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Characterizing the mode of action of Brevibacillus laterosporus B4 for control of bacterial brown strip of rice caused by A. avenae subsp. avenae RS-1.

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Characterizing the mode of action of Brevibacillus laterosporus B4 for control of bacterial brown strip of rice caused by A. avenae subsp. avenae RS-1.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kakar, Kaleem Ullah Nawaz, Zarqa Cui, Z. Almoneafy, Abdlwareth A. Zhu, Bo Xie, Guan-Lin
Description	Country affiliation: China Author Affiliation: Kakar KU ( State Key Laboratory of Rice Biology, Institute of Biotechnology, Zhejiang University, Hangzhou, 310058, China.)
Abstract	Biological control efficacy of Brevibacillus laterosporus B4 associated with rice rhizosphere was assessed against bacterial brown stripe of rice caused by Acidovorex avenae subsp. avenae. A biochemical bactericide (chitosan) was used as positive control in this experiment. Result of in vitro analysis indicated that B. laterosporus B4 and its culture filtrates (70%; v/v) exhibited low inhibitory effects than chitosan (5 mg/ml). However, culture suspension of B. laterosporus B4 prepared in 1% saline solution presented significant ability to control bacterial brown stripe in vivo. Bacterization of rice seeds for 24 h yielded a greater response (71.9%) for controlling brown stripe in vivo than chitosan (56%). Studies on mechanisms revealed that B. laterosporus B4 suppressed the biofilm formation and severely disrupted cell membrane integrity of A. avenae subsp. avenae, causing the leakage of intracellular substances. In addition, the expression level of virulence-related genes in pathogen recovered from biocontrol-agent-treated plants showed that the genes responsible for biofilm formation, motility, niche adaptation, membrane functionality and virulence of A. avenae subsp. avenae were down-regulated by B. laterosporus B4 treatment. The biocontrol activity of B. laterosporus B4 was attributed to a substance with protein nature. This protein nature was shown by using ammonium sulfate precipitation and subsequent treatment with protease. The results obtained from this study showed the potential effectiveness of B. laterosporus B4 as biocontrol agent in control of bacterial brown stripe of rice.
File Format	HTM / HTML
ISSN	09593993
Issue Number	2
Volume Number	30
e-ISSN	15730972
Journal	World Journal of Microbiology and Biotechnology
Language	English
Publisher	Springer
Publisher Date	2014-02-01
Publisher Place	Germany
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Discipline Microbiology Microbiology Prevention & Control Virulence Comamonadaceae Brevibacillus Pharmacology Metabolism Antibiosis Drug Effects Virulence Factors Anti-bacterial Agents Antagonists & Inhibitors Journal Article Discipline Biotechnology Bacterial Proteins Growth & Development Locomotion Biofilms Oryza Sativa Physiology Plant Diseases
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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Characterizing the mode of action of Brevibacillus laterosporus B4 for control of bacterial brown strip of rice caused by A. avenae subsp. avenae RS-1

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