Have you seen these and are they what you need? Most are from 2014.
These are available from ResearchGate:
Bouamri, R., Dalpé, Y., & Serrhini, M. N. (2014). Effect of seasonal variation on arbuscular mycorrhizal fungi associated with date palm. Emirates Journal of Food and Agriculture, 26(11), doi-10.
http://www.researchgate.net/publication/267777179
Symanczik, S., Błaszkowski, J., Koegel, S., Boller, T., Wiemken, A., & Al-Yahya’Ei, M. N. (2014). Isolation and identification of desert habituated arbuscular mycorrhizal fungi newly reported from the Arabian Peninsula. Journal of arid land, 6(4), 488-497.
Symanczik, S., Błaszkowski, J., Chwat, G., Boller, T., Wiemken, A., & Al-Yahya’ei, M. N. (2014). Three new species of arbuscular mycorrhizal fungi discovered at one location in a desert of Oman: Diversispora omaniana, Septoglomus nakheelum and Rhizophagus arabicus. Mycologia, 106(2), 243-259.
Ramos-Zapata, J. A., Orellana, R., & Allen, E. B. (2014). Establishment of Desmoncus orthacanthos Martius (Arecaceae): effect of inoculation with arbuscular mycorrhizae. Revista de biología tropical, 54(1), 65-72.
Sghir, F., Touati, J., Chliyeh, M., Touhami, A. O., Filali-Maltouf, A., El Modafar, C., ... & Douira, A. Diversity of arbuscular mycorrhizal fungi in the rhizosphere of date palm tree (Phoenix dactylifera) in Tafilalt and Zagora regions (Morocco).
Edy, N. (2015). Community structure of Arbuscular Mycorrhizal Fungi in temperate grassland and tropical land-use systems (Doctoral dissertation, Georg-August-University of Göttingen).
There are not so recent but may there are any classic work
Jack B. Fisher;_ and K. Jayachandran. 1999. Root structure and arbuscular mycorrhizal colonization of the palm Serenoa repens under field conditions. Plant and Soil 217: 229–241, 1999.
Beatriz Dreyer & Asunción Morte & José Ángel López & Mario Honrubia. 2010. Comparative study of mycorrhizal susceptibility and anatomy of four palm species. Mycorrhiza 20:103–115 DOI 10.1007/s00572-009-0266-x
Mohamed N. Al-Yahya’ei & Fritz Oehl & Marta Vallino & Erica Lumini & Dirk Redecker & Andres Wiemken & Paola Bonfante. 2011. Unique arbuscular mycorrhizal fungal communities uncovered in date palm plantations and surrounding desert habitats of Southern Arabia. Mycorrhiza 21:195–209 DOI 10.1007/s00572-010-0323-5.
José Ramos-Zapata, Roger Orellana, Patricia Guadarrama and Salvador Medina-Peralta. Contribution of Mycorrhizae to Early Growth and Phosphorus Uptake by a Neotropical Palm. 2009. Journal of Plant Nutrition. Journal of Plant Nutrition, 32: 855–866. ISSN: 0190-4167 print / 1532-4087 online. DOI: 10.1080/01904160902790333.
Roger Guevara & Juan C. López. Quality of rooting environments and patterns of root colonization by arbuscular mycorrhizal fungi in strangler figs in a Mexican palmetto woodland. Mycorrhiza DOI 10.1007/s00572-007-0136-3.
José A. Ramos-Zapata, Roger Orellana and Edith B. Allen. 2006. MYCORRHIZAL DYNAMICS AND DEPENDENCE OF Desmoncus orthacanthos MARTIUS (ARECACEAE), A NATIVE PALM OF THE YUCATAN PENINSULA, MEXICO. Interciencia MAY 2006, VOL. 31 Nº 5, p. 364-370.
I'n not too sure, but you might look for Phillip Keane's work (La Trobe University, Bundoora, Australia). He was working on coco palms and AMF in New Guinea from memory.