The interaction with arbuscular mycorrhizal fungi or Trichoderma harzianum alters the shoot hormonal profile in melon plants

► Mycorrhizal establishment and Trichoderma harzianum-plant interaction imply changes in the shoot hormonal profile of melon plants. ► Colonisation of different AMF produces common and divergent plant responses. ► T. harzianum effected systemic increases in Ze, IAA, ACC, SA, JA and ABA shoot content. ► Co-inoculation with T. harzianum and AMF produces a characteristic shoot hormonal profile, which differs from that produced by single inoculation.