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Plant and Soil

, Volume 373, Issue 1–2, pp 569–582 | Cite as

Interaction between root growth allocation and mycorrhizal fungi in soil with patchy P distribution

  • Bernd Felderer
  • Jan Jansa
  • Rainer Schulin
Regular Article

Abstract

Aims and Background

Many plants preferentially grow roots into P-enriched soil patches, but little is known about how the presence of arbuscular mycorrhizal fungi (AMF) affects this response.

Methods

Lotus japonicus (L.) was grown in a low-P soil with (a) no additional P, (b) homogeneous P (28 mg pot−1), (c) low heterogeneous P (9.3 mg pot−1), and (d) high heterogeneous P (28 mg pot−1). Each P treatment was combined with one of three mycorrhiza treatments: no mycorrhizae, Glomus intraradices, indigenous AMF. Real-time PCR was used to assess the abundance of G. intraradices and the indigeneous AMF G. mosseae and G. claroideum.

Results

Mycorrhization and P fertilization strongly increased plant growth. Homogeneous P supply enhanced growth in both mycorrhizal treatments, while heterogeneous P fertilization increased biomass production only in treatments with indigenous AMF inoculation. Preferential root allocation into P-enriched soil was significant only in absence of AMF. The abundance of AMF species was similar in P-enriched and unfertilized soil patches.

Conclusion

Mycorrhization may completely override preferential root growth responses of plants to P- patchiness in soil. The advantage of this effect for the plants is to give roots more freedom to forage for other resources in demand for growth and to adapt to variable soil conditions.

Keywords

Preferential root growth Arbuscular mycorrhizal fungi Lotus japonicus Heterogeneous Phosphorus Root allocation 

Notes

Acknowledgments

The study was part of the Transregional Collaborative Research Centre 38 (Gerwin et al. 2009). Angela Erb conducted the qPCR analyses. We gratefully acknowledge financial support by the German Research Foundation (DFG) and the Ministry of Science, Research and Culture of Brandenburg (MWFK, Potsdam).

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  1. 1.Soil Protection Group, Institute of Terrestrial Ecosystems, ETH ZurichZurichSwitzerland
  2. 2.Institute of Microbiology, Academy of Sciences of the Czech RepublicPrahaCzech Republic

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