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Potential of indigenous bacteria form the olive rhizosphere as biological control agents against a broad range of phytopathogens

AuthorsRuano Rosa, David ; Valverde-Corredor, Antonio ; Gómez del Campo, María; Sesmero, Rafael; Mercado-Blanco, Jesús
Plant growth promotion
Verticillium dahlia
Issue DateMay-2015
Citation7th IOBC/WPRS Symposium Integrated Protection of Olive Crops (2015)
AbstractVerticillium wilt (Verticillium dahliae Kleb.) is one ofthe main biotic constraints affecting olive trees in the Mediterranean Basin. The difficulty to control this disease has urged researchers to seek effective measures within an integrated management framework. Biological control, alone or combined with other approaches, emerges as one of the most promising altematives to confront this pathogen. In this study, a collection of indigenous culturable bacteria (>300) from olive roots was generated. First selection was performed based on their antagonistic activity against V dahliae. As a result, 189 isolates were selected which were: (i) tested against a battery of relevant olive pathogens (V dahliae, Pseudomonas savastanoi pv. savastanoi, Rosellinia necatrix, Colletotrichum godetiae and Colletotrichum nymphaeae); (ii) identified molecularly; and (iii) screened for the presence of phenotypes usually associated to antagonism and!or plant growth promotion (PGP). Results showed predominan ce of phyla Proteo bacteria and Firmicutes, Pseudomonas and Bacillus being the most abundant genera. Although none of the strains showed effectiveness against all tested pathogens, many of them presented a broad antagonistic activity, particular! y strains of the genus Paenibacillus. Phenotypic characterization revealed enzymati~ activities usually associated to biocontrol . and PGP, such as production of catalase and siderophores, among others. This fact, together with the observed broad antagonist activity allow us to conclude that sorne of these bacteria are good candidates to be used as biological control agents in future bioformulations against diverse relevant olive pathogens.
DescriptionTrabajo presentado en el 7th IOBC/WPRS Symposium Integrated Protection of Olive Crops, celebrado en Kalamata (Grecia) del 11 al 14 de mayo de 2015.
Appears in Collections:(IAS) Comunicaciones congresos
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