I just want to know what exactly is the role of AM fungi in P solubilization. Do they have direct effect or indirect effect like collaborating with P solubilizing bacteria etc?
you might receive some help in the following papers
http://onlinelibrary.wiley.com/doi/10.1002/clen.201300492/abstract
http://link.springer.com/article/10.1007%2FBF02374991#page-1
My understanding is that "glomalin" produced by AMF makes inorganic-P more labile in the soil matrix, making the compound more soluble and hence biologically available to plant hosts. There are also soil structuring effects promoted by extraradical hyphae (as well as glomalin, though some would argue glomalin is just old AMF tissue that is in the process of being decomposed), which assist with host nutrient acquisition (including P uptake) indirectly by increasing surface area of soil particles. There's not many bacteria I'm aware of that readily solubilize soil-bound inorganic phosphorous, at least not to the same extent that AMF do; hence, I would expect AMF to be the dominant driver of this process in natural systems.
The mycorrhizal symbiosis maintains and, in many cases, stimulates plant growth while substantially reducing fertilizer requirements. The fungal mycelium acts for plants as an extension of their root systems, allowing them to optimize the use of soil water and soil minerals from a much larger volume of soil. Healthier plants better resist environmental stresses such as drought, chilling and pollution, and have an improved capacity to survive certain bacterial and fungal pathogen attacks. AM fungi improve soil quality by increasing soil micro flora diversity and abundance and by reducing soil erosion through by a better plant rooting capacity.
you may also get more from the give web adress http://www.agr.gc.ca/eng/science-and-innovation/research-centres/ontario/eastern-cereal-and-oilseed-research-centre/the-glomeromycetes-in-vitro-collection/arbuscular-mycorrhizal-fungi-and-their-symbiosis-with-plants/?id=1236712919454
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