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Antifungal Effect of Antagonistic Bacteria Isolated from the Froth of Spittlebug Poophilus costalis Against Phytopathogenic Fungi
Antagonistic bacteria <i>Stenotrophomonas maltophilia</i> AY (A) and <i>Delftia tsuruhatensis</i> DT (B) were isolated from the froth of spittlebug <i>Poophilus costalis</i> and grown on lysogeny broth (LB) medium.
Antagonistic bacteria Stenotrophomonas maltophilia AY (A) and Delftia tsuruhatensis DT (B) were isolated from the froth of spittlebug Poophilus costalis and grown on lysogeny broth (LB) medium.

Author:Shu-Chen Chang, Hsien-Tzung Shih, Jyh-Nong Tsai, Tsung-Chun Lin, and Kuang-Hui Lu*

Abstract:

    For no fungi growing on the froth of spittlebug in field, the antifungal effect and chitinase activity of the bacteria isolated from the froth of Poophilus costalis (Walker, 1851) were analyzed in this study. Two isolates of bacteria had high antagonistic activities against Fusarium oxysporum f. sp. pisi and Colletotrichum gloeosporioides Penz were identified as Stenotrophomonas maltophilia AY and Delftia tsuruhatensis DT by 16S rDNA and chitinase gene sequences. S. maltophilia AY produced 1.1, 19.9, and 19.1 nmol p-nitrophenol min-1 mg-1 protein of exochitinase β-N-actylglucosaminidase, chitobiosidase and endochitinase, respectively. These two antagonistic bacteria may have the application potential on pathogenic control in the future.

Key words:Stenotrophomonas maltophilia, Delftia tsuruhatensis, Chitinase, Antifungal effect

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Journal of
Taiwan Agricultural Research
Vol. 73, No.1 (2024) ISSN: 2790-086X Vol. 73, No.1 (2024)
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