Mycorrhiza

, Volume 8, Issue 6, pp 329–334

Effects of Pseudomonas fluorescens DF57 on growth and P uptake of two arbuscular mycorrhizal fungi in symbiosis with cucumber

  • S. Ravnskov
  • Iver Jakobsen
ORIGINAL PAPER

DOI: 10.1007/s005720050254

Cite this article as:
Ravnskov, S. & Jakobsen, I. Mycorrhiza (1999) 8: 329. doi:10.1007/s005720050254

Abstract

 The effect of Pseudomonas fluorescens DF57 on growth and P uptake of two arbuscular mycorrhizal (AM) fungi in symbiosis with cucumber plants was studied in compartmentalised growth systems. Hyphae of Glomus intraradices Schenck & Smith (BEG87) or G. caledonium (Nicol. & Gerd.) Trappe & Gerdeman (BEG15) grew into lateral root-free compartments. Non-mycorrhizal plants served as control. The soil in half of the growth units of each mycorrhizal treatment was inoculated with P. fluorescens DF57. P. fluorescens DF57 enhanced hyphal length density of one of the AM fungi, G. caledonium, but this was not reflected in a higher hyphal transport of P from the root-free soil to the plant. The total P content was higher in plants grown in symbiosis with G. intraradices than in plants in the other treatments. G. caledonium and P. fluorescens DF57 had a synergistic effect in that total P content in plants inoculated with G. caledonium was higher in the presence than in the absence of P. fluorescens DF57.

Key words Arbuscular mycorrhizas Pseudomonas fluorescens Phosphorus transport 

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • S. Ravnskov
    • 1
  • Iver Jakobsen
    • 1
  1. 1.Risø National Laboratory, Plant Biology and Biogeochemistry Department, PBK-330, DK-4000 Roskilde, Denmark e-mail: Sabine.ravnskov@risoe.dk, Fax: +45-46-774-160DK

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