13.6 Conclusions
Oidiodendron maius forms associations with the roots of ericaceous shrubs, though the nature of the relationship remains uncertain. Is it a mutualistic mycorrhizal association, a preemptively colonised refugium for the fungus, a case of parasitism of the fungus by the plant, or some combination of the three? In vitro studies indicate that O. maius can improve host plant growth both by aiding plant nutrition and detoxifying the soil environment, although the benefits to O. maius are unclear. It remains necessary to investigate the benefits to both partners and demonstrate what environmental conditions determine the functional nature of the relationship. O. maius has the potential to degrade complex organic polymers within the soil, thus it is unlikely that it would rely on host photosynthate for survival. However, it is possible that O. maius receives some photosynthate, which could supplement saprobically derived carbon, potentially giving O. maius a competitive advantage over other soil fungi. The tendency towards microspermy in the Ericaceae and the saprobic abilities of ericoid endophytes suggests that ericoid mycorrhizal associations may represent another example of controlled parasitism of a fungal partner by the host plant, similar to the type that occurs with orchids. Entrapment of O. maius could confer a competitive advantage on the host plants by increasing the supply of organically bound nutrients-unavailable to plants that lack ericoid mycorrhizas, and by supplementing host plant photosynthesis with fungal-derived carbon. Given the wide taxonomic tolerance that ericaceous plants have for root endophytic fungi in vitro, the obvious need for more detailed studies of endophytic diversity of fungi growing in plants in situ, the enigmatic ecological roles of related Helotialean fungi (e.g. P. fortinii, Geomyces, etc.), much more exploratory and empirical research is needed before we will be able to answer the question posed at the outset of this chapter.
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Rice, A.V., Currah, R.S. (2006). Oidiodendron maius: Saprobe in Sphagnum Peat, Mutualist in Ericaceous Roots?. In: Schulz, B.J.E., Boyle, C.J.C., Sieber, T.N. (eds) Microbial Root Endophytes. Soil Biology, vol 9. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-33526-9_13
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