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Plant and Soil

, Volume 321, Issue 1–2, pp 153–187 | Cite as

Plant root growth, architecture and function

  • Angela Hodge
  • Graziella Berta
  • Claude Doussan
  • Francisco Merchan
  • Martin Crespi
Review Article

Abstract

Without roots there would be no rhizosphere and no rhizodeposition to fuel microbial activity. Although micro-organisms may view roots merely as a source of carbon supply this belies the fascinating complexity and diversity of root systems that occurs despite their common function. Here, we examine the physiological and genetic determinants of root growth and the complex, yet varied and flexible, root architecture that results. The main functions of root systems are also explored including how roots cope with nutrient acquisition from the heterogeneous soil environment and their ability to form mutualistic associations with key soil micro-organisms (such as nitrogen fixing bacteria and mycorrhizal fungi) to aid them in their quest for nutrients. Finally, some key biotic and abiotic constraints on root development and function in the soil environment are examined and some of the adaptations roots have evolved to counter such stresses discussed.

Keywords

Root systems Auxin Root architecture Soil heterogeneity Abiotic and biotic stresses Soil micro-organisms (including nitrogen-fixing bacteria and mycorrhizal fungi) 

Notes

Acknowledgements

AH thanks Alastair Fitter, Anna Armstrong and Deirdre Rooney for comments on the ‘Root Function’ and ‘Root Response to Abiotic Stress’ sections. We also thank three anonymous referees for their comments which helped greatly improve the manuscript.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Angela Hodge
    • 1
  • Graziella Berta
    • 2
  • Claude Doussan
    • 3
  • Francisco Merchan
    • 4
  • Martin Crespi
    • 5
  1. 1.Department of BiologyUniversity of York, YorkUK
  2. 2.Dipartimento di Scienze dell’Ambiente e della VitaUniversità del Piemonte OrientaleAlessandriaItaly
  3. 3.UMR 1114 EMMAH INRA/UAPV Domaine Saint-PaulAvignon Cedex 9France
  4. 4.Departamento de Microbiología y Parasitología, Facultad de FarmaciaUniversidad de SevillaSevillaEspaña
  5. 5.Institut des Sciences du Végétal (ISV)CNRSGif-sur-YvetteFrance

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