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What are mycorrhizae propagules?

Propagules are, by definition, any part of the mycorrhizal fungi than can germinate and effectively connect with plant roots to establish a beneficial relationship. Propagules include intra- and extra-radical spores (which are reproductive structures, reminiscent of small pearls), mycorrhizal root fragments and small filament-like structures called ‘hyphae’. The latter lose their effectiveness quickly as a propagation agent as they are brittle with little energy reserve.

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