Mycorrhizal Symbiosis Triggers Local Resistance in Citrus Plants Against Spider Mites
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Altres documents de l'autoria: Manresa Grao, María; Pastor Fernández, Julia; Sánchez-Bel, Paloma; Jaques , Josep A.; Pastor, Victoria; Flors, Victor
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Mycorrhizal Symbiosis Triggers Local Resistance in Citrus Plants Against Spider MitesAutoria
Data de publicació
2022Editor
Frontiers MediaISSN
1664-462XCita bibliogràfica
Manresa-Grao M, Pastor-Fernández J, Sanchez-Bel P, Jaques JA, Pastor V and Flors V (2022) Mycorrhizal Symbiosis Triggers Local Resistance in Citrus Plants Against Spider Mites. Front. Plant Sci. 13:867778. doi: 10.3389/fpls.2022.867778Tipus de document
info:eu-repo/semantics/articleVersió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
Citrus plants are a highly mycotrophic species with high levels of fungal colonization.
Citrus aurantium rootstocks typically show abundant root colonization by Rhizophagus
irregularis three weeks after inoculation. ... [+]
Citrus plants are a highly mycotrophic species with high levels of fungal colonization.
Citrus aurantium rootstocks typically show abundant root colonization by Rhizophagus
irregularis three weeks after inoculation. Mycorrhizal symbiosis protects plants against
multiple biotic stressors, however, such protection against spider mites remains
controversial. We examined mycorrhiza-induced resistance (MIR) in citrus against the
two-spotted spider mite Tetranychus urticae. Mycorrhized C. aurantium displayed
reduced levels of damage in leaves and lower mite oviposition rates, compared
to non-mycorrhized controls. Mycorrhization did not affect host choice of mites in
Y-tube assays; of note, C. aurantium has innate strong antixenotic resistance against
this mite. Analysis of metabolism pathways in mycorrhized citrus plants showed
upregulated expression of the oxylipin-related genes LOX-2 and PR-3 early after
infestation. Accordingly, jasmonic acid (JA), 12-oxo phytodienoic acid (OPDA), and
JA-Ile concentrations were increased by mycorrhization. Non-targeted metabolomic
analysis revealed the amino acid, oxocarboxylic acid, and phenylpropanoid metabolism
as the three major pathways with more hits at 24 h post infection (hpi) in mycorrhized
plants. Interestingly, there was a transition to a priming profile of these pathways at 48
hpi following infestation. Three flavonoids (i.e., malic acid, coumaric acid, and diconiferyl
alcohol) were among the priming compounds. A mixture containing all these compounds
provided efficient protection against the mite. Unexpectedly, systemic resistance did not
improve after 72 h of primary infestation, probably due to the innate strong systemic
resistance of C. aurantium. This is the first study to show that MIR is functional against
T. urticae in locally infested citrus leaves, which is mediated by a complex pool of
secondary metabolites and is likely coordinated by priming of JA-dependent responses. [-]
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Frontiers in Plant Science, 13:867778Drets d'accés
info:eu-repo/semantics/openAccess
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