Hormonal and transcriptional profiles highlight common and differential host responses to arbuscular mycorrhizal fungi and the regulation of the oxylipin pathway.
Arbuscular mycorrhizal (AM) symbioses are mutualistic associations between soil fungi and most vascular plants. The symbiosis significantly affects the host physiology in terms of nutrition and stress resistance. Despite the lack of host range specificity of the interaction, functional diversity between AM fungal species exists. The interaction is finely regulated according to plant and fungal characters, and plant hormones are believed to orchestrate the modifications in the host plant. Using tomato as a model, an integrative analysis of the host response to different mycorrhizal fungi was performed combining multiple hormone determination and transcriptional profiling. Analysis of ethylene-, abscisic acid-, salicylic acid-, and jasmonate-related compounds evidenced common and divergent responses of tomato roots to Glomus mosseae and Glomus intraradices, two fungi differing in their colonization abilities and impact on the host. Both hormonal and transcriptional analyses revealed, among others, regulation of the oxylipin pathway during the AM symbiosis and point to a key regulatory role for jasmonates. In addition, the results suggest that specific responses to particular fungi underlie the differential impact of individual AM fungi on plant physiology, and particularly on its ability to cope with biotic stresses.
López-Ráez
Juan A
JA
Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín, Granada, Spain.
Verhage
Adriaan
A
Fernández
Iván
I
García
Juan M
JM
Azcón-Aguilar
Concepción
C
Flors
Victor
V
Pozo
María J
MJ
D000085:Acetates / Q000494:pharmacology; D015169:Colony Count, Microbial; D003517:Cyclopentanes / Q000494:pharmacology; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D055137:Glomeromycota / Q000166:cytology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D054884:Host-Pathogen Interactions / Q000235:genetics*; D018551:Solanum lycopersicum / Q000187:drug effects / Q000235:genetics* / Q000276:immunology / Q000382:microbiology; D053858:Metabolic Networks and Pathways / Q000187:drug effects; D038821:Mycorrhizae / Q000166:cytology / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D054883:Oxylipins / Q000737:chemistry / Q000378:metabolism* / Q000494:pharmacology; D010937:Plant Growth Regulators / Q000378:metabolism*; D018517:Plant Roots / Q000166:cytology / Q000235:genetics / Q000382:microbiology; D013559:Symbiosis / Q000187:drug effects / Q000235:genetics
D000085:Acetates; D003517:Cyclopentanes; D054883:Oxylipins; D010937:Plant Growth Regulators; C072239:methyl jasmonate