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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/23817

Title: Leguminosae native nodulating bacteria from a gold mine As-contaminated soil: multi-resistance to trace elements, and possible role in plant growth and mineral nutrition.
Authors: Rangel, Wesley de M.
de Oliveira Longatti, Silvia M.
Ferreira, Paulo A. A.
Bonaldi, Daiane S.
Guimaraes, Amanda A.
Thijs, Sofie
Weyens, Nele
Vangronsveld, Jaco
Moreira, Fatima M. S.
Issue Date: 2017
Status: In Press
Abstract: Efficient N2-fixing Leguminosae nodulating bacteria resistant to As may facilitate plant growth on As-contaminated sites. In order to identify bacteria possessing these features, 24 strains were isolated from nodules of the trap species Crotalaria spectabilis (12) and Stizolobium aterrimum (12) growing on an As-contaminated gold mine site. 16S rRNA gene sequencing revealed that most of the strains belonged to the group of α-Proteobacteria, being representatives of the genera Bradyrhizobium, Rhizobium, Inquilinus, Labrys, Bosea, Starkeya and Methylobacterium. Strains of the first four genera showed symbiotic efficiency with their original host, and demonstrated in vitro specific plant growth promoting traits (production of organic acids, indole-3-acetic-acid and siderophores, 1-aminocyclopropane-1-carboxylate deaminase activity, and Ca3(PO4)2 solubilization), and increased resistance to As, Zn and Cd. In addition, these strains and some type and reference rhizobia strains exhibited a wide resistance spectrum to β-lactam antibiotics. Both, intrinsic plant-growth promoting abilities and multi-element resistance of rhizobia are promising for exploiting the symbiosis with different legume-plants on trace element contaminated soils.
Notes: Rangel, WDM (reprint author), Fed Univ Lavras UFLA, Biol Dept, Lavras, MG, Brazil.
URI: http://hdl.handle.net/1942/23817
DOI: 10.1080/15226514.2017.1303812
ISI #: 000416503500009
ISSN: 1522-6514
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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