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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Environ+Microbiol
2015 ; 17
(11
): 4253-70
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gab.com Text
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English Wikipedia
The bacterial alarmone (p)ppGpp is required for virulence and controls cell size
and survival of Pseudomonas syringae on plants
#MMPMID25626964
Chatnaparat T
; Li Z
; Korban SS
; Zhao Y
Environ Microbiol
2015[Nov]; 17
(11
): 4253-70
PMID25626964
show ga
The stringent response, mediated by second messenger (p)ppGpp, results in swift
and massive transcriptional reprogramming under nutrient limited conditions. In
this study, the role of (p)ppGpp on virulence of Pseudomonas syringae pv.
syringae?B728a (PssB728a) was investigated. The virulence of the relA/spoT
(ppGpp(0) ) double mutant was completely impaired on bean, and bacterial growth
was significantly reduced, suggesting that (p)ppGpp is required for full
virulence of P.?syringae. Expression of T3SS and other virulence genes was
reduced in ppGpp(0) mutants. In addition, ppGpp deficiency resulted in loss of
swarming motility, reduction of pyoverdine production, increased sensitivity to
oxidative stress and antibiotic tolerance, as well as reduced ability to utilize
?-amino butyric acid. Increased levels of ppGpp resulted in reduced cell size of
PssB728a when grown in a minimal medium and on plant surfaces, while most
ppGpp(0) mutant cells were not viable on plant surfaces 24?h after spray
inoculation, suggesting that ppGpp-mediated stringent response temporarily limits
cell growth, and might control cell survival on plants by limiting their growth.
These results demonstrated that ppGpp-mediated stringent response plays a central
role in P.?syringae virulence and survival and indicated that ppGpp serves as a
global signal for regulating various virulence traits in PssB728a.