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Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (24): 124-132.doi: 10.11924/j.issn.1000-6850.casb2020-0724

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Interspecific Relationship of Lactobacillus paracasei Co-cultured with Bacillus sp. Affects Bacteriocin Production

Jiang Xueyong1,2(), Yue Yuanchun1, Sun Yangcun1,2, Gao Dongni1,2, Ping Wenxiang1,2, Ge Jingping1,2()   

  1. 1Agricultural Microorganisms Technology Education Engineering Research Center, Harbin 150080
    2Key Laboratory of Microbiology of Heilongjiang Province, Life Science College, Heilongjiang University, Harbin 150500
  • Received:2020-11-30 Revised:2020-12-28 Online:2021-08-25 Published:2021-08-27
  • Contact: Ge Jingping E-mail:jiangxueyong7@126.com;gejingping@126.com

Abstract:

To form a stable ecological environment through interspecific information exchange between Lactobacillus paracasei HD1.7 and Bacillus sp., the initial inoculation amount of Bacillus sp. was increased to study the ecological relationship of Lactobacillus paracasei co-cultured with Bacillus sp.. When Bacillus subtilis was co-cultured with L. paracasei HD1.7 at the initial inoculation ratio of 5%:1%, the bacteriocin produced by L. paracasei HD1.7 was 1.21 times that of monoculture. L. paracasei HD1.7 quorum sensing-related genes luxS, prcK, and prcR were upregulated (up to 3.14, 4.98 and 5.41 folds, respectively) while B. subtilis formed more spores to avoid the attack of bacteriocins. Expression levels of spo0A, sigE, sigF, and sigG, genes related to B. subtilis endospore formation, were correspondingly upregulated (up to 2.37, 2.71, 3.15 and 2.56 folds, respectively). At this time, a cooperative ecological relationship was formed between L. paracasei HD1.7 and Bacillus sp.. The redundancy analysis revealed that the number of spores, incubation time and B. subtilis viable counts were the most closely related to the production of bacteriocin. Different ecological relationships were found between L. paracasei HD1.7 and Bacillus sp., and some Bacillus are beneficial to L. paracasei HD1.7 and some are harmful to it.

Key words: Lactobacillus paracasei, Bacillus sp., co-culture, bacteriocin, interspecific relationship, secondary metabolite, biotic stress

CLC Number: