Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 169, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2020.104669
Keywords
Surfactin A; Defense responses; Rice; Xanthomonas oryzae pv. oryzae
Categories
Funding
- Program of Hainan Association for Science and Technology Plans to Youth RD Innovation [QCXM201903]
- National Natural Science Foundation of China [31960552]
- Scientific Research Foundation for Advanced Talents, Hainan University [KYQD (ZR)1842]
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Xanthomonas oryzae pv. oryzae (Xoo) is an important pathogen in rice. C(15)surfactin A, produced by Bacillus velezensis HN-2, displayed antibacterial activity against Xoo and effectively inhibited its infection of rice. The median inhibitory concentration of C(15)surfactin A was 9.27 mu g/mL. Scanning electron and transmission electron microscopy examination showed that C(15)surfactin A caused significant damage to the cell wall structure of Xoo cells. On the other hand, dramatic increases in the activity of phenylalanine ammonia-lyase (Pal) and H2O2 content were observed in rice leaves inoculated with Xoo from 0 h to 72 h. Quantitative PCR assays indicated that C(15)surfactin A exposure upregulated the expression of the genes Pr1a, CatA, and Pal. The results showed that C(15)surfactin A could inhibit the growth of Xoo and effectively induce rice resistance to Xoo by triggering a hypersensitive reaction (HR) via mediation of the activities of antioxidant-related enzymes. Taken together, C(15)surfactin A has strong antibiotic activity against Xoo and effectively induces rice resistance to Xoo. These results highlight the potential of C(15)surfactin A as a biocontrol agent against Xoo in rice.
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