Thank you for your suggestion.

This information, perhaps  will be useful

http://www.plantphysiol.org/content/124/3/949

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1539291/pdf/hw0949.pdf

Dear Nashwa,

For basic information on mycorrhiza and its nutrition may be helpful:

Smith S.E., Read D.j. 2008. Mycorrhizal symbiosis. 3rd edition. Elsevier. ISBN 9780123705266 http://www.sciencedirect.com/science/book/9780123705266

Besides for mycorrhizal metabolism and mycorrhizas in phytopathogen control you can see relevant chapters from:

Koltai, Hinanit, Kapulnik, Yoram (Eds.) 2010. Arbuscular Mycorrhizas: Physiology and Function ISBN 978-90-481-9489-6 http://www.springer.com/us/book/9789048194889

Damase Khasa, Yves Piché, Andrew P. Coughlan (Eds.) 2009 Advances in Mycorrhizal Science and Technology ISBN: 978-0-660-19883-5 http://www.nrcresearchpress.com/doi/book/10.1139/9780660198835#.Vvo0oXpnh-w

Varma, Ajit (Ed.) 2008 Mycorrhiza State of the Art, Genetics and Molecular Biology, Eco-Function, Biotechnology, Eco-Physiology, Structure and Systematics. 3rd edition. Springer. ISBN 978-3-540-78826-3 http://www.springer.com/br/book/9783540788249

Siddiqui, Zaki Anwar, Akhtar, Mohammad Sayeed, Futai, Kazuyoshi (Eds.) 2008 Mycorrhizae: Sustainable Agriculture and Forestry. Springer. ISBN 978-1-4020-8770-7 http://www.springer.com/us/book/9781402087691

Devarajan Thangadurai, Carlos Alberto Busso, Mohamed Hijri (Eds.) 2010

Mycorrhizal Biotechnology. CRC Press. ISBN 9781578086917 https://www.crcpress.com/Mycorrhizal-Biotechnology/Thangadurai-Busso-Hijri/9781578086917

Azcón-Aguilar, C., Barea, J.M., Gianinazzi, S., Gianinazzi-Pearson, V. (Eds.) 2009 Mycorrhizas - Functional Processes and Ecological Impact. Springer. ISBN 978-3-540-87978-7 http://www.springer.com/jp/book/9783540879770

M.G.A. van der Heijden I.R. Sanders (Eds.) 2003 Mycorrhizal Ecology. Springer. ISBN 978-3-540-00204-8 http://www.springer.com/us/book/9783540002048

With best wishes,

Elena

If you are asking about AMF. It has a wide role and many factors like hormones, enzymes etc. are involved. In this case the most important term to be known is priming. You can follow Maria J Pozo papers. 

Please have a look at the following RG links.

Article Arbuscular Mycorrhizal Fungi In Plant Disease Control

Article Mycorrhizal Fungi as a Biocontrol Agent

Article Suppression of fungal and nematode plant pathogens through a...

Just to give you one of the many published datas on this topic. A tomato plant infected with Alternaria solani synthesize many substances to fight against the disease. At the same time, the plant send a chemical message to another tomato plant connected with mycorrhiza. This plant in turn will react and synthesize chemicals to be ready for a possible attack by Alternaria solani.

Ref: Song et al. Interplant communication of tomato plants through underground common mycorrhizal network, PLOS ONE DOI : 10, 137/journal-pone oo13324, 2010