scholarly journals Antimicrobial Mitigation via Saponin Intervention on Escherichia coli and Growth and Development of Hydroponic Lettuce

2021 ◽  
pp. 1-7
Author(s):  
Nathan J. Eylands ◽  
Michael R. Evans ◽  
Angela M. Shaw
Keyword(s):  
Escherichia Coli ◽  
Plant Growth ◽  
Growth And Development ◽  
Negative Impact ◽  
Pathogenic Fungi ◽  
E Coli ◽  
Yucca Schidigera ◽  
Nutrient Film Technique ◽  
Bactericidal Effects ◽  
Shoot Weight

Various saponins have demonstrated allelochemical effects such as bactericidal impacts as well as antimycotic activity against some plant pathogenic fungi, thereby acting to benefit plant growth and development. A commercial saponin solution was evaluated for bactericidal effects against Escherichia coli and growth of lettuce (Lactuca sativa) in a hydroponic system. E. coli (P4, P13, and P68) inoculum at final concentration of 108 colony-forming units (cfu)/mL was added to 130 L of a fertilized solution recirculating in a nutrient film technique (NFT) system used to grow ‘Rex’ lettuce. After 5 weeks in the NFT system, E. coli populations were lowest in the inoculated treatment that did not contain any saponin addition (0.89 log cfu/mL) when compared with all other inoculated treatments (P < 0.001). The treatment containing 100 µg·mL−1 saponin extract had an E. coli population of 4.61 log cfu/mL after 5 weeks that was higher than treatments containing 25 µg·mL−1 or less (P < 0.0001). Thus, higher E. coli populations were observed at higher saponin concentrations. Plant growth was also inhibited by increasing saponin concentrations. Fresh and dry shoot weight were both higher in the inoculated and uninoculated treatments without the saponin addition after 5 weeks in the NFT system (P < 0.0001). Lettuce head diameter was smaller when exposed to saponin treatments with concentrations of 50 and 100 µg·mL−1 (P < 0.0001). Lettuce leaves were also tested for the potential of E. coli to travel systemically to the edible portions of the plant. No E. coli was found to travel in this manner. It was concluded that steroidal saponins extracted from mojave yucca (Yucca schidigera) are not an acceptable compound for use in mitigation of E. coli in hydroponic fertilizer solution due to its ineffectiveness as a bactericide and its negative impact on lettuce growth.

scholarly journals Establishment of Strigolactone-Producing Bacterium-Yeast Consortium

2021 ◽  
Author(s):  
Sheng Wu ◽  
Xiaoqiang Ma ◽  
Anqi Zhou ◽  
Alex Valenzuela ◽  
Yanran Li ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Saccharomyces Cerevisiae ◽  
Plant Growth ◽  
Production Process ◽  
Growth And Development ◽  
Pathway Engineering ◽  
Biosynthetic Enzymes ◽  
Functional Identification ◽  
Plant Growth And Development ◽  
Microbial System

Strigolactones (SLs) are a class of phytohormones playing diverse roles in plant growth and development, yet the limited access to SLs is largely impeding SL-based foundational investigations and applications. Here, we developed Escherichia coli-Saccharomyces cerevisiae consortia to establish a microbial biosynthetic platform for the synthesis of various SLs, including carlactone, carlactonic acid, 5-deoxystrigol (5DS), 4-deoxyorobanchol (4DO), and orobanchol (OB). The SL-producing platform enabled us to conduct functional identification of CYP722Cs from various plants as either OB or 5DS synthase. It also allowed us to quantitatively compare known variants of plant SL biosynthetic enzymes in the microbial system. The titer of 5DS was further enhanced through pathway engineering to 0.0473 mg/L. This work provides a unique platform for investigating SL biosynthesis and evolution and lays the foundation for developing SL microbial production process.

scholarly journals Advantage of the F2:A1:B- IncF Pandemic Plasmid over IncC Plasmids in In Vitro Acquisition and Evolution of blaCTX-M Gene-Bearing Plasmids in Escherichia coli

