Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (18): 138-146.doi: 10.11924/j.issn.1000-6850.casb2020-0605

Special Issue: 植物保护 马铃薯

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Biocontrol Bacteria Against Ditylenchus destructor: Screening and Identification

Zhang Niu1(), Wang Dong1(), Zhao Yuanzheng2, Xiang Peng3, Qiu Tingyan4, Zhao Xin1, Gao Tengda4, Gao Zhichao4, Zhou Hongyou1()   

  1. 1College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010018
    2Institute of Plant Protection, Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences, Hohhot 010031
    3Heihe Branch of Heilongjiang Academy of Agricultural Sciences, Heihe Heilongjiang 164312
    4Plant Protection and Plant Quarantine Station, Agricultural and Pastoral Bureau of Karakqin Banner, Karakqin Banner Inner Mongolia 024409
  • Received:2020-10-30 Revised:2021-02-19 Online:2021-06-25 Published:2021-07-13
  • Contact: Wang Dong,Zhou Hongyou E-mail:1715499521@qq.com;wangdong@imau.edu.cn;hongyouzhou2002@aliyun.com

Abstract:

The objective is to develop bioagent resources with high nematicidal activity to control Ditylenchus destructor. Fermentation broths of 34 bacterial strains were used to test their contact activities against D. destructor by direct contact method. The classification status of biocontrol bacteria were identified based on colony phenotype, physiological and biochemical characteristics and 16S rDNA gene sequence. The results showed that 9 biocontrol bacteria with high contact activity were screened and could lead to D. destructor with 72.36%-82.59% corrected mortality after being treated with their fermentation broths for 48 h. Strains Chi9-7, Nong3-5, Nong5-6 and b1-3 were identified as Bacillus subtilis. b5-4 was B. velezensis, and Chi9-2, Xia4-11, Gu4-7 and Z-1 were B. amyloliquefaciens. In this study, 9 Bacillus strains with obvious nematicidal effect were screened and identified, which could provide novel biocontrol resources for the development of microbial nematicides and lay a foundation for the effective control of D. destructor.

Key words: Ditylenchus destructor, Bacillus spp., contact activity, physiological and biochemical characteristics, 16S rDNA

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