scholarly journals Competitive control of endoglucanase gene engXCA expression in the plant pathogen Xanthomonas campestris by the global transcriptional regulators HpaR1 and Clp

2018 ◽  
Vol 20 (1) ◽  
pp. 51-68 ◽  
Author(s):  
Guo-Fang Liu ◽  
Hui-Zhao Su ◽  
Han-Yang Sun ◽  
Guang-Tao Lu ◽  
Ji-Liang Tang
Keyword(s):  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Transcriptional Regulators ◽  
Endoglucanase Gene

Structure of the Full-Length Bacteriophytochrome from the Plant Pathogen Xanthomonas campestris Provides Clues to its Long-Range Signaling Mechanism

2016 ◽  
Vol 428 (19) ◽  
pp. 3702-3720 ◽  
Author(s):  
Lisandro Horacio Otero ◽  
Sebastián Klinke ◽  
Jimena Rinaldi ◽  
Francisco Velázquez-Escobar ◽  
María Andrea Mroginski ◽  
...  
Keyword(s):  
Long Range ◽  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Full Length ◽  
Signaling Mechanism

scholarly journals hpaR, a Putative marR Family Transcriptional Regulator, Is Positively Controlled by HrpG and HrpX and Involved in the Pathogenesis, Hypersensitive Response, and Extracellular Protease Production of Xanthomonas campestris Pathovar campestris

2006 ◽  
Vol 189 (5) ◽  
pp. 2055-2062 ◽  
Author(s):  
Ke Wei ◽  
Dong-Jie Tang ◽  
Yong-Qiang He ◽  
Jia-Xun Feng ◽  
Bo-Le Jiang ◽  
...  
Keyword(s):  
Hypersensitive Response ◽  
Xanthomonas Campestris ◽  
Transcriptional Regulator ◽  
Transcriptional Regulators ◽  
Extracellular Protease ◽  
Protease Production ◽  
Phytopathogenic Bacterium ◽  
Cellular Processes ◽  
Glucuronidase Activity ◽  
Nonhost Plant

ABSTRACT The MarR family of transcriptional regulators of bacteria are involved in the regulation of many cellular processes, including pathogenesis. In this work, we have demonstrated genetically that hpaR (hpa, hrp associated), which encodes a putative MarR family regulator, is involved in the hypersensitive response (HR), pathogenicity, and extracellular protease production of the phytopathogenic bacterium Xanthomonas campestris pathovar campestris. A mutation in hpaR resulted in complete loss of virulence in the host plant cabbage, a delayed and weakened HR in the nonhost plant pepper ECW-10R, and an increase in extracellular protease production. Detection of the β-glucuronidase activity of a plasmid-driven hpaR promoter-gusA reporter revealed that the expression of hpaR is positively controlled by HrpG and HrpX and is suppressed in rich medium while being strongly induced in minimal and hrp-inducing media and inside the host. These findings indicate that hpaR belongs to the hrpG and hrpX regulon and that HrpX regulates the extracellular protease production via hpaR in X. campestris pv. campestris.

scholarly journals Reduced Genetic Variation Occurs among Genes of the Highly Clonal Plant Pathogen Xanthomonas axonopodis pv. vesicatoria, Including the Effector Gene avrBs2

2005 ◽  
Vol 71 (5) ◽  
pp. 2418-2432 ◽  
Author(s):  
Gale Wichmann ◽  
David Ritchie ◽  
C. S. Kousik ◽  
Joy Bergelson
Keyword(s):  
Genetic Variation ◽  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Host Plants ◽  
Population Expansion ◽  
Clonal Plant ◽  
Recent Common Ancestor ◽  
Loss Of Function ◽  
Xanthomonas Axonopodis ◽  
Most Recent Common Ancestor

