Abstract
Background and Aims
Plants growing on serpentine bedrock have to cope with the unique soil chemistry and often also low water-holding capacity. As plant-soil interactions are substantially modified by arbuscular mycorrhizal (AM) symbiosis, we hypothesise that drought tolerance of serpentine plants is enhanced by AM fungi (AMF).
Methods
We conducted a pot experiment combining four levels of drought stress and three AMF inoculation treatments, using serpentine Knautia arvensis (Dipsacaceae) plants as a model.
Results
AMF inoculation improved plant growth and increased phosphorus uptake. The diminishing water supply caused a gradual decrease in plant growth, accompanied by increasing concentrations of drought stress markers (proline, abscisic acid) in root tissues. Mycorrhizal growth dependence and phosphorus uptake benefit increased with drought intensity, and the alleviating effect of AMF on plant drought stress was also indicated by lower proline accumulation.
Conclusions
We documented the role of AM symbiosis in plant drought tolerance under serpentine conditions. However, the potential of AMF to alleviate drought stress was limited beyond a certain threshold, as indicated by a steep decline in mycorrhizal growth dependence and phosphorus uptake benefit and a concomitant rise in proline concentrations in the roots of mycorrhizal plants at the highest drought intensity.
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Acknowledgments
The financial support of the Grant Agency of the Academy of Sciences of the Czech Republic (project KJB600050812) and the Grant Agency of Charles University in Prague (project 271011) is gratefully acknowledged. Additionally, this study was also supported by a long-term research development project no. RVO 67985939 (Academy of Sciences of the Czech Republic), by Charles University in Prague (project SVV 265203/2012), and by the Ministry of Agriculture of the Czech Republic (0002700604). The authors would also like to thank M. Albrechtová and her team at the Analytical laboratory of the Institute of Botany AS CR for their chemical analyses of plant biomass and soils, as well as T. Hájek (Institute of Botany AS CR, Třeboň) for the provision of and advice regarding the LI-COR, portable photosynthesis system. Thanks are also due to Prof. F. Asch and his team from the Institute for Plant Production and Agroecology in the Tropics and Subtropics at University of Hohenheim for providing the conjugate for ABA analysis. The advices of Z. Sýkorová and P. Kohout on AMF molecular determination, the support of members of the DNA laboratory of the Institute of Botany AS CR as well as the valuable comments of the editor and reviewers of the previous version of the manuscript are greatly appreciated.
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Doubková, P., Vlasáková, E. & Sudová, R. Arbuscular mycorrhizal symbiosis alleviates drought stress imposed on Knautia arvensis plants in serpentine soil. Plant Soil 370, 149–161 (2013). https://doi.org/10.1007/s11104-013-1610-7
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DOI: https://doi.org/10.1007/s11104-013-1610-7