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Rice Bacterial Foot Rot Disease Caused by Dickeya zeae in Taiwan
Symptoms of different crops inoculated with <i>Dickeya Zeae</i> strain Ech1218. (A) Two weeks after inoculation on rice seedlings, (B) four days after inoculation on maize, (C) one day after inoculation on potato slices, (D) four days after inoculation on carrots, (E) one day after inoculation on Chinese cabbages, and (F) three days after inoculation on onion. Arrows indicate the inoculation sites.
Symptoms of different crops inoculated with Dickeya Zeae strain Ech1218. (A) Two weeks after inoculation on rice seedlings, (B) four days after inoculation on maize, (C) one day after inoculation on potato slices, (D) four days after inoculation on carrots, (E) one day after inoculation on Chinese cabbages, and (F) three days after inoculation on onion. Arrows indicate the inoculation sites.

Author:Ching-Yi Lin, Chiao-Wen Huang, Hong-Ren Yang, Chia-Hsin Tsai, Sui-Li Hsu, and Hui-Fang Ni*

Abstract:

    Rice bacterial foot rot is a new bacterial disease of rice found in Taiwan recently. Symptoms of the disease include brown sheath rot and dark brown decay of the tillers. The diseased samples were collected in Chiayi County and bacteria were isolated from the symptomatic tissues. Pathogenicity of the bacteria was verified by Koch’s postulates. The pathogen was further determined as Dickeya zeae by Biolog identification and multi-gene (16S rDNA, gyrB, and dnaX) sequence analysis. The pathogen could also infect several important crops such as maize, potato, carrots and Chinese cabbage. It could grow at wide range of temperatures, 10–40℃, with optimal range in 30–35℃. The selected 26 rice varieties were all infected by the pathogen. Among these tested varieties, japonica rice variety, ‘TK8’ was most susceptible to the pathogen, with an average incidence of 94.44%. An In vitro agrochemical screening test showed that 20% oxolinic was the most effective inhibitor on bacterial growth. A greenhouse trial showed that the chemical could only protect the rice plants if applied before the pathogen infection. The results suggested that 20% oxolinic could be recommended as an effective chemical to control the rice bacterial foot rot disease in the field.

Key words:Rice, Rice bacterial foot rot, Agrochemical screening.

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Journal of
Taiwan Agricultural Research
Vol. 72, No.3 (2023) ISSN: 2790-086X Vol. 72, No.3 (2023)
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