scholarly journals Salicylic Acid Accumulation in Barley Is Pathogen Specific but Not Required for Defense-Gene Activation

1998 ◽  
Vol 11 (7) ◽  
pp. 702-705 ◽  
Author(s):  
Laurence Vallélian-Bindschedler ◽  
Jean-Pierre Métraux ◽  
Patrick Schweizer
Keyword(s):  
Salicylic Acid ◽  
Hordeum Vulgare ◽  
Pseudomonas Syringae ◽  
Gene Activation ◽  
Defense Gene ◽  
Biotrophic Pathogen ◽  
Pathogenesis Related ◽  
Acid Accumulation ◽  
Salicylic Acid Accumulation ◽  
Related Proteins

Barley (Hordeum vulgare) seedlings were inoculated with the biotrophic pathogen Erysiphe graminis f. sp. hordei, the biotrophic nonhost pathogen E. graminis f. sp. tritici, and the necrotrophic nonhost pathogen Pseudomonas syringae pv. syringae. The levels of free salicylic acid and of salicylic-acid conjugates remained low after infection with E. graminis f. sp. hordei or E. graminis f. sp. tritici while they increased after inoculation with P. syringae pv. syringae. Pathogenesis-related proteins PR1, PR3 (chitinase), PR5 (thaumatin-like), and PR9 (peroxidase) accumulated after inoculation with all three pathogens.

scholarly journals Coronatine Promotes Pseudomonas syringae Virulence in Plants by Activating a Signaling Cascade that Inhibits Salicylic Acid Accumulation

2012 ◽  
Vol 11 (6) ◽  
pp. 587-596 ◽  
Author(s):  
Xiao-yu Zheng ◽  
Natalie Weaver Spivey ◽  
Weiqing Zeng ◽  
Po-Pu Liu ◽  
Zheng Qing Fu ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Pseudomonas Syringae ◽  
Signaling Cascade ◽  
Acid Accumulation ◽  
Salicylic Acid Accumulation

scholarly journals Preliminary Pathogenesis-relative Pathways Network Analysis and Relative Putative Genes Annotation In Vitis shuttleworthii Grape through EST Analysis

HortScience ◽  
2004 ◽  
Vol 39 (4) ◽  
pp. 756D-756
Author(s):  
Jiang Lu* ◽  
Hong Huang ◽  
Wayne Hunter ◽  
Phat Dang ◽  
Stephen Leong
Keyword(s):  
Network Analysis ◽  
Protein Function ◽  
Gene Activation ◽  
Bacterial Pathogen ◽  
Coding Region ◽  
Defense Gene ◽  
Est Analysis ◽  
Pathogenesis Related ◽  
Open Coding ◽  
Related Proteins

Vitis shuttleworthii is one of the most disease and pest resistant grape species originated and distributed in the southeast United States. It is highly resistant to Pierce's disease, anthracnose, black rot and downy mildew diseases, which are the limited factors to grow Vitis vinifera grapes in this region. A V. shuttleworthii cDNA library was constructed with mRNA isolated from leaves and flowers harvested during anthesis. 12,008 clean EST sequences were obtained and assembled. and generated 5776 unigenes 2106 contigs and 3670 singletons). ESTs distribution based on protein function using a modified MIPS MATDB Arabidopsis Scheme revealed that 7% of the V. shuttleworthii ESTs were related to disease/pest defense or stress tolerance genes. Over 300 contigs containing complete or 90% open coding region of known functional genes were obtained. The ESTs that were annotated as pathogenesis-related proteins, enzymes in salicylic acid, jasmonic acid, and ethylene signaling, were selected for further study in order to elucidate the role and interaction of them in the signal transduction cascade that leads to grape defense gene activation upon treatment of bacterial pathogen. We report the identification of novel disease resistant genes based on preliminary pathogenesis-relative pathways network analysis.

scholarly journals Feedback Control of the Arabidopsis Hypersensitive Response

2004 ◽  
Vol 17 (4) ◽  
pp. 357-365 ◽  
Author(s):  
Chu Zhang ◽  
Annie Tang Gutsche ◽  
Allan D. Shapiro
Keyword(s):  
Hydrogen Peroxide ◽  
Salicylic Acid ◽  
Pseudomonas Syringae ◽  
Hypersensitive Response ◽  
Ion Leakage ◽  
Wild Type ◽  
Regulatory Circuits ◽  
Acid Accumulation ◽  
Salicylic Acid Accumulation ◽  
Hydrogen Peroxide Accumulation

