[Antibacterial activity of lactic acid bacteria community SFC-2 used for fermentation of air-dried crop straws].
OBJECTIVE
To evaluate the antibacterial activity of lactic acid bacteria community SFC-2 in fermented crop straw.


METHODS
Total 13 isolates were obtained from spontaneous fermented rice straw by plating, paper diffusion and Denaturing Gradient Gel Electrophoresis. All these strains were used to determine the antibacterial activity of SFC-2.


RESULTS
(1) Phylogenetic analysis of the 13 strains based on 16S rDNA gene sequence data indicated that 9 strains belong to Enterobacter cloacae, Klebsiella oxytoca, Bacillus cereus, Klebsiella pneumoniae, Citrobacterfreundii, Klebsiella terrigena and Citrobacter sp., which were all common pathogens or opportunistic pathogens. (2) Indicating bacteria selected from the pathogens were used to detect antibacterial activity of SFC-2 cell-free culture supernatant. The results showed that: SFC-2 community had stronger antibacterial activity than isolated strains from SFC-2 community or man-made communities against indicating bacteria. (3) Antibacterial activities of seven different cell-free culture supernatants, which were extracted at intervals from the culture of SFC-2 community during 14-48 hours, were no obvious difference, but the content of organic acids were obvious differences during 14-48 hours; the antibacterial substances were stable after heating and sensitive partly to protease K.
Ma
Jingjing
J
Center of Biomass Engineering, College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China. majingjing0416@126.com
Wang
Xiaofen
X
Gao
Lijuan
L
Cui
Zongjun
Z
D000388:Air; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D018407:Bacterial Physiological Phenomena; D002474:Cell-Free System; D018556:Crops, Agricultural / Q000737:chemistry / Q000378:metabolism* / Q000382:microbiology*; D017077:Culture Media, Conditioned; D004275:DNA, Ribosomal / Q000235:genetics; D003890:Desiccation; D019286:Endopeptidase K / Q000378:metabolism; D005285:Fermentation; D019344:Lactic Acid / Q000096:biosynthesis*; D012275:Oryza / Q000737:chemistry / Q000378:metabolism / Q000382:microbiology; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013696:Temperature; D013997:Time Factors
D017077:Culture Media, Conditioned; D004275:DNA, Ribosomal; D019344:Lactic Acid; D019286:Endopeptidase K