2019 ◽  
Vol 63 (10) ◽  
Author(s):  
Anne-Claire Mahérault ◽  
Harry Kemble ◽  
Mélanie Magnan ◽  
Benoit Gachet ◽  
David Roche ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Experimental Evolution ◽  
Negative Impact ◽  
Fitness Cost ◽  
M Gene ◽  
Content Type ◽  
E Coli ◽  
Conjugative Plasmids ◽  
K 12

ABSTRACT Despite a fitness cost imposed on bacterial hosts, large conjugative plasmids play a key role in the diffusion of resistance determinants, such as CTX-M extended-spectrum β-lactamases. Among the large conjugative plasmids, IncF plasmids are the most predominant group, and an F2:A1:B- IncF-type plasmid encoding a CTX-M-15 variant was recently described as being strongly associated with the emerging worldwide Escherichia coli sequence type 131 (ST131)-O25b:H4 H30Rx/C2 sublineage. In this context, we investigated the fitness cost of narrow-range F-type plasmids, including the F2:A1:B- IncF-type CTX-M-15 plasmid, and of broad-range C-type plasmids in the K-12-like J53-2 E. coli strain. Although all plasmids imposed a significant fitness cost to the bacterial host immediately after conjugation, we show, using an experimental-evolution approach, that a negative impact on the fitness of the host strain was maintained throughout 1,120 generations with the IncC-IncR plasmid, regardless of the presence or absence of cefotaxime, in contrast to the F2:A1:B- IncF plasmid, whose cost was alleviated. Many chromosomal and plasmid rearrangements were detected after conjugation in transconjugants carrying the IncC plasmids but not in transconjugants carrying the F2:A1:B- IncF plasmid, except for insertion sequence (IS) mobilization from the fliM gene leading to the restoration of motility of the recipient strains. Only a few mutations occurred on the chromosome of each transconjugant throughout the experimental-evolution assay. Our findings indicate that the F2:A1:B- IncF CTX-M-15 plasmid is well adapted to the E. coli strain studied, contrary to the IncC-IncR CTX-M-15 plasmid, and that such plasmid-host adaptation could participate in the evolutionary success of the CTX-M-15-producing pandemic E. coli ST131-O25b:H4 lineage.

Glyphosate Can Reduce Glyphosate-resistant Canola Growth After Individual or Sequential Applications

2006 ◽  
Vol 20 (4) ◽  
pp. 825-830 ◽  
Author(s):  
Brian S. Schilling ◽  
K. Neil Harker ◽  
Jane R. King
Keyword(s):  
Plant Growth ◽  
Leaf Area ◽  
Growth And Development ◽  
Growth Stage ◽  
Growth Parameters ◽  
Growth Parameter ◽  
Leaf Stage ◽  
Greenhouse Experiments ◽  
Three Stages ◽  
Shoot Weight

Greenhouse experiments were conducted to determine whether multiple applications of glyphosate and time of glyphosate application with regard to the crop's growth stage had a significant effect on the growth and development of glyphosate-resistant canola. Glyphosate was applied as single applications at the two-, four-, or six-leaf stage of canola; as sequential double applications at the two- and four-, two- and six-, and four- and six-leaf stages of canola; and as a triple application at all three stages. Of the plant growth parameters measured, single applications of glyphosate resulted in significant reductions to stem weight and shoot weight compared with nontreated plants, and multiple applications of glyphosate caused significant reductions to leaf area, leaf weight, stem weight, and shoot weight. Single applications of glyphosate were less injurious to glyphosate-resistant canola compared with multiple applications, and canola growth parameter reductions were greatest after earlier glyphosate applications.

scholarly journals Plant Growth Promoting Potentials of Beneficial Endophytic Escherichia coli USML2 in Association with Rice Seedlings

2021 ◽  
Vol 32 (1) ◽  
pp. 117-141
Author(s):  
Munirah Tharek ◽  
◽  
Dzulaikha Khairuddin ◽  
Nazalan Najimudin ◽  
Amir Hamzah Ghazali ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Plant Growth ◽  
Elaeis Guineensis ◽  
Growth Promotion ◽  
Soil Conditions ◽  
Rice Seedlings ◽  
Shoot Height ◽  
E Coli ◽  
Plant Growth Promoting ◽  
Growth Promoting

