Title:	Screening of bacterial isolates antagonists and suppressors of blast in rice plants.
Authors:	AJULO, A. A. OLIVEIRA, R. S. de BEZERRA, S. F. COSTA, N. B. GONÇALVES, A. R. OLIVEIRA, M. I. de S. FILIPPI, M. C. C. de
Affiliation:	AKINTUNDE ABIODUN AJULO, UNIVERSIDADE FEDERAL DE GOIÁS RODRIGO SILVA DE OLIVEIRA, UNIVERSIDADE FEDERAL DE GOIÁS SORAIA F. BEZERRA NIEDJA BEZERRA COSTA, UNIVERSIDADE ESTADUAL DO MARANHÃO ARIANY ROSA GONÇALVES, FUNDAÇÃO DE APOIO À PESQUISA E AO DESENVOLVIMENTO MAYTHSULENE INACIO DE SOUZA OLIVEIRA, UNIVERSIDADE FEDERAL DE GOIÁS MARTA CRISTINA CORSI DE FILIPPI, CNPAF.
Date Issued:	2024
Citation:	Revista Caatinga, v. 37, e11724, 2024.
Description:	Grain yields of rice (Oryza sativa) are affected globally by rice blast (Magnaporthe oryzae). The main objective of this study was to identify isolates of rhizobacterial antagonists of M. oryzae (BRM10781) and screen the most effective isolates for suppressing rice blast under greenhouse conditions. Two assays (E1 and E2) were performed with 22 treatments in a completely randomized design with three replicates. E1 investigated in vitro antagonism between 21 isolates and M. oryzae under laboratory conditions. The E2 experiments were conducted under greenhouse conditions, with rice cultivar BRS Primavera seeds in plastic trays containing 3 kg of fertilized soil. After 21 days, the rice leaves were spray-inoculated with a bacterial cell suspension (1 × 108 CFU) and M. oryzae (3 × 105 conidia.mL-1) or with water (absolute control). Seven isolates, Serratia marcescens (BRM65918, BRM65923, BRM65926, and BRM63532), Bacillus cereus (BRM65919), Stenotrophomonas nitritireducens (BRM65917), and Priestia megaterium (BRM65929), reduced radial growth of M. oryzae colonies from 80.26 to 77.33%. The best leaf blast severity reducers were Pseudomonas nitroreducens (BRM32112), B. thuringiensis (BRM65928), P. megaterium (BRM65916), S. marcescens (BRM65918), S. nematodiphila (BRM63522), and Enterobacter hormaechei (BRM65925), varying from 97 to 95% respectively. The isolate BRM65918 (S. marcescens) showed the best efficiency for both antagonism and disease suppression, indicating its potential as a bioproduct for the biocontrol of rice blast in rice plants.
Thesagro:	Arroz Oryza Sativa Inoculação Brusone Antagonismo
NAL Thesaurus:	Magnaporthe oryzae Rice Blast disease Inoculation methods
Keywords:	Bioagents Biocontrol Disease suppression Bioagentes Biocontrole Supressão da doença
ISSN:	1983-2125
DOI:	https://doi.org/10.1590/1983-21252024v3711724rc
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CNPAF)