IICAR 25568
INSTITUTO DE INVESTIGACIONES EN CIENCIAS AGRARIAS DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Plant responses underlying nonhost resistance of Citrus limon against Xanthomonas campestris pv. campestris
Autor/es:
FAVARO M. A.; DANDREA R.; CHIESA M.A.; UVIEDO F.; GADEA J.; CHIESA M.A.; UVIEDO F.; GADEA J.; ROESCHLIN R.A.; CAMPOS-BENEYTO L.; MARANO M. R.; ROESCHLIN R.A.; CAMPOS-BENEYTO L.; MARANO M. R.; FAVARO M. A.; DANDREA R.
Revista:
MOLECULAR PLANT PATHOLOGY
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2019 vol. 20 p. 254 - 269
ISSN:
1464-6722
Resumen:
Citrus is an economically important fruit crop that is severelyafflicted by citrus canker, a disease caused by Xanthomonas citrissp. citri (X. citri); thus, new sustainable strategies to manage thisdisease are needed. Although all Citrus spp. are susceptible tothis pathogen, they are resistant to other Xanthomonas species,exhibiting non-host resistance (NHR), for example, to the brassicapathogen X. campestris pv. campestris (Xcc) and a gene-for-genehost defence response (HDR) to the canker-causing X. fuscansssp. aurantifolii (Xfa) strain C. Here, we examine the plant factorsassociated with the NHR of C. limon to Xcc. We show that Xccinduced asymptomatic type I NHR, allowing the bacterium to survivein a stationary phase in the non-host tissue. In C. limon, thisNHR shared some similarities with HDR; both defence responsesinterfered with biofilm formation, and were associated with callosedeposition, induction of the salicylic acid (SA) signallingpathway and the repression of abscisic acid (ABA) signalling.However, greater stomatal closure was seen during NHR thanduring HDR, together with different patterns of accumulation ofreactive oxygen species and phenolic compounds and the expressionof secondary metabolites. Overall, these differences, independentof Xcc type III effector proteins, could contribute to thehigher protection elicited against canker development. We proposethat Xcc may have the potential to steadily activate inducibledefence responses. An understanding of these plant responses(and their triggers) may allow the development of a sustained andsustainable resistance to citrus canker.
