Plant and Soil

, Volume 110, Issue 2, pp 157–165 | Cite as

Mechanisms of infection of plants by nitrogen fixing organisms

  • J. I. Sprent
  • S. M. de Faria

Abstract

Heterotrophic nitrogen-fixing microorganisms can enter plants via wounds, root hairs or intact epidermises. All at some stage need the ability to digest primary cell walls and/or middle lamellas. None appears to digest secondary walls. The ability of any organism to infect a particular plant reflects (a) the enzymes produced by the microorganism (and possibly, as part of its reaction, the plant); (b) the exact nature of the primary wall; (c) the distribution of secondary walls. Plants may respond to infection by hypersensitive and other reactions which could be triggered by production of cell wall fragments. Infection threads of secondary wall material may be essential for root hair infection and where cell boundaries are crossed. Entry into host cells other than by infection threads involves a delicate balance between endophyte and host. This may only be achieved in one or a few cells, which may then divide repeatedly to produce a symbiotic structure.

Key words

cell wall Frankia infection legume non-legume Rhizobium 

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Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • J. I. Sprent
    • 1
  • S. M. de Faria
    • 1
  1. 1.Department of Biological SciencesUniversity of DundeeDundeeUK

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