An endophytic Escherichia coli USML2 originally isolated from the inner part of an oil palm (Elaeis guineensis Jacq.) leaf tissue was inoculated to rice seedlings to investigate its ability in colonising plant inner tissues and promoting growth. Infection of E. coli USML2 was initiated by colonisation on the root surface, invasion of the interior root system followed by endophytic spreading. Inoculation of E. coli USML2 in the rice rhizosphere zone resulted in a significant increase in leaf numbers (33.3%), chlorophyll content (33.3%), shoot height (34.8%) and plant dry weight (90.4%) of 42 days old rice seedlings as compared to the control. These findings also demonstrated the ability of E. coli USML2 to spread endophytically which serves as a beneficial strategy for the bacterium to colonise the host plant and gain protection against adverse soil conditions. The genome of E. coli USML2 had also revealed predicted genes essential for endophytic bacterial colonisation and plant growth promotion which further proven potentials of E. coli USML2 as Plant Growth Promoting Endophyte (PGPE).

scholarly journals Survival of Escherichia coli in a tropical estuary

2003 ◽  
Vol 21 (1) ◽  
pp. 41 ◽  
Author(s):  
Abirosh Chandran ◽  
A. A. Mohamed Hatha
Keyword(s):  
Escherichia Coli ◽  
Chemical Composition ◽  
Natural Waters ◽  
Negative Impact ◽  
Selective Medium ◽  
Physical Factors ◽  
Estuarine Water ◽  
Biotic Factors ◽  
Growth And Survival ◽  
E Coli

The survival of Escherichia coli in tropical estuarine water has been studied under controlled laboratory conditions using microcosms. The survival has been assessed in terms of various self purifying factors of the natural waters such as biological, chemical and physical factors. The biological factors considered included competition from other microorganisms, predation by protozoa and coliphages. The suitability of the chemical composition of estuarine water has been studied under chemical factors and negative impact of sunlight has been studied under physical factors. The results revealed that sunlight exerted maximum negative impact, followed by biotic factors contained in the estuarine water. However, the chemical composition of the estuarine water is found to be suitable for the growth and survival of E. coli. The injury exerted by each of the above factors was also evaluated by using a selective and non-selective medium in conjunction. It was found that sunlight resulted in 100% injury of the cells as the cells failed to develop in a selective medium. While, sunlight resulted in the extinction of 90% of the E. coli cells within the first two hours of exposure, biotic factors took nearly 24 hours to remove the same amount of population.

scholarly journals Metode Hidroponik secara DFT ( Deep Flow Technique ) dan NFT (Nutrient Film Technique) pada beberapa Media Tanam terhadap Pertumbuhan Tanaman Bayam merah (Alternanthera amoena Voss)

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Abd Chalim Asnawi ◽  
Saimul Laili ◽  
Tintrim Rahayu
Keyword(s):  
Plant Growth ◽  
Growth And Development ◽  
Research Results ◽  
Nutrient Film Technique ◽  
Growing Medium ◽  
Deep Flow Technique ◽  
Soil Media ◽  
Nutritional Needs ◽  
The Media ◽  
Hydroponic Systems

