Abstract:
:Plants on contaminated mining soils often show a reduced growth due to nutrient depletion as well as trace elements (TEs) toxicity. Since those conditions threat plant's survival, plant growth-promoting rhizobacteria (PGPRs), such as rhizobia, might be of crucial importance for plant colonization on TE-contaminated soils. Native rhizobia from mining soils are promising candidates for bioaugmented phytoremediation of those soils as they are adapted to the specific conditions. In this work, rhizobia from Zn- and Cd-contaminated mining soils were in vitro screened for their PGP features [organic acids, indole-3-acetic acid (IAA), and siderophore (SID) production; 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity; and Ca3(PO4)2 solubilization] and Zn and Cd tolerance. In addition, some type and reference rhizobia strains were included in the study as well. The in vitro screening indicated that rhizobia and other native genera have great potential for phytoremediation purposes, by exerting, besides biological N2 fixation, other plant growth-promoting traits. Leucaena leucocephala-Mesorhizobium sp. (UFLA 01-765) showed multielement tolerance and an efficient symbiosis on contaminated soil, decreasing the activities of antioxidative enzymes in shoots. This symbiosis is a promising combination for phytostabilization.
journal_name
Int J Phytoremediationjournal_title
International journal of phytoremediationauthors
Rangel WM,Thijs S,Janssen J,Oliveira Longatti SM,Bonaldi DS,Ribeiro PR,Jambon I,Eevers N,Weyens N,Vangronsveld J,Moreira FMdoi
10.1080/15226514.2016.1207600subject
Has Abstractpub_date
2017-02-01 00:00:00pages
142-156issue
2eissn
1522-6514issn
1549-7879journal_volume
19pub_type
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