ABSTRACT The bacterial plant pathogen Xanthomonas axonopodis pv. vesicatoria, also known as Xanthomonas campestris pv. vesicatoria group A, is the causal agent of bacterial spot in pepper and tomato. In order to test different models that may explain the coevolution of avrBs2 with its host plants, we sequenced avrBs2 and six chromosomal loci (total of 5.5 kb per strain) from a global sample of 55 X. axonopodis pv. vesicatoria strains collected from diseased peppers. We found an extreme lack of genetic variation among all X. axonopodis pv. vesicatoria genomic loci (average nucleotide diversity, π = 9.1 × 10−5), including avrBs2. This lack of diversity is consistent with X. axonopodis pv. vesicatoria having undergone a recent population bottleneck and/or selective sweep followed by population expansion. Coalescent analysis determined that approximately 1.4 × 104 to 7.16 × 104 bacterial generations have passed since the most recent common ancestor (MRCA) of the current X. axonopodis pv. vesicatoria population. Assuming a range of 50 to 500 bacterial generations per year, only 28 to 1,432 years have passed since the MRCA. This time frame coincides with human intervention with the pathogen's host plants, from domestication to modern agricultural practices. Examination of 19 mutated (loss-of-function) avrBs2 alleles detected nine classes of mutations. All mutations affected protein coding, while no synonymous changes were found. The nature of at least one of the avrBs2 mutations suggests that it may be possible to observe one stage of an evolutionary arms race as X. axonopodis pv. vesicatoria responds to selection pressure to alter avrBs2 to escape host plant resistance.

scholarly journals The Plant Pathogen Xanthomonas campestris pv. campestris Exploits N-Acetylglucosamine during Infection

mBio ◽  
2014 ◽  
Vol 5 (5) ◽  
Author(s):  
A. Boulanger ◽  
C. Zischek ◽  
M. Lautier ◽  
S. Jamet ◽  
P. Rival ◽  
...  
Keyword(s):  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Xanthomonas Campestris Pv Campestris

Gene expression investigations on plant-pathogen interactions between Xanthomonas campestris pv. vesicatoria and pepper ( Capsicum annuum L.) using the cDNA-AFLP technology

2009 ◽  
Vol 57 (2) ◽  
pp. 127-136
Author(s):  
E. Szabó ◽  
G. Bárdos ◽  
I. Nagy
Keyword(s):  
Gene Expression ◽  
Capsicum Annuum ◽  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Expression Profiles ◽  
Expression Patterns ◽  
Bacterial Pathogen ◽  
Sequence Comparisons ◽  
Time Courses ◽  
Plant Pathogen Interactions

In order to target factors involved in plant-pathogen interactions, gene expression differences were investigated on pepper ( Capsicum annuum L.) plants after artificial infection with the bacterial pathogen Xanthomonas campestris pv. vesicatoria . Amplified Fragment Length Polymorphism investigations on reverse transcribed DNA fragments (cDNA-AFLP) were used to compare the expression profiles of parental lines and of resistant and susceptible individuals from pepper populations segregating for the gds gene, which confers a general defence system in pepper. In total, 73 transcript-derived fragments (TDFs) displaying differential expression patterns could be identified (presence-absence and/or different time courses in resistant and susceptible genotypes). Of these, 67 fragments were cloned and sequenced. In the case of several TDFs, sequence comparisons revealed close homologies to genes known to be responsible for abiotic stress or biotic elicitors, presenting potentially interesting targets for more detailed studies on gene expression and signal transduction.

How the bacterial plant pathogen Xanthomonas campestris pv. vesicatoria conquers the host

2000 ◽  
Vol 1 (1) ◽  
pp. 73-76 ◽  
Author(s):  
Ulla Bonas ◽  
Guido Van den Ackerveken ◽  
Daniela Büttner ◽  
Karoline Hahn ◽  
Eric Marois ◽  
...  
Keyword(s):  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Bacterial Plant Pathogen

scholarly journals Characterization of the fimA gene encoding bundle-forming fimbriae of the plant pathogen Xanthomonas campestris pv. vesicatoria.

1997 ◽  
Vol 179 (4) ◽  
pp. 1280-1290 ◽  
Author(s):  
T Ojanen-Reuhs ◽  
N Kalkkinen ◽  
B Westerlund-Wikström ◽  
J van Doorn ◽  
K Haahtela ◽  
...  
Keyword(s):  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Gene Encoding

scholarly journals cDNA-AFLP analysis unravels a genome-wide hrpG-regulon in the plant pathogen Xanthomonas campestris pv. vesicatoria

2001 ◽  
Vol 41 (6) ◽  
pp. 1271-1281 ◽  
Author(s):  
Laurent Noel ◽  
Frank Thieme ◽  
Dirk Nennstiel ◽  
Ulla Bonas
Keyword(s):  
Plant Pathogen ◽  
Xanthomonas Campestris ◽  
Aflp Analysis ◽  
Genome Wide ◽  
A Genome
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