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Influence of entomopathogenic nematodes, symbiotic bacteria and ascarosides on the dispersal behaviour of Meloidogyne incognita

In: Nematology
Authors:
Kang Dai Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, P.R. China
Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, P.R. China

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Li Cao Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, P.R. China

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Zhihua Huang Yuxi Branch of Yunnan Tobacco Company, Engineering Center for Biological Control of Diseases and Pests in the Tobacco Industry, Yuxi 653100, Yunnan Province, P.R. China

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Xinghui Gu Yuxi Branch of Yunnan Tobacco Company, Engineering Center for Biological Control of Diseases and Pests in the Tobacco Industry, Yuxi 653100, Yunnan Province, P.R. China

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Yonghe Cui Yuxi Branch of Yunnan Tobacco Company, Engineering Center for Biological Control of Diseases and Pests in the Tobacco Industry, Yuxi 653100, Yunnan Province, P.R. China

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Jiangzhou Li Yuxi Branch of Yunnan Tobacco Company, Engineering Center for Biological Control of Diseases and Pests in the Tobacco Industry, Yuxi 653100, Yunnan Province, P.R. China

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Yuling Li Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, P.R. China

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Chengti Xu Academy of Animal Husbandry and Veterinary Sciences, Qinghai University, Xining 810016, P.R. China

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Richou Han Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510260, P.R. China

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https://orcid.org/0000-0002-4120-3803
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Summary

Dispersal is an important behaviour for nematodes. Entomopathogenic nematodes (EPN) are able to regulate plant-parasitic nematodes in the field. However, the mechanism for the interactions between two types of nematodes is not clearly known. The effects of 12 synthesised ascarosides, three EPN species (Steinernema carpocapsae All, Heterorhabditis bacteriophora H06 and H. indica LN2), and 15 symbiotic bacterial isolates from EPN on the dispersal of Meloidogyne incognita were investigated. The results revealed that M. incognita juveniles were repelled, to various degrees, by most of the tested ascarosides (especially ascr#9), three species of EPN, and by bacterial isolates (especially TT01 from H. bacteriophora TT01 and H06 from H. bacteriophora H06), compared with the controls. Ascr#9 was abundant in M. incognita juvenile-conditioned supernatant. This provides useful cues for elucidating the interaction mechanism between two nematode groups and establishing alternative techniques for the safe and effective control of root-knot nematodes.

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