Pseudomonas syringae activates ZAT18 to inhibit SA accumulation by repressing EDS1 transcript for bacterial infection

2021 ◽  
Author(s):  
Yuhan Gao ◽  
Ze Li ◽  
Chenyu Yang ◽  
Guangyue Li ◽  
Hongmei Zeng ◽  
...  
2012 ◽  
Vol 65 ◽  
pp. 289-289
Author(s):  
N.J. Larsen ◽  
P.W. Sutherland ◽  
I.C. Hallett ◽  
M.K. Jones ◽  
I.P.S. Pushparajah ◽  
...  

Pseudomonas syringae pv actinidiae (Psa) is a bacterium whose virulent form (PsaV) causes severe infections of kiwifruit particularly Actinidia chinensis Hort16A Lenticels on kiwifruit canes function as pores allowing gaseous exchange The lenticellular structure penetrates through the periderm potentially allowing bacterial entry and subsequent cortex infection Bacteria have been observed inside and directly below lenticels from ca 3yearold woody tissue from the field To investigate this pathway of bacterial infection further lenticels from three wood ages were inoculated with a strain of PsaV at 109 cfu/ml Brown staining was observed on lenticels 3 days after inoculation on the youngest wood (< 1 year old) Lenticels were sectioned 2 and 4 weeks after inoculation and isolations were conducted from sterilised tissue after 4 weeks Psa was visible inside lenticels of the youngest wood 2 weeks postinoculation and was also isolated from the youngest tissue after 4 weeks Bacteria were not observed in lenticels of older wood and Psa was not isolated


2007 ◽  
Vol 20 (11) ◽  
pp. 1439-1448 ◽  
Author(s):  
Laura Zacarés ◽  
María Pilar López-Gresa ◽  
Joaquín Fayos ◽  
Jaime Primo ◽  
José María Bellés ◽  
...  

Inoculation of tomato plants (Solanum lycopersicum cv. Rutgers) with Pseudomonas syringae pv. tomato led to the production of a hypersensitive-like response in this pathovar of tomato. Accumulation of hydroxycinnamic acid amides (HCAA) of tyramine (p-coumaroyltyramine and feruloyltyramine) and dopamine (p-coumaroyldopamine and feruloyldopamine) was detected after bacterial infection. Two of them, p-coumaroyldopamine and feruloyldopamine, are described for the first time. The accumulation of HCAA was preceded by an increment of hydroxycinnamoyl-CoA:tyramine N-hydroxycinnamoyl transferase (THT) gene expression. HCAA also accumulated in transgenic NahG tomato plants overexpressing a bacterial salicylic hydroxylase. However, treatment of plants with the ethylene biosynthesis inhibitor, aminoethoxyvinilglycine, led to a reduction in the accumulation of THT transcripts and HCAA. Together, the results suggest that pathogen-induced induction of ethylene is essential for HCAA synthesis, whereas salicylic acid is not required for this response. In addition, notable antibacterial and antioxidant activities were found for the new HCAA, thus indicating that they could play a role in the defense of tomato plants against bacterial infection.


Author(s):  
D.A. Palmer ◽  
C.L. Bender

Coronatine is a non-host-specific phytotoxin produced by several members of the Pseudomonas syringae group of pathovars. The toxin acts as a virulence factor in P. syringae pv. tomato, allowing the organism to multiply to a higher population density and develop larger lesions than mutant strains unable to produce the toxin. The most prominent symptom observed in leaf tissue treated with coronatine is an intense spreading chlorosis; this has been attributed to a loss of chlorophylls a and b in tobacco. Coronatine's effects on membrane integrity and cell ultrastructure have not been previously investigated. The present study describes changes in tomato leaves in response to treatment with purified coronatine, infection by a coronatine-producing strain of P. syringae pv. tomato, and infection by a cor" mutant.In contrast to H2O-treated tissue, coronatine-treated tissue showed a diffuse chlorosis extending approximately 5 mm from the inoculation site. Leaf thickness, cell number, and cell dimensions were similar for both healthy and coronatine-treated, chlorotic tissue; however, the epidermal cell walls were consistently thicker in coronatine-treated leaves (Figs, la and lb).


Author(s):  
Mohammad M. Al-Qattan ◽  
Nada G. AlQadri ◽  
Ghada AlHayaza

Abstract Introduction Herpetic whitlows in infants are rare. Previous authors only reported individual case reports. We present a case series of six infants. Materials and Methods This is a retrospective study of six cases of herpetic whitlows in infants seen by the senior author (MMA) over the past 23 years (1995–2017 inclusive). The following data were collected: age, sex, digit involved in the hand, mode of transmission, time of presentation to the author, clinical appearance, presence of secondary bacterial infection, presence of other lesions outside the hand, method of diagnosis, treatment, and outcome. Results All six infants initially presented with classic multiple vesicles of the digital pulp. In all cases, there was a history of active herpes labialis in the mother. Incision and drainage or deroofing of the vesicles (for diagnostic purposes) resulted in secondary bacterial infection. Conclusion The current report is the first series in the literature on herpetic whitlows in infants. We stress on the mode of transmission (from the mother) and establishing the diagnosis clinically. In these cases, no need for obtaining viral cultures or polymerase chain reaction; and no medications are required. Once the vesicles are disrupted, secondary bacterial infection is frequent and a combination of oral acyclovir and intravenous antibiotics will be required.


2014 ◽  
Vol 4 (2) ◽  
pp. 85 ◽  
Author(s):  
Jimyung Kim ◽  
Miyoung Jang ◽  
Sun Hoe Koo ◽  
Kye Chul Kwon
Keyword(s):  

2016 ◽  
pp. 162-166
Author(s):  
V.O. Benyuk ◽  
◽  
O.I. Grinevich ◽  
I.A. Usevich ◽  
I.S. Sikachova ◽  
...  

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