Hydroponics is agricultural cultivation without using soil media, where the media can be replaced with husk charcoal or cocopeat media. However, hydroponics is actually the use of nutrients in a solution so that the nutritional needs of the plant are as desired. Accordingly, plant growth can be maximized. The use of media other than soil does not inhibit plant growth because both charcoal husk and cocopeat can store nutrients so that plant growth is not disturbed. This study aims to determine the response of red spinach (Alternanthera amoena Voss.) to Cocopeat and husk charcoal, and also to determine the use of DFT (Deep Flow Technique) and NFT (Nutrient Film Technique) hydroponic systems on the growth and development of red spinach. The method used was RBD where Rockwool media as a control, with 6 treatments and 4 replications. From the research results, the cocopeat media and husk charcoal media gave different results where the cocopeat growing medium was greater than the husk charcoal growing medium and the DFT and NFT systems gave significantly different results where the NFT yield was greater than DFT.Keywords: Hydroponics, Red Spinach, Cocopeat, Husk Charcoal, DFT, NFTABSTRAKHidroponik adalah lahan budidaya pertanian tanpa menggunakan media tanah, dimana media dapat digantikan dengan media arang sekam ataupun cocopeat. namun hidroponik sesungguhnya yakni penggunaan nutrisi dalam larutan sehingga kebutuhan nutrisi pada tanaman sesuai keinginan. Maka pertumbuhan tanaman bisa lebih maksimal. penggunaan media selain tanah tidak menghambat pertumbuhan tanaman karena baik media arang sekam maupun cocopeat dapat menyimpan unsur hara sehingga pertumbuhan tanaman tidak terganggu. Penelitian ini bertujuan untuk mengetahui respon pada tanaman bayam merah (Alternanthera amoena Voss.) terhadap media tanam Cocopeat, dan Arang sekam, dan juga untuk mengetahui penggunaan sistem hidroponik DFT (Deep Flow Technique) dan NFT (Nutrient Film Technique) terhadap pertumbuhan dan perkembangan bayam merah. Metode yang digunakan adalah RAK dimana media rockwool sebagai kontrol, dengan 6 perlakuan dan 4 ulangan. Dari hasil penelitian Media tanam cocopeat dan media arang sekam memberikan hasil yang berbeda dimana media tanam cocopeat lebih besar dari pada media tanam arang sekam dan pada sistem DFT dan NFT memberikan hasil yang berbeda nyata dimana hasil NFT lebih besar dari pada DFT.Kata kunci : Hidroponik, Bayam Merah, Cocopeat, Arang sekam, DFT, NFT

Antibacterial Activity of Shrimp Chitosan against Escherichia coli

1999 ◽  
Vol 62 (3) ◽  
pp. 239-243 ◽  
Author(s):  
GUO-JANE TSAI ◽  
WEN-HUEY SU
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Ph Value ◽  
Divalent Cations ◽  
Bacterial Surface ◽  
E Coli ◽  
Cell Age ◽  
Bactericidal Effects ◽  
Cross Linkage ◽  
Higher Temperature

The effects of cell age, reaction temperature, pH value, and salts on the inhibitory activity of shrimp chitosan (98% deacetylated) against Escherichia coli were investigated. The age of a bacterial culture affected its susceptibility to chitosan, with cells in the late exponential phase being most sensitive to chitosan. Higher temperature (25 and 37°C) and acidic pH increased the bactericidal effects of chitosan. Sodium ions (100 mM Na+) might complex with chitosan and accordingly reduce chitosan's activity against E. coli. Divalent cations at concentrations of 10 and 25 mM reduced the antibacterial activity of chitosan, in the order of Ba2+ &gt; Ca2+ &gt; Mg2+. Chitosan also caused leakage of glucose and lactate dehydrogenase from E. coli cells. These data support the hypothesis that the mechanism of chitosan antibacterial action involves a cross-linkage between the polycations of chitosan and the anions on the bacterial surface that changes the membrane permeability.

Evaluation of Bactericidal Effects of Phenyllactic Acid on Escherichia coli O157:H7 and Salmonella Typhimurium on Beef Meat

2019 ◽  
Vol 82 (12) ◽  
pp. 2016-2022
Author(s):  
RUISHENG ZHENG ◽  
TONG ZHAO ◽  
YEN-CON HUNG ◽  
KOUSHIK ADHIKARI
Keyword(s):  
Escherichia Coli ◽  
Lactic Acid ◽  
Salmonella Typhimurium ◽  
Microbial Reduction ◽  
Escherichia Coli O157 ◽  
Phenyllactic Acid ◽  
E Coli ◽  
Log Reduction ◽  
Beef Meat ◽  
Bactericidal Effects

