Abstract
Nested PCR amplicons of ribosomal RNA genes have been used to identify individuals within assemblages of arbuscular mycorrhizal (AM) fungi in roots and to estimate their relative abundance. Microscopy has also been used to identify their relative abundance in roots, but only at low resolution, usually the genus level. We evaluated the robustness of using nested PCR amplicons of ribosomal RNA genes to estimate the relative abundance of undefined AM fungi in uniformly aged roots in comparison to visual estimates. The relative abundance of AM fungi was assessed as per cent root length colonised by morphotypes and relative sequence type abundance in clone libraries. Plants were grown in coastal soil to obtain assemblages of unknown AM fungi at two times (spring and autumn). Relative abundance of dominant genera of AM fungi in roots (Archaeospora and Glomus) based on an analysis of ribosomal RNA genes did not consistently correspond with relative abundance of morphotypes. This microscopic vs. molecular genetic comparison supports previous conclusions that there can be limitations in using nested PCR amplicons for quantifying the relative abundance of AM fungi in roots, with a sampling bias likely to be of significance. Both molecular genetic and morphological methods are used to estimate relative abundance of AM fungi as a precursor to understanding mycorrhizal function in field soils, but they are rarely verified using alternative approaches although this may be necessary.
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Acknowledgements
This research was enabled by the support of the Australian Research Council and Linkage grant partner Alcoa of Australia under project LP07765963 lead by Associate Professor Daniel Murphy and the China Scholarship Council under the State Scholarship Fund. We thank Drs. Yoshi Sawada and Mark Dobrowlski for assistance during the sampling, Dr. Zakaria Solaiman for technical advice on mycorrhizal morphology, Dr. Kevin Murray for statistical analysis and Dr. Ian Phillips for project support. A sampling permit was provided by the Department of Environment and Conservation, Western Australia. We appreciate the valuable comments on our manuscript made by Drs. Hayley Ridgeway, Deirdre Gleeson, Ian Abbott and anonymous reviewers.
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Shi, P., Abbott, L.K., Banning, N.C. et al. Comparison of morphological and molecular genetic quantification of relative abundance of arbuscular mycorrhizal fungi within roots. Mycorrhiza 22, 501–513 (2012). https://doi.org/10.1007/s00572-011-0425-8
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DOI: https://doi.org/10.1007/s00572-011-0425-8