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Identification of genes involved in regulating Mnsod2 production and root colonization in Bacillus cereus 905

Journal of Integrative Agriculture 2021年第6期20卷 1570-1584页

作者： GAO Tan-tan DING Ming-zheng LI Yan ZENG Qing-chao WANG Qi Key Laboratory for Northern Urban Agriculture of Ministry of Agriculture and Rural Affairs Beijing University of AgricultureBeijing 102206P.R.China Department of Plant Pathology College of Plant ProtectionChina Agricultural UniversityBeijing 100193P.R.China

soda2-encoding manganese-containing superoxide dismutase(Mnsod2)in Bacillus cereus 905 plays an essential role in antioxidative stress,nutrition utilization,rhizosphere and phyllosphere ***,the genes involved in regulating the sod a2 expression have not been clearly elucidated in *** this study,a genome-wide random insertion mutagenesis was constructed by using transposon TnYLB-1 to identify novel genes regulating the soda2 *** mutants that changed the soda2 expression at both m RNA and protein levels were finally *** analysis and BLAST data showed that the genes disrupted by TnYLB-1 in *** 905 shared high conservations with those in the *** type strain,ATCC *** genes encode heat-inducible transcription repressor,chloride channel protein,recombinase A,ferrous iron transport protein,nucleoside diphosphate kinase,and histidine ***,we also provided the evidence that the genes regulating the soda2 expression could influence colonization ability of *** 905 on wheat ***,those genes downregulating the soda2 expression significantly reduced bacterial colonization on wheat roots,and mutants with increased Mnsod2 activities could enhance bacterial population densities on wheat roots to a certain *** work provided information that multiple genes are involved in Mnsod2 production and wheat root *** molecular regulatory pathways through which these genes modulate the sod a2 expression and root colonization need to be investigated extensively in the future.

关键词： Bacillus cereus sod a2 TnYLB-1 transposon colonization

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