scholarly journals Biological Control of Xanthomonas Oryzae pv. Oryzae Causing Rice Bacterial Blight Disease by Streptomyces toxytricini VN08-A-12, Isolated from Soil and Leaf-litter Samples in Vietnam

2014 ◽  
Vol 19 (3) ◽  
pp. 103-111 ◽  
Author(s):  
DUONG VAN HOP ◽  
PHAN THI PHUONG HOA ◽  
NGUYEN DUC QUANG ◽  
PHAN HUU TON ◽  
TRINH HOANG HA ◽  
...  
Keyword(s):  
Biological Control ◽  
Leaf Litter ◽  
Bacterial Blight ◽  
Xanthomonas Oryzae ◽  
Rice Bacterial Blight ◽  
Bacterial Blight Disease ◽  
Blight Disease ◽  
Streptomyces Toxytricini

scholarly journals First method for dissolving zinc thiazole and re-evaluation of its antibacterial properties against rice bacterial blight disease

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Xian Chen ◽  
Lan Zhou ◽  
Pedro Laborda ◽  
Yancun Zhao ◽  
Kaihuai Li ◽  
...  
Keyword(s):  
Cell Wall ◽  
Bacterial Blight ◽  
Antibacterial Properties ◽  
Xanthomonas Oryzae ◽  
Antibacterial Mechanism ◽  
Control Efficacy ◽  
Rice Bacterial Blight ◽  
Bacterial Blight Disease ◽  
Blight Disease ◽  
First Time

Abstract Rice bacterial blight (BB), caused by Xanthomonas oryzae pv. oryzae (Xoo), is one of the most destructive diseases in rice-growing regions worldwide. Zinc thiazole is a novel bactericide and has been applied for BB control for 10 years. However, zinc thiazole is highly insoluble in water and in most organic solvents. In this work, we found for the first time that zinc thiazole can be dissolved in dimethyl sulfoxide (DMSO), and the solubility of zinc thiazole in DMSO is more than 20 mg/mL. Dissolved zinc thiazole at 25 μg/mL significantly inhibited the growth of Xoo by 58.81%. Interestingly, zinc thiazole at 25 μg/mL enhanced the cell division and altered the cell wall integrity of Xoo. The application of dissolved zinc thiazole at 100 μg/mL reduced the incidence of rice bacterial blight (BB) by providing 64.71% control efficacy, while zinc thiazole as suspension concentrate (SC) at 100 μg/mL only provided 43.42% control efficacy. Taken together, this study provides for the first time a method for dissolving zinc thiazole, and may help to better understand the antibacterial mechanism of zinc thiazole.

scholarly journals Genetic and physical analysis of the rice bacterial blight disease resistance locus, Xa21

1992 ◽  
Vol 236 (1) ◽  
pp. 113-120 ◽  
Author(s):  
Pamela C. Ronald ◽  
Beng Albano ◽  
Rodante Tabien ◽  
Lleva Abenes ◽  
Kung-sheng Wu ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Bacterial Blight ◽  
Resistance Locus ◽  
Physical Analysis ◽  
Rice Bacterial Blight ◽  
Bacterial Blight Disease ◽  
Blight Disease

Biological control of rice bacterial blight by plant-associated bacteria producing 2,4-diacetylphloroglucinol

2006 ◽  
Vol 52 (1) ◽  
pp. 56-65 ◽  
Author(s):  
Palaniyandi Velusamy ◽  
J Ebenezar Immanuel ◽  
Samuel S Gnanamanickam ◽  
Linda Thomashow
Keyword(s):  
Biological Control ◽  
Pseudomonas Fluorescens ◽  
Bacterial Blight ◽  
Field Experiments ◽  
Screening Method ◽  
Xanthomonas Oryzae ◽  
Rice Bacterial Blight ◽  
Fluorescent Pseudomonas ◽  
Tn5 Mutants ◽  
Bacterial Blight Pathogen

Certain plant-associated strains of fluorescent Pseudomonas spp. are known to produce the antimicrobial antibiotic 2,4-diacetylphloroglucinol (DAPG). It has antibacterial, antifungal, antiviral, and antihelminthic properties and has played a significant role in the biological control of tobacco, wheat, and sugar beet diseases. It has never been reported from India and has not been implicated in the biological suppression of a major disease of the rice crop. Here, we report that a subpopulation of 27 strains of plant-associated Pseudomonas fluorescens screened in a batch of 278 strains of fluorescent pseudomonads produced DAPG. The DAPG production was detected by a PCR-based screening method that used primers Phl2a and Phl2b and amplified a 745-bp fragment characteristic of DAPG. HPLC,1H NMR, and IR analyses provided further evidence for its production. We report also that this compound inhibited the growth of the devastating rice bacterial blight pathogen Xanthomonas oryzae pv. oryzae in laboratory assays and suppressed rice bacterial blight up to 59%–64% in net-house and field experiments. Tn5 mutants defective in DAPG production (Phl–) of P. fluorescens PTB 9 were much less effective in their suppression of rice bacterial blight.Key words: biocontrol, 2,4-diacetylphloroglucinol, Pseudomonas fluorescens, rice, Xanthomonas oryzae pv. oryzae.

Efficacy of bacteriocinogenic strains of Xanthomonas oryzae pv. oryzae on the incidence of bacterial blight disease of rice (Oryza sativa L.)

1991 ◽  
Vol 37 (10) ◽  
pp. 764-768 ◽  
Author(s):  
N. Sakthivel ◽  
T. W. Mew
Keyword(s):  
Biological Control ◽  
Bacterial Blight ◽  
Oryza Sativa L ◽  
Disease Incidence ◽  
Bacteriocin Production ◽  
Xanthomonas Oryzae ◽  
Control Treatment ◽  
Bacterial Leaf Streak ◽  
Blight Disease ◽  
Greenhouse Tests

A total of 144 isolates of Xanthomonas oryzae pv. oryzae were screened for bacteriocin production against 30 indicator strains of X. oryzae pv. oryzae. Forty isolates showed broad-spectrum inhibitory activity against 20–27 indicators, presumably because of the production of bacteriocin compounds. The selected isolates were screened for bacteriocin production at 29 °C and tested for virulence on rice differentials. Since all of the isolates were pathogenic, nonpathogenic bacteria were generated through N-methyl-N-nitro-N-nitrosoguanidine mutagenesis and by repeated subculturing. Epiphytic colonization and survival of pathogens and of nonpathogenic bacteriocin producers on rice plants were monitored, using mutants resistant to streptomycin and rifampicin. An improved method of pathogen inoculation was developed and used to evaluate biological control. Treatment with nonpathogenic bacteriocin-producing bacteria resulted in reductions of bacterial blight incidence up to 31–99% in greenhouse tests and 11–73% in the screenhouse. Bacterial leaf streak severity was reduced 4–20% in the greenhouse and disease incidence was reduced 20–39% in the screenhouse. Key words: bacteriocin, biological control, Xanthomonas oryzae pv. oryzae, mutagenesis, rice.

A benefit of high temperature: increased effectiveness of a rice bacterial blight disease resistance gene

2009 ◽  
Vol 185 (2) ◽  
pp. 568-576 ◽  
Author(s):  
K. M. Webb ◽  
I. Oña ◽  
J. Bai ◽  
K. A. Garrett ◽  
T. Mew ◽  
...  
Keyword(s):  
Disease Resistance ◽  
High Temperature ◽  
Resistance Gene ◽  
Bacterial Blight ◽  
Disease Resistance Gene ◽  
Rice Bacterial Blight ◽  
Bacterial Blight Disease ◽  
Blight Disease
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