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Effects of different organic materials and mineral nutrients on arbuscular mycorrhizal fungal growth in a Mediterranean saline dryland

Author:
  • Edith Hammer
  • Hafedh Nasr
  • Håkan Wallander
Publishing year: 2011
Language: English
Pages: 2332-2337
Publication/Series: Soil Biology & Biochemistry
Volume: 43
Issue: 11
Document type: Journal article
Publisher: Elsevier

Abstract english

Arbuscular mycorrhizal (AM) fungi are root symbionts that enhance plant growth and improve soil fertility and soil structure in drylands. Even though AM fungi are obligate biotrophs, organic matter (OM) can stimulate their growth, but the mechanisms behind this are still unknown. Here, we compared the effect of nutrient patches of different OM sources to intrinsic components of OM such as inorganic nutrient supply and an improved soil water-holding capacity (WHC; via application of hydrophilic polymers), on AM fungal growth. Fatty acids extracted from in-growth mesh bags incubated in the field were used as biomarkers for AM fungi and other soil microbes. We found an enhancement of AM fungal growth in certain nutrient patches. Two out of three OM types stimulated AM fungal growth strongly, and also the addition of inorganic nutrients enhanced AM fungi, though to a lesser extent than OM. Enhanced soil WHC, on the other hand, did not influence AM fungal growth. AMF were more strongly enhanced by the mineral nutrients relative to other soil organisms. Intrinsic nutrients might be an important factor for AMF growth stimulation in OM additions, but there was no evidence that nutrients alone can explain this phenomenon. (C) 2011 Elsevier Ltd. All rights reserved.

Keywords

  • Biological Sciences
  • Organic matter
  • AMF
  • PLFA
  • NLFA
  • Mesh bags
  • Arid
  • Fertilizer
  • Nutrient
  • patch
  • Foraging
  • Tunisia

Other

Published
  • Microbial Ecology
  • ISSN: 0038-0717
Edith Hammer
E-mail: edith [dot] hammer [at] biol [dot] lu [dot] se

Associate senior lecturer

MEMEG

+46 46 222 45 36

+46 73 244 19 68

E-F213

Sölvegatan 37, Lund

50

Research group

Microbial Ecology

Projects

MICCS

PhD students and postdocs

PhD students, main supervisor

Carlos Arellano

Postdocs

Kristin Aleklett