First report of bacterial panicle blight of rice caused by Burkholderia glumae in southern China.
Bacterial panicle blight of rice (BPBR) caused by Burkholderia glumae, known as grain blight or seedling rot, leads to rice yield losses up to 75% and threatens rice production. In 2007, B. glumae was isolated from symptomless rice seeds in Hainan, China. In 2017, a total 43 panicle samples showing typical symptoms of BPBR with reddish-brown, aborted or partially filled grains and linear lesions on flag-leaf sheaths were collected for bacterial isolation from fields in 15 towns of Guangxi and Guangdong provinces, China (cultivars Longfengyou139, Benyou9901, Baixiangyou 9978, Yaliangyou, Quanyousimiao, etc.). The diseased panicle incidence was about 6.5 to 20% in the field. Based on morphological characteristics, molecular data (16S rRNA gene sequences) and pathogenicity assays, the causal agent was confirmed as B. glumae. This is thought to be the first report of BPBR caused by B. glumae in southern China.