The plant hypersensitive response (HR) to avirulent bacterial pathogens results from programmed cell death of plant cells in the infected region. Ion leakage and changes in signaling components associated with HR progression were measured. These studies compared Arabidopsis mutants affecting feedback loops with wild-type plants, with timepoints taken hourly. In response to Pseudomonas syringae pv. tomato DC3000·avrB, npr1-2 mutant plants showed increased ion leakage relative to wild-type plants. Hydrogen peroxide accumulation was similar to that in wild type, but salicylic acid accumulation was reduced at some timepoints. With DC3000·avrRpt2, similar trends were seen. In response to DC3000·avrB, ndr1-1 mutant plants showed more ion leakage than wild-type or npr1-2 plants. Hydrogen peroxide accumulation was delayed by approximately 1 h and reached half the level seen with wild-type plants. Salicylic acid accumulation was similar to npr1-2 mutant plants. With DC3000·avrRpt2, ndr1-1 mutant plants showed no ion leakage, no hydrogen peroxide accumulation, and minimal salicylic acid accumulation. Results with a ndr1-1 and npr1-2 double mutant were similar to ndr1-1. A model consistent with these data is presented, in which one positive and two negative regulatory circuits control HR progression. Understanding this circuitry will facilitate HR manipulation for enhanced disease resistance.

scholarly journals Systemic Acquired Resistance in Canola Is Linked with Pathogenesis-Related Gene Expression and Requires Salicylic Acid

2007 ◽  
Vol 97 (7) ◽  
pp. 794-802 ◽  
Author(s):  
Shobha D. Potlakayala ◽  
Darwin W. Reed ◽  
Patrick S. Covello ◽  
Pierre R. Fobert
Keyword(s):  
Salicylic Acid ◽  
Pseudomonas Syringae ◽  
Systemic Acquired Resistance ◽  
Induced Defense ◽  
Acquired Resistance ◽  
Microbial Pathogens ◽  
Broad Host Range ◽  
Avirulent Strain ◽  
Enhanced Resistance ◽  
Pathogenesis Related

Systemic acquired resistance (SAR) is an induced defense response that confers long-lasting protection against a broad range of microbial pathogens. Here we show that treatment of Brassica napus plants with the SAR-inducing chemical benzo-(1,2,3)-thiadiazole-7-carbothioic acid S-methyl ester (BTH) significantly enhanced resistance against virulent strains of the bacterial pathogen Pseudomonas syringae pv. maculicola and the fungal pathogen Leptosphaeria maculans. Localized preinoculation of plants with an avirulent strain of P. syringae pv. maculicola also enhanced resistance to these pathogens but was not as effective as BTH treatment. Single applications of either SAR-inducing pretreatment were effective against P. syringae pv. maculicola, even when given more than 3 weeks prior to the secondary challenge. The pretreatments also led to the accumulation of pathogenesis-related (PR) genes, including BnPR-1 and BnPR-2, with higher levels of transcripts observed in the BTH-treatment material. B. napus plants expressing a bacterial salicylate hydroxylase transgene (NahG) that metabolizes salicylic acid to catechol were substantially compromised in SAR and accumulated reduced levels of PR gene transcripts when compared with untransformed controls. Thus, SAR in B. napus displays many of the hallmarks of classical SAR including long lasting and broad host range resistance, association with PR gene activation, and a requirement for salicylic acid.

scholarly journals Pathogen-inducibleCaUGT1is involved in resistance response against TMV infection by controlling salicylic acid accumulation

FEBS Letters ◽  
2009 ◽  
Vol 583 (13) ◽  
pp. 2315-2320 ◽  
Author(s):  
Boo-Ja Lee ◽  
Sung-Kyu Kim ◽  
Soo Bok Choi ◽  
Jungdon Bae ◽  
Ki-Jeong Kim ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Resistance Response ◽  
Acid Accumulation ◽  
Salicylic Acid Accumulation
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