长白山原始森林土壤源耐低温乳酸菌的筛选

doi:10.16431/j.cnki.1671-7236.2020.10.008

Abstract

Abstract: The purpose of the experiment was to screen psychrotrophic lactic acid bacteria with strong stress-resistant growth ability,acid production ability and good bacteriostatic characteristics in vitro,and analyze its related biological characteristics,so as to provide excellent psychrotrophic lactic acid bacteria resources for low temperature silage in Northeast China.The culture condition of 10 ℃ was used to screen the psychrotrophic lactic acid bacteria.After the determination of the growth characteristics of Lactobacillus under different pH,temperature and salinity conditions,the species identification of the candidate strains was carried out,and the growth curve,acid production curve,acid and bile salt resistance,bacteriostatic performance and feeding test of mice were conducted for the candidate strains.The results showed that 11 strains of psychrotrophic lactic acid bacteria could grow well at 10 ℃.The strains C37,C34 and C4212 were identified as Lactobacillus plantarum by 16S rRNA sequencing analysis.The pH of C37,C34 and C4212 decreased to below 4.25 after 7 days of culture.In addition,C37,C34 and C4212 could grow well at 4 ℃,45 ℃,pH 3.0 and 6.5% NaCl.The analysis of growth curve showed that the three strains of Lactobacillus all had a fast growth rate,entered the logarithmic growth period at 4 h,and entered the stable growth period in 10-12 h after inoculation.In the aspect of acid production rate,C37,C34 and C4212 could reduce pH below 4.04 at 24 h of culture.At pH 3.0,C37 and C4212 had a high survival rate,they all had a certain tolerance to 0.5% bile salt,and the survival rate was more than 80%.C37,C34 and C4212 had inhibitory effect on enterotoxin producing Escherichia coli,Salmonella Typhimurium,Staphylococcus aureus and Salmonella Enteritis,and the animal test of three Lactobacillus plantarum were safe.Based on the results of this experiment,Lactobacillus C37,C34 and C4212 were screened and identified from the forest soil of Changbai Mountain,which could provide excellent lactic acid bacteria resources for low temperature silage in winter in Northeast China.

Key words: psychrotrophic lactic acid bacteria; screening; Lactobacillus plantarum; silage; biological characteristics

CLC Number:

Q939.11⁺7

CHEN Long, WEI Bingdong, ZHENG Lin, ZHANG Ying, YAN Xiaogang, YU Wei. Screening of Pychrotrophic Lactic Acid Bacteria from Changbai Mountain Soil[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(10): 3103-3113.

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Screening of Pychrotrophic Lactic Acid Bacteria from Changbai Mountain Soil

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