title: 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.
abstract: A total of 2690 actinomycete strains were screened as potential biological control agents in controlling rice bacterial blight (BB) in Vietnam. From these microorganisms, seventeen actinomycete strains were found to be capable of inhibiting all 10 major Xoo races isolated from Xoo-infected rice leaves. One strain, namely VN08-A-12, contained effective characteristics in selectively inhibiting all 10 races in vitro, but did not inhibit most of the other tested microorganisms. Therefore, VN08-A-12 was subsequently selected for rice field trials for two seasons on two rice cultivars SS1 and KD18. Results showed VN08-A-12 was not only able to reduce Xoo lesion lengths in the two rice cultivars (lesion length reduction of up to 38.3%), but it also significantly reduced Xoo-related yield loss in infected rice cultivars from the field (yield loss reduction of up to 43.2%). Interestingly, the culture of this strain also increased the rice yield in healthy rice cultivars (from 2.66% to 16.98% for SS1 and from 3.11% to 5.94% for KD18 cultivar). The strain VN08-A-12 was shown to be identical to Streptomyces toxytricini. To our knowledge, this is the first study reporting S. toxytricini as a beneficial biological agent for the control of BB in rice.
authors.affiliation: Institute of Microbiology and Biotechnology (IMBT), Vietnam National University.
authors.forename: Duong
authors.initials: D
authors.lastname: Van Hop
authors.forename: Phan Thi
authors.initials: PT
authors.lastname: Phuong Hoa
authors.forename: Nguyen Duc
authors.initials: ND
authors.lastname: Quang
authors.forename: Phan Huu
authors.initials: PH
authors.lastname: Ton
authors.forename: Trinh Hoang
authors.initials: TH
authors.lastname: Ha
authors.forename: Nguyen
authors.initials: N
authors.lastname: Van Hung
authors.forename: Nguyen Thi
authors.initials: NT
authors.lastname: Van
authors.forename: Tong
authors.initials: T
authors.lastname: Van Hai
authors.forename: Nguyen Thi
authors.initials: NT
authors.lastname: Kim Quy
authors.forename: Nguyen Thi
authors.initials: NT
authors.lastname: Anh Dao
authors.forename: Vu
authors.initials: V
authors.lastname: Thi Thom
mesh_terms: D000898:Antibiosis; D012275:Oryza / Q000254:growth & development / Q000382:microbiology*; D010572:Pest Control, Biological / Q000379:methods*; D010935:Plant Diseases / Q000382:microbiology*; D012988:Soil Microbiology; D013302:Streptomyces / Q000145:classification / Q000254:growth & development* / Q000302:isolation & purification; D014744:Vietnam; D014974:Xanthomonas / Q000254:growth & development*