• Title/Summary/Keyword: Enterobacter

Search Result 469, Processing Time 0.024 seconds

Isolation and Characterization of Plant Growth Promoting Rhizobacteria From Button Mushroom Compost

  • Oh, Sung-Hoon;Lee, Chang-Jung;Yoon, Min-Ho
    • Korean Journal of Agricultural Science
    • /
    • v.43 no.1
    • /
    • pp.100-108
    • /
    • 2016
  • An auxin-producing bacteria (strain 5-1) was isolated from button mushroom compost in Boryeong-Si, Chungcheongnam-Do. The 5-1 strain was classified as a novel strain of Enterobacter aerogenes based on chemotaxonomic and phylogenetic analyses. The isolated E. aerogenes 5-1 was confirmed to produce indole-3-acetic acid (IAA), one of the auxin hormones, using TLC and HPLC analyses. When the concentration of IAA was assessed by performing HPLC quantitative analysis, a maximum concentration of IAA of $109.9mgL^{-1}$ was detected in the culture broth incubated in R2A medium containing 0.1% L-tryptophan for 24 h at $35^{\circ}C$. Acidification of the culture was deemed caused by an increase of IAA because a negative relationship between IAA production and pH was observed. Supplementation with a known precursor of IAA production, L-tryptophan, appeared to induce maximal production at 0.1% concentration, but it reduced production at concentrations above 0.2%. To investigate the growth-promoting effects to crops, the culture broth of E. aerogenes 5-1 was used to inoculate water cultures and seed pots of mung bean and lettuce. In consequence, adventitious root induction and root growth of mung bean and lettuce were two times higher than those of the control.

Enterobacter cloacae, an Emerging Plant-Pathogenic Bacterium Affecting Chili Pepper Seedlings

  • Garcia-Gonzalez, Tanahiri;Saenz-Hidalgo, Hilda Karina;Silva-Rojas, Hilda Victoria;Morales-Nieto, Carlos;Vancheva, Taca;Koebnik, Ralf;Avila-Quezada, Graciela Dolores
    • The Plant Pathology Journal
    • /
    • v.34 no.1
    • /
    • pp.1-10
    • /
    • 2018
  • A previously unreported bacterial disease on chili pepper (Capsicum annuum L.) seedlings affecting as many as 4% of seedlings was observed in greenhouses in Chihuahua, Mexico (Delicias and Meoqui counties). Initial lesions appeared as irregular small spots on leaves and brown necrosis at margins tips were observed. Later, the spots became necrotic with a chlorotic halo. Advanced disease was associated with defoliation. A Gram negative, rod-shaped bacterium was isolated from diseased chili pepper seedlings. Three inoculation methods revealed that isolated strains produce foliage symptoms, similar to those observed in naturally infected seedlings. Pathogenic strains that caused symptoms in inoculated seedlings were re-isolated and identified to fulfill koch's postulate. Polyphasic approaches for identification including biochemical assays (API 20E and 50CH), carbon source utilization profiling (Biolog) and 16S rDNA, hsp60 and rpoB sequence analysis were done. Enterobacter cloacae was identified as the causal agent of this outbreak on chili pepper seedlings.

Bacterial Distribution in Dried Salted Marine Products, Sold in Garak Wholesale Market (시판 조미건어포류 식품의 위생세균 분포)

  • Ham Hee-Jin;Kim Ae-Kyung;Kim Moo-Sang
    • Journal of Food Hygiene and Safety
    • /
    • v.21 no.2
    • /
    • pp.70-75
    • /
    • 2006
  • Of 111 bacterial isolates on 32 dried salted marine products in Garak wholesale market.72 strains were coliforms, and 12 were staphylococcus spp. etc. In average, humidity 17.28%, ashes 4.92%, standard plate count $1.1{\times}10^7$ CFU/ml, coliforms count $9.0{\times}10^3$ CFU/ml, staphylococcus spp. $5.4{\times}10^6$ CFU/ml respectively. Of 72 coliforms, it was isolated by 21 Pantoea spp, 14 Enterobacter cloacae and, 13 Ranella aquatilis, etc. and of 12 Staphylococcus spp. 4 staphylococcus xylosus was the most.

Early-onset sepsis in a neonatal intensive care unit in Beni Suef, Egypt: bacterial isolates and antibiotic resistance pattern

  • Fahmey, Sameh Samir
    • Clinical and Experimental Pediatrics
    • /
    • v.56 no.8
    • /
    • pp.332-337
    • /
    • 2013
  • Purpose: To identify the frequency of bacterial isolates in early-onset neonatal sepsis (EONS) and their antimicrobial resistance pattern. Methods: A retrospective study of EONS was conducted at the Beni Suef University Hospital from September 2008 to September 2012. A case of EONS was defined as an infant who had clinical signs of infection or who was born to a mother with risk factors for infection, and in whom blood culture obtained within 72 hours of life grew a bacterial pathogen. Results: Of 673 neonates screened, there were 138 positive blood cultures (20.5%) (confirmed EONS). Of the recovered isolates, 86.2% were gram-negative pathogens. Klebsiella pneumoniae (42.8%), Enterobacter cloacae (22.5%), and Escherichia coli (13.8%) were the commonest isolated organisms. The most common gram-positive microorganism was Staphylococcus aureus accounting for only 12 isolates (8.7%). All Klebsiella isolates and 93% of Enterobacter isolates were resistant to ampicillin. Gram-negative pathogens had the maximum overall sensitivity to imipenem, cefepime, and ciprofloxacin; whereas, gram-positive isolates were most susceptible to vancomycin, imipenem, and piperacillin. Conclusion: K. pneumoniae was the predominant causative bacteria of EONS followed by E. cloacae and E. coli. There was a high resistance to ampicillin. Imipenem had the maximum overall activity against the causative bacteria. Continuous surveillance is needed to monitor the changing epidemiology of pathogens and antibiotic sensitivity.

Effect of cyclodextrin glucanotransferase enzyme in biodegradation of diesel oil

  • Sivaraman, C.;Ganguly, Anasuya;Mutnuri, Srikanth
    • Advances in environmental research
    • /
    • v.1 no.2
    • /
    • pp.97-108
    • /
    • 2012
  • Microbial degradation of hydrocarbons is found to be an attractive process for remediation of contaminated habitats. However the poor bioavailability of hydrocarbons results in low biodegradation rates. Cyclodextrins are known to increase the bioavailability of variety of hydrophobic compounds. In the present work we purified the Cyclodextrin Glucanotransferase (CGTase) enzyme which is responsible for converting starch into cyclodextrins and studied its role on biodegradation of diesel oil contaminated soil. Purification of CGTase from Enterobacter cloacae was done which resulted in 6 fold increase in enzyme activity. The enzyme showed maximum activity at pH 7, temperature $60^{\circ}C$ with a molecular weight of 66 kDa. Addition of purified CGTase to the treatment setup with Pseudomonas mendocina showed enhanced biodegradation of diesel oil ($57{\pm}1.37%$) which was similar to the treatment setup when added with Pseudomonas mendocina and Enterobacter cloacae ($52.7{\pm}6.51%$). The residual diesel oil found in treatment setup added with Pseudomonas mendocina at end of the study was found to be $73{\pm}0.21%$. Immobilization of Pseudomonas mendocina on alginate containing starch also led to enhanced biodegradation of hydrocarbons in diesel oil at 336 hours.