Roots develop in response to genetics, the growing environment, water and nutrition. A mycorrhizal association can influence plant resource relationships, but fungal hyphae are not plant roots. Root appearance alone is not a reliable measure of colonization. Placement creates the opportunity; establishment requires a viable fungus and compatible living roots.
Keep the context.
Biological compatibility, successful colonisation and a measurable plant response are different questions. The growing conditions matter, and general research is not a promise of a particular result with MegaMyco.
References
Read the biology at its source. These references describe general science and study-specific findings.