Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 27, Issue 12, Pages 13809-13825Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-020-07885-3
Keywords
Phytoextraction; Elements; Companion planting; Plant growth-promoting bacteria PGPR
Categories
Funding
- National Science Center in Poland [2017/01/X/ST4/00373, N N305 381138, 2013/11/N/NZ9/00070]
- program KNOW Poznan RNA Centre [01/KNOW2/2014]
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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. Malopolska 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.
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