Quorum Sensing in Pseudomonas savastanoi pv. savastanoi and Erwinia toletana: Role in Virulence and Interspecies Interactions in the Olive Knot

Applied and Environmental Microbiology
Eloy Caballo-PonceVittorio Venturi

Abstract

The olive knot disease (Olea europea L.) is caused by the bacterium Pseudomonas savastanoi pv. savastanoi. P. savastanoi pv. savastanoi in the olive knot undergoes interspecies interactions with the harmless endophyte Erwinia toletana; P. savastanoi pv. savastanoi and E. toletana colocalize and form a stable community, resulting in a more aggressive disease. P. savastanoi pv. savastanoi and Etoletana produce the same type of the N-acylhomoserine lactone (AHL) quorum sensing (QS) signal, and they share AHLs in planta In this work, we have further studied the AHL QS systems of P. savastanoi pv. savastanoi and Etoletana in order to determine possible molecular mechanism(s) involved in this bacterial interspecies interaction/cooperation. The AHL QS regulons of P. savastanoi pv. savastanoi and Etoletana were determined, allowing the identification of several QS-regulated genes. Surprisingly, the P. savastanoi pv. savastanoi QS regulon consisted of only a few loci whereas in Etoletana many putative metabolic genes were regulated by QS, among which are several involved in carbohydrate metabolism. One of these loci was the aldolase-encoding gene garL, which was found to be essential for both colocalization of P. savastanoi pv. savastan...Continue Reading

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Citations

Sep 5, 2020·Critical Reviews in Microbiology·Léa GirardRené De Mot
Jul 1, 2020·Annual Review of Phytopathology·Maren L Friesen
Dec 18, 2020·FEMS Microbiology Ecology·Tomohiro MorohoshiNobutaka Someya
Sep 11, 2020·Journal of Experimental Botany·Vasvi ChaudhryEric Kemen
Jun 9, 2021·Bioscience, Biotechnology, and Biochemistry·Tomohiro MorohoshiNobutaka Someya
Aug 8, 2021·Microorganisms·Alba Moreno-PérezLuis Rodríguez-Moreno

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