Symbiosis

, Volume 58, Issue 1–3, pp 149–159 | Cite as

Relationships between pasture legumes, rhizobacteria and nodule bacteria in heavy metal polluted mine waste of SW Sardinia

  • Vera I. Safronova
  • Giovanna Piluzza
  • Nadezhda Y. Zinovkina
  • Anastasiia K. Kimeklis
  • Andrey A. Belimov
  • Simonetta Bullitta
Article

Abstract

Local populations of the pasture legumes Astragalus hamosus, Lotus edulis, Lotus ornithopodioides, Medicago ciliaris and Scorpiurus muricatus from heavy metal polluted and unpolluted sites in Sardinia were compared for tolerance to Zn, Cd and Pb in hydroponics. Tolerance of plants to heavy metals varied significantly depending on the species, origin of the population and metal. The species L. edulis, L. ornithopodioides and M. ciliaris possessed higher metal tolerance and were used in a pot experiment with Zn, Cd and Pb polluted mine waste. Seeds were inoculated with the metal tolerant plant growth-promoting rhizobacterium Variovorax paradoxus 5C-2 or/and with the corresponding symbiotic nodule bacteria containing the enzyme 1-aminocyclopropane-1-carboxylate deaminase. Co-inoculation with the bacteria had synergistic and additive effects on nodule number, root growth and uptake of elements (N, P, Ca, Mg, Na, Mn, Zn and Pb) in shoots of L. edulis and L. ornithopodioides. Shoot biomass and uptake of K, Fe and Cd was increased by a combined inoculation of L. edulis. The ratio between shoot and root contents of Pb in L. ornithopodioides was above 1, suggesting a characteristic trait of hyperaccumulating species. The results suggest that the development of metal tolerant and efficient plant-bacteria systems might be useful for phytostabilization and revegetation of mine wastes.

Keywords

ACC deaminase Heavy metals PGPR Rhizobia Rhizosphere Phytoremediation 

Notes

Acknowledgments

This work was supported by the Italy-Russia Commission for Science and Technology Cooperation (T4 AGR 2001-2, 3N60AM7 2003-4), the Russian Foundation of Basic Research (02-04-4973-a, 06-04-49486-a, 09-04-01614-a) and the Ministry of Education and Science of Russian Federation (GK 16.552.11.7085). We are grateful to Filippo Virdis (DESA) and Mario Deroma (DIT) of Sassari University (I) and Maddalena Sassu (ISPAAM uos Sassari, I) for elemental analysis, Dr. E.P. Chizhevskaya for primer design of acdS genes and Prof. B.R. Glick for providing the strain R. hedysari Rhh.

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  • Vera I. Safronova
    • 1
  • Giovanna Piluzza
    • 2
  • Nadezhda Y. Zinovkina
    • 1
  • Anastasiia K. Kimeklis
    • 1
  • Andrey A. Belimov
    • 1
  • Simonetta Bullitta
    • 2
  1. 1.All-Russia Research Institute for Agricultural MicrobiologySaint-PetersburgRussian Federation
  2. 2.ISPAAM-CNR u.o.s. SassariLi Punti-SassariItaly

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