Infectivity and effectiveness of different species of arbuscular mycorrhizal fungi in micropropagated plants of Mr S 2/5 plum rootstock P. Fortuna, S. Citernesi, S. Morini, M. Giovannetti and F. LoretiAgronomie, 12 10 (1992) 825-829DOI: https://doi.org/10.1051/agro:19921015