Abstract
Siderophores produced by microorganisms to scavenge iron from the environment have been shown to contribute to virulence and/or stress resistance of some plant pathogenic bacteria. Phytopathogenic bacteria of Pectobacterium genus possess genes for the synthesis of siderophore enterobactin, which role in plant-pathogen interactions has not been elucidated. In the present study we characterized the phenotype of the mutant strain of Pba deficient for the enterobactin-biosynthetic gene entA. We showed that enterobactin may be considered as a conditionally beneficial virulence factor of Pba. The entA knockout did not reduce Pba virulence on non-primed plants; however, salicylic acid-primed plants were more resistant to ΔentA mutant than to the wild type Pba. The reduced virulence of ΔentA mutant towards the primed plants is likely explained by its compromised resistance to oxidative stress.
Highlights
Academic Editors: Yangrong Cao and Hari B
The obtained ∆entA mutant did not differ in its growth in vitro from the wild type strain (Figure 1A)
Dickeya siderophores act as both iron carriers and inducers of host reactions related to iron assimilation, which is necessary for the disease development [12,26,28,29,33]
Summary
Academic Editors: Yangrong Cao and Hari B. Pectobacterium and Dickeya species belonging to soft rot Pectobacteriacea (SRP) cause devastating plant diseases [1]. Their main virulence determinants are plant cell wall degrading enzymes (PCWDEs) [2]. PCWDEs alone are not sufficient for SRP to be able to cause disease, and additional virulence factors were described for these pathogens. For Pectobacterium species, Svx protein [3], Nip protein [4], type 3 secretion system (T3SS) [5,6], T6SS [7,8], coronafacic acid [9,10,11] were shown to be required for full virulence. For Dickeya species, in addition to PCWDEs, siderophores were described as major virulence factors [12]
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