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Pseudomonas fluorescens PICF7, an olive root endophyte with biocontrol and plant-growth promotion abilities

AuthorsMercado-Blanco, Jesús ; Maldonado-González, María Mercedes ; Gómez-Lama Cabanás, Carmen ; Prieto, Pilar
Issue DateNov-2015
CitationInternational Symposium Microbe-Assisted Crop Production - Opportunities, Challenges & Needs (2015)
AbstractPseudomonas fluorescens PICF7 is a natural colonizer of olive (Olea europaea L.) roots. Our previous studies have demonstrated that this strain is an effective biocontrol agent (BCA) against Verticillium wilt of olive (VWO), one of the most important diseases affecting this woody crop caused by the soilborne fungal pathogen Verticillium dahliae. Endophytic lifestyle of strain PICF7 in olive root tissues was demonstrated under different experimenta l conditions as well. Root hairs were shown to play a key role in the endophytic colonization of root tissues by this rhizobacteria. Surface colonization of intact olive roots and endophytic establishment by PICF7 seem to be required for the effective control of VWO. Yet, mechanism(s) underlying PICF7-mediated biocontrol of V. dahliae and endophytism remain poorly understood. Mutant analysis has revealed that bacteria! traits such as siderophore pyoverdine production and swimming motility are needed neither for biocontrol performance nor endophytic lifestyle. On the other hand, colonization of olive roots by PICF7 triggers a broad range of transcriptomic changes, mostly related to defense responses to different (a)biotic stresses. Sorne of these responses occur at both local (roots) and systemic (stems) leve!. The way they are modulated along time could explairi biocontrol effectiveness of strain PICF7 and how olive tissues recognize this bacterium as a lnon-hostilel invader. While systemic defense responses are activated upon olive root colonization1 presence of PICF7 in this organ does not hinder olive knot development caused by Pseudomonas savastanoi pv. savastanoi (Psv), another relevant olive pathogen. However, when the BCA and the pathogenic bacterium are co-inoculated in stems, PICF7 altered both the appearance and anatomy of the tumors as well as the localization of Psv within the hyperplasic tissue. Strain PICF7 is also able to colonize roots of barley (Hordeum vulgare L.), even endophytically. lt also prometes plant growth and increases yield in this Poaceae species. Thus, strain PICF7 seems to be a versatile root endophyte providing benefits to the host which colonizes. The recent release of strain PICF7 genome will undoubtedly help to identify traits involved in biocontrol, endophytism and plant growth promotion.
DescriptionTrabajo presentado en el International Symposium Microbe-Assisted Crop Production - Opportunities, Challenges & Needs (MICROPE), celebrado en Viena del 23 al 25 de noviembre de 2015.
Appears in Collections:(IAS) Comunicaciones congresos
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