoculture.