Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Groundwater as a reservoir for plant pathogenic bacteria : the case of Pseudomonas syringae complex in the alluvial aquifer of Avignon

Version 1 : Received: 1 June 2023 / Approved: 2 June 2023 / Online: 2 June 2023 (15:38:59 CEST)

How to cite: Berge, O.; Nofal, S.; Razan, F.; Chandeysson, C.; Guilbaud, C.; Cognard-Plancq, A.; Morris, C.E. Groundwater as a reservoir for plant pathogenic bacteria : the case of Pseudomonas syringae complex in the alluvial aquifer of Avignon. Preprints 2023, 2023060217. https://doi.org/10.20944/preprints202306.0217.v1 Berge, O.; Nofal, S.; Razan, F.; Chandeysson, C.; Guilbaud, C.; Cognard-Plancq, A.; Morris, C.E. Groundwater as a reservoir for plant pathogenic bacteria : the case of Pseudomonas syringae complex in the alluvial aquifer of Avignon. Preprints 2023, 2023060217. https://doi.org/10.20944/preprints202306.0217.v1

Abstract

There is significant lack of information on the presence of plant pathogens in aquifer, increasingly used for irrigation during last decades and considered mostly free of them. In this work, we report the presence of bacteria from the Pseudomonas syringae complex (referred as PsyC) including phytopathogenic bacteria, in groundwater of Avignon, France. Their concentration was variable and inversely correlated with water electrical conductivity. Their mean abundance were hundred times lower than in the river Durance, connected with the aquifer but surprisingly, their genetic structure were more homogeneous. Moreover, most strains (97 %) from groundwater were tested as potentially pathogenic on plants, when in the river they were only 71 %. Determinants of this low diversity and high aggressiveness remain to be identified. We conclude that aquifers must be considered potential plant pathogenic reservoirs even if more surveys are needed to understand the real impact on crops during irrigation. These results could be included in prediction models and new approaches to disease forecasting and surveillance and could lead to adaptation of agricultural practices.

Keywords

Aquatic microbiology; Bacteria; Microbial ecology; Phytopathogens; Irrigation

Subject

Biology and Life Sciences, Ecology, Evolution, Behavior and Systematics

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