scholarly journals Serological Specificity of Xanthomonas oryzae, Incitant of Bacterial Blight of Rice

1977 ◽  
Vol 27 (4) ◽  
pp. 383-385 ◽  
Author(s):  
I. C. MAHANTA ◽  
S. K. ADDY
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Bacterial Blight Of Rice ◽  
Serological Specificity

scholarly journals The Role of a Host-Induced Arginase of Xanthomonas oryzae pv. oryzae in Promoting Virulence on Rice

2019 ◽  
Vol 109 (11) ◽  
pp. 1869-1877
Author(s):  
Yuqiang Zhang ◽  
Guichun Wu ◽  
Ian Palmer ◽  
Bo Wang ◽  
Guoliang Qian ◽  
...  
Keyword(s):  
Biofilm Formation ◽  
Bacterial Blight ◽  
Wild Type Strain ◽  
Bacterial Pathogen ◽  
Extracellular Polysaccharide ◽  
Rice Cultivar ◽  
Xanthomonas Oryzae ◽  
Wild Type ◽  
Bacterial Blight Of Rice

The plant bacterial pathogen Xanthomonas oryzae pv. oryzae causes bacterial blight of rice, which is one of the most destructive rice diseases prevalent in Asia and parts of Africa. Despite many years of research, how X. oryzae pv. oryzae causes bacterial blight of rice is still not completely understood. Here, we show that the loss of the rocF gene caused a significant decrease in the virulence of X. oryzae pv. oryzae in the susceptible rice cultivar IR24. Bioinformatics analysis demonstrated that rocF encodes arginase. Quantitative real-time PCR and Western blot assays revealed that rocF expression was significantly induced by rice and arginine. The rocF deletion mutant strain showed elevated sensitivity to hydrogen peroxide, reduced extracellular polysaccharide (EPS) production, and reduced biofilm formation, all of which are important determinants for the full virulence of X. oryzae pv. oryzae, compared with the wild-type strain. Taken together, the results of this study revealed a mechanism by which a bacterial arginase is required for the full virulence of X. oryzae pv. oryzae on rice because of its contribution to tolerance to reactive oxygen species, EPS production, and biofilm formation.

Allelochemical catechol comprehensively impedes bacterial blight of rice caused by Xanthomonas oryzae pv. oryzae

2020 ◽  
Vol 149 ◽  
pp. 104559
Author(s):  
Kumari Vishakha ◽  
Shatabdi Das ◽  
Satarupa Banerjee ◽  
Sandhimita Mondal ◽  
Arnab Ganguli
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Bacterial Blight Of Rice

scholarly journals Genome Resource of a Hypervirulent Strain LN4 of Xanthomonas oryzae pv. oryzae Causing Bacterial Blight of Rice

Plant Disease ◽  
2020 ◽  
Vol 104 (11) ◽  
pp. 2764-2767
Author(s):  
Zhengyin Xu ◽  
Sai Wang ◽  
Liang Liu ◽  
Yangyang Yang ◽  
Bo Zhu ◽  
...  
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Nanopore Sequencing ◽  
Transcription Activator ◽  
Rice Varieties ◽  
Single Chromosome ◽  
Coding Sequences ◽  
Genome Data ◽  
Bacterial Blight Of Rice ◽  
Virulence Effectors

Xanthomonas oryzae pv. oryzae is the causative agent of bacterial blight of rice and causes severe harvest loss and challenges to a stable food supply globally. In this study, a hypervirulent strain, LN4, compatible in rice varieties carrying Xa3, Xa4, xa13, and xa25 resistance genes, was used to generate DNA for nanopore sequencing. After assembly, the genome comprises a single chromosome of 5,012,583 bp, consisting of a total of 6,700 predicted coding sequences. Seventeen transcription activator-like effectors (TALEs) were encoded in the genome, of which two (Tal7 and Tal6c) were major TALEs. The approach and genome data provide information for the discovery of new virulence effectors and understanding of the virulence mechanism of TALEs in rice.

scholarly journals Mutagenesis of 18 Type III Effectors Reveals Virulence Function of XopZPXO99 in Xanthomonas oryzae pv. oryzae

2010 ◽  
Vol 23 (7) ◽  
pp. 893-902 ◽  
Author(s):  
Congfeng Song ◽  
Bing Yang
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Host Cells ◽  
Lesion Length ◽  
Transcription Activator ◽  
Tal Effectors ◽  
Type Iii ◽  
Effector Genes ◽  
Acid Protein ◽  
Bacterial Blight Of Rice