ABSTRACT Bactericidal effects of various concentrations of phenyllactic acid on Shiga toxin–producing Escherichia coli (STEC), including E. coli O157:H7, O26:H11, O103:H2, and O121:H19, and on Salmonella Typhimurium DT104 in pure culture and microplates assays were studied. Beef cuts were surface sprayed with phenyllactic acid or lactic acid for inactivation of E. coli O157:H7 and Salmonella Typhimurium. The 1.5% phenyllactic acid inactivated all inoculated E. coli O157:H7, O26:H11, O103:H2, and O121:H19 and Salmonella Typhimurium DT104 (&gt;6-log reduction) within 1 min of contact at 21°C, whereas 1.5% lactic acid did not result in microbial reduction. Microplate assays (for STEC and Salmonella Typhimurium DT104 at 10 to 100 CFU per well) indicated that concentrations of 0.25% phenyllactic acid or 0.25% lactic acid inhibited the growth of STEC and Salmonella Typhimurium DT104 incubated at 37°C for 24 h. Treatment of beef with 1.5% lactic acid or 1.5% phenyllactic acid reduced E. coli O157:H7 by 0.22 and 0.38 log CFU/cm2, respectively, within 5 min and reduced Salmonella Typhimurium DT104 by 0.12 and 0.86 log CFU/cm2, respectively. When meat treated with 1.5% phenyllactic acid was frozen at −20°C, inactivation of E. coli O157 and Salmonella Typhimurium DT104 was enhanced by 1.06 and 1.46 log CFU/cm2, respectively. Thus, treatment of beef with 1.5% phenyllactic acid significantly reduced the population of E. coli O157:H7 and Salmonella. HIGHLIGHTS

scholarly journals ANTIMICROBIAL ACTIVITY OF CHIVES AND GINGER EXTRACT ON ESCHERICHIA COLI AND SALMONELLA SPP. ISOLATED FROM BROILER CHICKENS

2019 ◽  
Vol 128 (3B) ◽  
Author(s):  
Phan Vu Hai ◽  
Hoang Thi Hong Van ◽  
Nguyen Van Chao ◽  
Nguyen Dinh Thuy Khuong ◽  
Thuong Thi Thanh Le ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Antimicrobial Activity ◽  
Antibacterial Activity ◽  
Minimum Inhibitory Concentration ◽  
Broiler Chickens ◽  
Inhibitory Concentration ◽  
Salmonella Spp ◽  
Ginger Extract ◽  
E Coli ◽  
Bactericidal Effects

The chives and ginger’s bulbs were extracted by ethanol 96%, 72%, 48% within 5, 10 and 15 days for each concentration (15, 30 and 45 days in total, respectively). The solidified extract then was used for antibacterial activity against E. coli and Salmonella spp. isolated from fecal of chickens with diarrhoea. The results showed that both ginger and chive, which socked and leached for greater than 30 days gave better antibacterial ability. Extracts diluted at concentrations of 5 µg/µl, 7.5 µg/µl and 10 µg/µl of ginger and chive bulbs are resistant to both bacteria. Compared with antibiotics, E. coli was resistant to amoxicillin, whereas Salmonella spp. was resistant to gentamicin and amoxicillin. The minimum inhibitory concentration (MIC) of chives extract (30 days) was 16-63 (31-125) mg/ml and ginger extract (30 days) was 16-80 (2-4) mg/ml; overall, the results indicated that both extract had bacteriostatic/bactericidal effects on E. coli and Salmonella spp.

Application of Moringa oleifera Lam. fractionated proteins for inactivation of Escherichia coli from water

2020 ◽  
Vol 81 (2) ◽  
pp. 265-273 ◽  
Author(s):  
Fabiane Masala R. Silveira ◽  
Aline Takaoka A. Baptista ◽  
Tatiane V. Dutra ◽  
Benício Alves de Abreu Filho ◽  
Raquel G. Gomes ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Moringa Oleifera ◽  
Protein Fractions ◽  
Saline Extract ◽  
E Coli ◽  
Bactericidal Effects ◽  
Natural Coagulants ◽  
Chemical Products ◽  
Seed Extracts ◽  
Moringa Oleifera Lam

Abstract Chemical products traditionally used in the disinfection of water bodies often pose human health risks. For this reason, studies on natural coagulants such as Moringa oleifera Lam. represent an alternative for the inactivation of pathogenic microorganisms, among which is Escherichia coli. This study evaluated the effect of different concentrations of coagulants obtained from Moringa seed extracts and their protein fractions in the inactivation of E. coli during the coagulation/flocculation process. The coagulants studied were the aqueous extract, saline extract and protein fractions albumin and globulin, highlighting that the protein fractions were more effective on inactivating E. coli. The protein fraction globulin at a concentration of 10.0 mg L−1 showed bactericidal effects against E. coli within 18 min, whereas the albumin showed a bacteriostatic effect within 48 min because it isolated colonies in the sediment sample.

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