title: The interaction with arbuscular mycorrhizal fungi or Trichoderma harzianum alters the shoot hormonal profile in melon plants.
abstract: Arbuscular mycorrhizal fungi (AMF) and Trichoderma harzianum are known to affect plant growth and disease resistance through interaction with phytohormone synthesis or transport in the plant. Cross-talk between these microorganisms and their host plants normally occurs in nature and may affect plant resistance. Simultaneous quantification in the shoots of melon plants revealed significant changes in the levels of several hormones in response to inoculation with T. harzianum and two different AMF (Glomus intraradices and Glomus mosseae). Analysis of zeatin (Ze), indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylic acid (ACC), salicylic acid (SA), jasmonic acid (JA) and abscisic acid (ABA) in the shoot showed common and divergent responses of melon plants to G. intraradices and G. mosseae. T. harzianum effected systemic increases in Ze, IAA, ACC, SA, JA and ABA. The interaction of T. harzianum and the AMF with the plant produced a characteristic hormonal profile, which differed from that produced by inoculation with each microorganism singly, suggesting an attenuation of the plant response, related to the hormones SA, JA and ethylene. These results are discussed in relation to their involvement in biomass allocation and basal resistance against Fusarium wilt.
authors.affiliation: CEBAS-CSIC, Department of Soil and Water Conservation and Organic Waste Management, Murcia, Spain. ammedina@cebas.csic.es
authors.forename: Ainhoa
authors.initials: A
authors.lastname: Martínez-Medina
authors.forename: Antonio
authors.initials: A
authors.lastname: Roldán
authors.forename: Alfonso
authors.initials: A
authors.lastname: Albacete
authors.forename: Jose A
authors.initials: JA
authors.lastname: Pascual
mesh_terms: D000040:Abscisic Acid / Q000378:metabolism; D000598:Amino Acids, Cyclic / Q000378:metabolism; D019662:Cucurbitaceae / Q000378:metabolism / Q000382:microbiology*; D003517:Cyclopentanes / Q000378:metabolism; D005670:Fusarium / Q000502:physiology; D055137:Glomeromycota / Q000502:physiology; D054884:Host-Pathogen Interactions; D007210:Indoleacetic Acids / Q000378:metabolism; D038821:Mycorrhizae / Q000502:physiology*; D054883:Oxylipins / Q000378:metabolism; D010937:Plant Growth Regulators; D018547:Plant Stems / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism; D014242:Trichoderma / Q000502:physiology*
chemical_list: D000598:Amino Acids, Cyclic; D003517:Cyclopentanes; D007210:Indoleacetic Acids; D054883:Oxylipins; D010937:Plant Growth Regulators; C023863:1-aminocyclopropane-1-carboxylic acid; C011006:jasmonic acid; C030737:indoleacetic acid; D000040:Abscisic Acid; D020156:Salicylic Acid