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Título
Alteration of cell wall xylan acetylation triggers defense responses that counterbalance the immune deficiencies of plants impaired in the β‐subunit of the heterotrimeric G‐protein
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
The Plant Journal
Número de la revista
3
Cita Bibliográfica
Escudero, V., Jordá, L., Sopeña-Torres, S., Mélida, H., Miedes, E., Muñoz-Barrios, A., Swami, S., Alexander, D., McKee, L. S., Sánchez-Vallet, A., Bulone, V., Jones, A. M., & Molina, A. (2017). Alteration of cell wall xylan acetylation triggers defense responses that counterbalance the immune deficiencies of plants impaired in the β-subunit of the heterotrimeric G-protein. Plant Journal, 92(3), 386-399. https://doi.org/10.1111/TPJ.13660
Editorial
Wiley-Blackwell
Fecha
2017
ISSN
0960-7412
Resumen
[EN] Arabidopsis heterotrimeric G-protein complex modulates pathogen-associated molecular pattern-triggeredimmunity (PTI) and disease resistance responses to different types of pathogens. It also plays a role in plantcell wall integrity as mutants impaired in the Gb-(agb1-2)orGc-subunits have an altered wall compositioncompared with wild-type plants. Here we performed a mutant screen to identify suppressors ofagb1-2(sgb) that restore susceptibility to pathogens to wild-type levels. Out of the foursgbmutants (sgb10–sgb13)identified,sgb11is a new mutant allele ofESKIMO1(ESK1), which encodes a plant-specific polysaccharideO-acetyltransferase involved in xylan acetylation. Null alleles (sgb11/esk1-7)ofESK1restore to wild-typelevels the enhanced susceptibility ofagb1-2to the necrotrophic fungusPlectosphaerella cucumerina BMM(PcBMM), but not to the bacteriumPseudomonas syringaepv.tomatoDC3000 or to the oomyceteHyaloper-onospora arabidopsidis. The enhanced resistance toPcBMMof theagb1-2 esk1-7double mutant was notthe result of the re-activation of deficient PTI responses inagb1-2. Alteration of cell wall xylan acetylationcaused byESK1impairment was accompanied by an enhanced accumulation of abscisic acid, the constitu-tive expression of genes encoding antibiotic peptides and enzymes involved in the biosynthesis of trypto-phan-derived metabolites, and the accumulation of disease resistance-related secondary metabolites anddifferent osmolites. Theseesk1-mediated responses counterbalance the defective PTI andPcBMMsuscepti-bility ofagb1-2plants, and explain the enhanced drought resistance ofesk1plants. These results suggestthat a deficient PTI-mediated resistance is partially compensated by the activation of specific cell-wall-trig-gered immune responses.
Materia
Palabras clave
Peer review
SI
ID proyecto
- info:eu-repo/grantAgreement/MINECO/ Programa Estatal de I+D+I Orientada a los Retos de la Sociedad/ BIO2015-64077-R/ES/ RESPUESTAS DE INMUNIDAD REGULADAS POR EL SISTEMA DE PERCEPCION DE INTEGRIDAD DE LA PARED CELULAR VEGETAL
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DOI
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