Plant responses underlying nonhost resistance of Citrus limon against Xanthomonas campestris pv. campestris.
PAMP-triggered immunity
biofilm formation
canker disease
glucosinolates
protection
salicylic acid
stomatal immunity
Journal
Molecular plant pathology
ISSN: 1364-3703
Titre abrégé: Mol Plant Pathol
Pays: England
ID NLM: 100954969
Informations de publication
Date de publication:
02 2019
02 2019
Historique:
pubmed:
28
9
2018
medline:
9
8
2019
entrez:
28
9
2018
Statut:
ppublish
Résumé
Citrus is an economically important fruit crop that is severely afflicted by citrus canker, a disease caused by Xanthomonas citri ssp. citri (X. citri); thus, new sustainable strategies to manage this disease are needed. Although all Citrus spp. are susceptible to this pathogen, they are resistant to other Xanthomonas species, exhibiting non-host resistance (NHR), for example, to the brassica pathogen X. campestris pv. campestris (Xcc) and a gene-for-gene host defence response (HDR) to the canker-causing X. fuscans ssp. aurantifolii (Xfa) strain C. Here, we examine the plant factors associated with the NHR of C. limon to Xcc. We show that Xcc induced asymptomatic type I NHR, allowing the bacterium to survive in a stationary phase in the non-host tissue. In C. limon, this NHR shared some similarities with HDR; both defence responses interfered with biofilm formation, and were associated with callose deposition, induction of the salicylic acid (SA) signalling pathway and the repression of abscisic acid (ABA) signalling. However, greater stomatal closure was seen during NHR than during HDR, together with different patterns of accumulation of reactive oxygen species and phenolic compounds and the expression of secondary metabolites. Overall, these differences, independent of Xcc type III effector proteins, could contribute to the higher protection elicited against canker development. We propose that Xcc may have the potential to steadily activate inducible defence responses. An understanding of these plant responses (and their triggers) may allow the development of a sustained and sustainable resistance to citrus canker.
Identifiants
pubmed: 30260546
doi: 10.1111/mpp.12752
pmc: PMC6637874
doi:
Substances chimiques
Reactive Oxygen Species
0
Abscisic Acid
72S9A8J5GW
Salicylic Acid
O414PZ4LPZ
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Pagination
254-269Informations de copyright
© 2018 BSPP and John Wiley & Sons Ltd.
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