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Biology and Fertility of Soils

, Volume 45, Issue 4, pp 405–413 | Cite as

Salt tolerance in Zea mays (L). following inoculation with Rhizobium and Pseudomonas

  • Asghari Bano
  • Mussarat Fatima
Original Paper

Abstract

This study aimed to investigate the effect of inoculation with plant growth-promoting Rhizobium and Pseudomonas species on NaCl-affected maize. Two cultivars of maize (cv. Agaiti 2002 and cv. Av 4001) selected on the basis of their yield potential were grown in pots outdoors under natural conditions during July. Microorganisms were applied at seedling stage and salt stress was induced 21 days after sowing and maintained up to 50% flowering after 120 days of stress. The salt treatment caused a detrimental effect on growth and development of plants. Co-inoculation resulted in some positive adaptative responses of maize plants under salinity. The salt tolerance from inoculation was generally mediated by decreases in electrolyte leakage and in osmotic potential, an increase in osmoregulant (proline) production, maintenance of relative water content of leaves, and selective uptake of K ions. Generally, the microbial strain acted synergistically. However, under unstressed conditions, Rhizobium was more effective than Pseudomonas but under salt stress the favorable effect was observed even if some exceptions were also observed. The maize cv. Agaiti 2002 appeared to be more responsive to inoculation and was relatively less tolerant to salt compared to that of cv. Av 4001.

Keywords

Inoculation Salinity Rhizobium Zea mays L. 

Notes

Acknowledgement

The authors express their deep senses of gratitude to Prof Dr. Paolo Nannipieri, Editor-in-Chief, Biology and Fertility of Soils, for his comments, valuable suggestion, and editing of this manuscript.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Department of Plant ScienceQuad-i-Azam UniversityIslamabadPakistan

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