Abstract
Bacterial palea browning of rice, caused by Pantoea ananatis from infection during flowering, occurs widely in Japan and degrades the quality of rice. In a search for environmentally friendly control measures, effects of bacteriophages on the incidence of the disease were examined. Phages lytic to both pathogenic and nonpathogenic P. ananatis were isolated from an inflorescence of eulalia (Miscanthus sinensis), a gramineous weed, and one of the phages was sprayed with and without a nonpathogenic isolate of P. ananatis on rice plants at the flowering stage. Coapplication of the phage and nonpathogenic P. ananatis suppressed the disease in sunlight. Surprisingly, application of the light-labile phage by itself was suppressive. The phage retarded the growth of the pathogen on rice plants and on LB medium. Because nonpathogenic Pantoea strains are abundant on rice panicles at the flowering stage and could be hosts of the phage and the optimum infection period of rice with P. ananatis is during the flowering stage, disease suppression by the phage is thought to be due to the combined effects of the phage, naturally inhabiting nonpathogenic bacteria, and the limited susceptible period.
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Azegami, K. Suppressive effect of bacteriophage on bacterial palea browning of rice caused by Pantoea ananatis . J Gen Plant Pathol 79, 145–154 (2013). https://doi.org/10.1007/s10327-013-0435-9
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DOI: https://doi.org/10.1007/s10327-013-0435-9