Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (1): 128-140.DOI: 10.3969/j.issn.1004-1524.2022.01.16

• Environmental Science • Previous Articles     Next Articles

Application of rpoB, gyrA and cheA genes in identifying Bacillus genus

YAN Jingting(), QIAO Kai, CAI Yanfei*()   

  1. College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China
  • Received:2021-01-10 Online:2022-01-25 Published:2022-02-05
  • Contact: CAI Yanfei

Abstract:

To determine the discriminatory power of rpoB, gyrA and cheA genes in Bacillus identification,comparative sequence analysis of rpoB, gyrA and cheA genes were conducted through Blast-N algorithm. Based on this, a rapid and accurate identification method for Bacillus genus was proposed.The genomic DNA of a purified strain was extracted and amplified by using specific primers which were selected by the original taxonomy stated on the packaging. Then, the final bacterial taxonomy was determined by sequence identities and phylogenetic analysis. A total of 19 Bacillus isolates were adopted in the present study to verify the feasibility of this proposed method. It was shown that sequence identities of rpoB, gyrA and cheA genes within B. licheniformis and B. subtilis group (including Bacillus subtilis subsp. subtilis,Bacillus subtilis subsp. inaquosorum,Bacillus subtilis subsp. spizizenii), and operational group B. amyloliquefaciens(including Bacillus amyloliquefaciens,Bacillus velezensis) were 84.93%-86.57%,less than 78.21%, and 78.25%-78.58%, respectively.Sequence identities of gyrA and cheA genes within B. subtilis group and operational group B. amyloliquefaciens were 81.01%-95.82% and 94.50%-95.83%, respectively. B.cereus was 94.54% identical to B. thuringiensis by gyrA gene, while B. megaterium was 94.55% identical to B. aryabhattai by cheA gene. It was summarized that B. licheniformis, B. subtilis group and operational group B. amyloliquefaciens could be distinguished by rpoB, gyrA and cheA gene. The subspecies within B. subtilis group and operational group B. amyloliquefaciens could be identified by gyrA and cheA genes. Moreover, gyrA gene was sufficient to distinguish B. cereus from B. thuringiensis, and cheA gene could differentiate B. megaterium from B. aryabhattai.By using the proposed method, 19 Bacillus isolates were identified as Brevibacillus reuszeri,Bacillus mesonae, Bacillus wudalianchiensis,Bacillus massiliogorillae, Bacillus subtilis subsp.subtilis, Bacillus cereus, Bacillus aryabhattai and Bacillus velezensis.

Key words: Bacillus, identification, rpoB, gyrA, cheA

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