Xanthomonas oryzae pv. oryzae depends on a type III secretion system (T3SS) to translocate effectors into host cells for its ability to cause bacterial blight of rice. All type III (T3) effectors with known function in X. oryzae pv. oryzae belong to a family of transcription activator-like (TAL) effectors. However, other, non–TAL-related effector genes are present in the genome, although their role in virulence and their mode of action have yet to be elucidated. Here, we report the generation of mutants for 18 non-TAL T3 effector genes and the identification of one that contributes to the virulence of strain PXO99A. XopZPXO99 encodes a predicted 1,414-amino-acid protein of unknown function. PXO99A contains two identical copies of the gene due to a duplication of 212 kb in the genome. Strains with knockout mutations of one copy of XopZPXO99 did not exhibit any visible virulence defect. However, strains with mutations in both copies of XopZPXO99 displayed reduced virulence in terms of lesion length and bacterial multiplication compared with PXO99A. The introduction of one genomic copy of XopZPXO99 restores the mutant to full virulence. Transient expression of XopZPXO99 in Nicotiana benthamiana leaves suppresses host basal defense, which is otherwise induced by a T3SS mutant of PXO99A, suggesting a role for XopZPXO99 in interfering with host innate immunity during X. oryzae pv. oryzae infection. XopZPXO99-related genes are found in all Xanthomonas spp. whose genomic sequences have been determined, suggesting a conserved role for this type of effector gene in pathogenesis of Xanthomonas spp. Our results indicate that XopZPXO99 encodes a novel T3 effector and contributes virulence to X. oryzae pv. oryzae strains for bacterial blight of rice.

scholarly journals In silico model of DSF synthase RpfF protein from Xanthomonas oryzae pv. Oryzae: A novel target for bacterial blight of rice disease

2012 ◽  
Vol 8 (11) ◽  
pp. 504-507 ◽  
Author(s):  
Vidavaluru Sravani Reddy ◽  
Yellapu Nanda Kumar ◽  
Aminedi Raghavendra ◽  
Gopal Sowjenya ◽  
Suman Kumar ◽  
...  
Keyword(s):  
In Silico ◽  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
In Silico Model ◽  
Rice Disease ◽  
Bacterial Blight Of Rice ◽  
Novel Target

Genotypic and Pathotypic Diversity of Xanthomonas oryzae pv. oryzae, the Cause of Bacterial Blight of Rice in Punjab State of India

2011 ◽  
Vol 159 (7-8) ◽  
pp. 479-487 ◽  
Author(s):  
Jagjeet S. Lore ◽  
Yogesh Vikal ◽  
Mandeep S. Hunjan ◽  
Ravinder K. Goel ◽  
Tajinder S. Bharaj ◽  
...  
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Bacterial Blight Of Rice

Primary Disease Gradients of Bacterial Blight of Rice

1999 ◽  
Vol 89 (1) ◽  
pp. 64-67 ◽  
Author(s):  
Christopher C. Mundt ◽  
Hafiz U. Ahmed ◽  
Maria R. Finckh ◽  
Lorna P. Nieva ◽  
Rizal F. Alfonso
Keyword(s):  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Random Pattern ◽  
Primary Disease ◽  
Splash Dispersal ◽  
Dispersal Potential ◽  
Oryzae Sativa ◽  
Bacterial Blight Of Rice ◽  
Steep Slopes ◽  
Gradient Models

The dispersal potential of Xanthomonas oryzae pv. oryzae, causal agent of bacterial blight of rice (Oryzae sativa), was investigated through measurement of primary disease gradients. Plants within individual hills of rice were inoculated, and the number of new lesions in the primary generation of dispersal from these inoculated sources was counted. Two dispersal models that can describe the number of infections at the source (the Kiyosawa and Shiyomi and the modified Gregory) were fit to the lesion counts. Estimated gradient slopes were similar in the 2 years of the study for both gradient models. However, the Kiyosawa and Shiyomi model gave a better fit in both years, as indicated by higher coefficients of determination and significances of slopes and by a more random pattern of residuals. Primary disease gradients were very steep, with half-distances (distances over which lesion numbers are calculated to decrease by half) estimated from the Kiyosawa and Shiyomi model of 0.091 and 0.081 m in 1994 and 1995, respectively. Splash dispersal of X. oryzae pv. oryzae is the most likely explanation for both the steep slopes measured and the superior fit of the Kiyosawa and Shiyomi model over the modified Gregory model.

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