期刊
FEMS MICROBIOLOGY LETTERS
卷 366, 期 2, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/femsle/fny287
关键词
Pseudoxanthomonas japonensis; biocontrol; Meloidogyne incognita; nematostatic metabolites
类别
资金
- National Natural Science Foundation Program of China [31260446]
- National Key R&D Programof China [2017YFD0201104]
- Department of Science and Technology of Yunnan Province [2017FA016]
The rhizosphere bacterium ZKB-2 showed strong nematostatic activity against Meloidogyne incognita. Our study aimed to identify the nematostatic metabolites and evaluate the biocontrol efficiency in pot experiments. As the bacterial culture filtrate showed 100% nematostatic activity against M. incognita juveniles in 12 hr, we isolated and identified six compounds following activity guiding. 3-methoxycyclobutane-1, 2-dione showed 58.9% and 72.2% nematostatic activities against juveniles of M. incognita in 12 and 48 hr, with strong LC50 value at 447 mu g mL(-1). In pot experiments, treatments with the bacterial culture filtrate of strain ZKB-2 showed significant efficacy, especially at doses of 150 mL/pot, which were close to that of avermectin (positive control) at 0.01 g kg(-1) soil. The most effective treatment inhibited 85.1% population of juveniles of M. incognita in the roots and 76.9% in the rhizosphere soil after 30 days. Furthermore, the promoting tomato growth also significantly increased in a dose-dependent manner. Our results revealed the potential of strain ZKB-2 to act as a biocontrol agent in the integrated management of root-knot nematodes on tomatoes.
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