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2015 ; 6
(ä): 434
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The olive knot disease as a model to study the role of interspecies bacterial
communities in plant disease
#MMPMID26113855
Buonaurio R
; Moretti C
; da Silva DP
; Cortese C
; Ramos C
; Venturi V
Front Plant Sci
2015[]; 6
(ä): 434
PMID26113855
show ga
There is an increasing interest in studying interspecies bacterial interactions
in diseases of animals and plants as it is believed that the great majority of
bacteria found in nature live in complex communities. Plant pathologists have
thus far mainly focused on studies involving single species or on their
interactions with antagonistic competitors. A bacterial disease used as model to
study multispecies interactions is the olive knot disease, caused by Pseudomonas
savastanoi pv. savastanoi (Psv). Knots caused by Psv in branches and other aerial
parts of the olive trees are an ideal niche not only for the pathogen but also
for many other plant-associated bacterial species, mainly belonging to the genera
Pantoea, Pectobacterium, Erwinia, and Curtobacterium. The non-pathogenic
bacterial species Erwinia toletana, Pantoea agglomerans, and Erwinia oleae, which
are frequently isolated inside the olive knots, cooperate with Psv in modulating
the disease severity. Co-inoculations of these species with Psv result in bigger
knots and better bacterial colonization when compared to single inoculations.
Moreover, harmless bacteria co-localize with the pathogen inside the knots,
indicating the formation of stable bacterial consortia that may facilitate the
exchange of quorum sensing signals and metabolites. Here we discuss the possible
role of bacterial communities in the establishment and development of olive knot
disease, which we believe could be taking place in many other bacterial plant
diseases.