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Soil salinity delays germination and limits growth of hyphae from propagules of arbuscular mycorrhizal fungi

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Abstract

Colonisation of plant roots by some arbuscular mycorrhizal (AM) fungi is reduced in the presence of sodium chloride (NaCl), probably due to a direct effect of NaCl on the fungi. However, there appear to be differences between the fungi in their ability to colonise plants in the presence of NaCl. This experiment tested the hypothesis that propagules of different isolates and species of AM fungi from saline and nonsaline soils would differ in their ability to germinate and grow in the presence of NaCl in the soil solution. Spores or pieces of root colonised by a range of AM fungi were incubated between filters buried in soil to which NaCl had been added at concentrations of 0, 150 or 300 mM in the soil solution. At regular intervals, filters were removed from the soil and both the percentage of propagules which had germinated and the length of proliferating hyphae were determined. Germination of spores of AM fungi studied was delayed in the presence of NaCl, but the fungi differed in the extent to which germination was inhibited. Two isolates of Scutellospora calospora reached maximum germination in 300 mM NaCl, but neither of two isolates of Acaulospora laevis germinated in the presence of NaCl. Germination of spores of the other fungi, including some isolated from saline soil, fell between these extremes. For some fungi, the specific rate of hyphal extension was reduced by NaCl. For others, the specific rate of growth was similar in the presence of NaCl to that in the control treatment, but overall production of hyphae was reduced in the NaCl treatments because germination was reduced.

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Acknowledgements

Support for this research was provided by the Government of Australia through provision of an Australian Postgraduate Research Award to S. Juniper. We thank C. Gazey, J. Davey, S. Mercer, Dr. M. Brundrett and Professor S. Smith for providing inoculum and are very grateful to Dr. G. Bowen, Dr. I. Jakobsen, and Professor R. Koske for their many helpful comments on the manuscript. We would also like to thank an anonymous referee for alerting us to factors which may have contributed to differences among fungi.

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  1. School of Earth and Geographical Sciences, Faculty of Natural and Agricultural Sciences, The University of Western Australia, Nedlands, WA, 6009, Australia

    S. Juniper & L. K. Abbott

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Correspondence to L. K. Abbott.

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Juniper, S., Abbott, L.K. Soil salinity delays germination and limits growth of hyphae from propagules of arbuscular mycorrhizal fungi. Mycorrhiza 16, 371–379 (2006). https://doi.org/10.1007/s00572-006-0046-9

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