Microbial Activity in the Rhizosphere

1. Front Matter

   Pages I-XVI

   PDF

2. Rhizosphere Biology – an Overview

   • Chakravarthula Manoharachary, Krishna G. Mukerji

   Pages 1-15

3. Methods and Techniques for Isolation, Enumeration and Characterization of Rhizosphere Microorganisms

   • Nandanavanam Ranganayaki, Kolluru V. B. R. Tilak, Chakravarthula Manoharachary, Krishna G. Mukerji

   Pages 17-38

4. Root Exudates as Determinant of Rhizospheric Microbial Biodiversity

   • Geeta Singh, Krishna G. Mukerji

   Pages 39-53

5. Rhizosphere Microbial Community Dynamics

   • Roopam Kapoor, Krishna G. Mukerji

   Pages 55-69

6. The Role of Rhizotrons and Minirhizotrons in Evaluating the Dynamics of Rhizoplane-Rhizosphere Microflora

   • Bobbie L. McMichael, John C. Zak

   Pages 71-87

7. Significance of Bacteria in the Rhizosphere

   • David B. Nehl, Oliver G. G. Knox

   Pages 89-119

8. Interactions Among Beneficial Microorganisms

   • Anil Kumar Saxena, Rasika Shende, Minakshi Grover

   Pages 121-137

9. Bacterial Community Composition and Activity in Rhizosphere of Roots Colonized by Arbuscular Mycorrhizal Fungi

   • Petra Marschner, Sari Timonen

   Pages 139-154

10. Mycorrhizosphere Concept

    • Sari Timonen, Petra Marschner

    Pages 155-172

11. Molecular Techniques for Understanding the Microbial Community Structure in Mycorrhizosphere

    • Pankaj Krishna, Mondem S. Reddy, Tulasi Satyanarayana

    Pages 173-198

12. Arbuscular Mycorrhizal Fungi and the Formand Functioning of the Root System

    • David Atkinson

    Pages 199-222

13. Fungal Recognition Responses to Host Derived Signals by Arbuscular Mycorrhizal Fungi

    • Cristiana Sbrana

    Pages 223-243

14. Interactions Between Ectomycorrhizal Fungi and Rhizospheric Microbes

    • Mondem S. Reddy, Tulasi Satyanarayana

    Pages 245-263

15. Role of Beneficial Microsymbionts on the Plant Performance and Plant Fitness

    • Borbala Biró, Krisztina Köves-Péchy, Merope Tsimilli-Michael, Reto J. Strasser

    Pages 265-296

16. Bacteria Helping Mycorrhiza Development

    • Robin Duponnois

    Pages 297-310

17. Rhizosphere Regulation of Preinfection Behavior of Oomycete Plant Pathogens

    • Eric B. Nelson

    Pages 311-343

18. Back Matter

    Pages 345-349

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The rhizosphere is a very complex environment in which the effects of the plant on soil microorganisms and the effects of the microorganisms on the plant are interacting and are interdependent. Plant root exudates and breakdownproducts attract microbes and feed them and, in turn, the plants often bene?t from the microbes. Interactions among microorg- ismsandplantrootsareessentialfornutritionalrequirementsoftheplant. Plant growth, development and productivity are largely dependent on the soil environment in the root region rhizosphere. The new techniques of studying the rhizosphere enables us to get a much better understanding of the dynamics of the rhizosphere population, such rhizosphere studies beingofinteresttoagriculturists,soilbiologists,chemists,microbiologists andmolecularbiologists. The rhizosphere microbes in?uence the root environment in several ways. They may change the oxidation-reduction potential, in?uence the availabilityofmoistureandnutrients,producegrowthinhibitingorgrowth promoting substances in the form of exudates, provide competition and possiblyinducemanyothereffects.Mycorrhizalassociationsarebene?cial in mineral uptake and in increasing root surface area for effective ion absorption. Antagonism,competitionandsynergisminsoilandtherhizoplane(r- zosphere) are the most important microbial interactions to consider in the study of rhizosphere biology. With the growing information on the production of growth regulators, competitiveness of the microbes in the rhizosphere, microsymbionts, and other factors, their effect upon plant growth will become more evident. Experiments on the introduction of microbes or their products in the rhizosphere will help to improve our understandingofthebiologyoftherhizosphere.

• Fitness
• Marsch
• arbuscular mycorrhizal fungi
• biodiversity
• environment
• microbe
• microbial communities
• microorganism
• mycorrhizosphere
• rhizotrons
• root exudates

• Department of Botany, University of Delhi, Delhi, India

  K. G. Mukerji

• Department of Botany, Osmania University, Hyderabad, India

  C. Manoharachary

• Environmental Building Solutions Ltd., Milton Keynes, United Kingdom

  Jagjit Singh

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