scholarly journals Endophytic Bacterium Pseudomonas fluorescens RG11 May Transform Tryptophan to Melatonin and Promote Endogenous Melatonin Levels in the Roots of Four Grape Cultivars

2017 ◽  
Vol 07 ◽  
Author(s):  
Yaner Ma ◽  
Jian Jiao ◽  
Xiucai Fan ◽  
Haisheng Sun ◽  
Ying Zhang ◽  
...  
Keyword(s):  
Pseudomonas Fluorescens ◽  
Endophytic Bacterium ◽  
Grape Cultivars ◽  
Endogenous Melatonin

scholarly journals Phenylalanine 4-Hydroxylase Contributes to Endophytic Bacterium Pseudomonas fluorescens’ Melatonin Biosynthesis

2021 ◽  
Vol 12 ◽  
Author(s):  
Jian Jiao ◽  
Yan Xia ◽  
Yingli Zhang ◽  
Xueli Wu ◽  
Chonghuai Liu ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Pseudomonas Fluorescens ◽  
Current Knowledge ◽  
Endophytic Bacterium ◽  
Significant Decline ◽  
Hydroxylase Activity ◽  
Abiotic Stressors ◽  
Melatonin Production ◽  
Endogenous Melatonin

Melatonin acts both as an antioxidant and as a growth regulatory substance in plants. Pseudomonas fluorescens endophytic bacterium has been shown to produce melatonin and increase plant resistance to abiotic stressors through increasing endogenous melatonin. However, in bacteria, genes are still not known to be melatonin-related. Here, we reported that the bacterial phenylalanine 4-hydroxylase (PAH) may be involved in the 5-hydroxytryptophan (5-HTP) biosynthesis and further influenced the subsequent production of melatonin in P. fluorescens. The purified PAH protein of P. fluorescens not only hydroxylated phenylalanine but also exhibited l-tryptophan (l-Trp) hydroxylase activity by converting l-Trp to 5-HTP in vitro. However, bacterial PAH displayed lower activity and affinity for l-Trp than l-phenylalanine. Notably, the PAH deletion of P. fluorescens blocked melatonin production by causing a significant decline in 5-HTP levels and thus decreased the resistance to abiotic stress. Overall, this study revealed a possible role for bacterial PAH in controlling 5-HTP and melatonin biosynthesis in bacteria, and expanded the current knowledge of melatonin production in microorganisms.

scholarly journals Genetic Responses Induced in Olive Roots upon Colonization by the Biocontrol Endophytic Bacterium Pseudomonas fluorescens PICF7

PLoS ONE ◽  
2012 ◽  
Vol 7 (11) ◽  
pp. e48646 ◽  
Author(s):  
Elisabetta Schilirò ◽  
Massimo Ferrara ◽  
Franco Nigro ◽  
Jesús Mercado-Blanco
Keyword(s):  
Pseudomonas Fluorescens ◽  
Endophytic Bacterium ◽  
Genetic Responses

Bacterial endophytes in cotton: location and interaction with other plant-associated bacteria

1997 ◽  
Vol 43 (3) ◽  
pp. 254-259 ◽  
Author(s):  
A. Quadt-Hallmann ◽  
J. Hallmann ◽  
J. W. Kloepper
Keyword(s):  
Biological Control ◽  
Pseudomonas Fluorescens ◽  
Plant Pathogens ◽  
Biological Control Agent ◽  
Leaf Tissue ◽  
Endophytic Bacterium ◽  
Epidermal Cells ◽  
Control Activity ◽  
Associated Bacteria ◽  
Internal Colonization

Investigations were conducted to determine if biological control agent Pseudomonas fluorescens 89B-61 could colonize cotton tissues systemically and if internal colonization by a known endophytic bacterium, Enterobacter asburiae JM22, was influenced by the presence of other plant-associated bacteria. Following seed treatment, Pseudomonas fluorescens 89B-61 colonized cotton roots both externally and internally at mean population densities of 8.7 × 105 CFU/g and 1.1 × 103 CFU/g, respectively. However, bacteria were not detected in cotyledons, leaves, or stems. After inoculation onto leaves, Pseudomonas fluorescens 89B-61 established a mean internal population density of 1.6 × 104 CFU/g leaf tissue. Following stem injection, Pseudomonas fluorescens 89B-61 did not colonize roots or leaves. Pseudomonas fluorescens 89B-61 was localized on the root surface concentrated in grooves between epidermal cells, below collapsed epidermal cells, and in intercellular spaces close to the root epidermis, as identified by immunogold labeling of the bacterial membrane. Combined application of E. asburiae JM22 with another endophyte, Paenibacillus macerans Tri2-10, resulted in significantly lower internal populations of E. asburiae JM22 compared with treatment with E. asburiae JM22 alone. However, when coinoculated with a rhizosphere colonist, Micrococcus agilis strain 2RD-11, the colonization density of E. asburiae JM22 was not negatively affected. The results suggest that the internal colonization of cotton by bacteria with biological control activity may be an important aspect in their capacity to protect host plants against plant pathogens. The extent of internal colonization was shown to be influenced by other bacterial colonists.Key words: endophytic bacteria, location, interaction, cotton.

scholarly journals The biocontrol endophytic bacterium Pseudomonas fluorescens PICF7 induces systemic defense responses in aerial tissues upon colonization of olive roots

2014 ◽  
Vol 5 ◽  
Author(s):  
Carmen Gómez-Lama Cabanás ◽  
Elisabetta Schilirò ◽  
Antonio Valverde-Corredor ◽  
Jesús Mercado-Blanco
Keyword(s):  
Pseudomonas Fluorescens ◽  
Endophytic Bacterium ◽  
Defense Responses

Melatonin: Protection of the Intervertebral Disc

2019 ◽  
Vol 2 (3) ◽  
pp. 1-9
Author(s):  
Russel J Reiter ◽  
Sergio Rosales-Corral ◽  
Ramaswamy Sharma
Keyword(s):  
Intervertebral Disc ◽  
Molecular Mechanisms ◽  
Intervertebral Discs ◽  
Lumbar Pain ◽  
Low Back ◽  
Work Time ◽  
Protective Actions ◽  
Aging Populations ◽  
Definition Of ◽  
Endogenous Melatonin

     Low back pain (lumbar pain) due to injury of or damage to intervertebral discs is common in all societies.  The loss of work time as a result of this problem is massive.  Recent research suggests that melatonin may prevent or counteract intervertebral disc damage. This may be especially relevant in aging populations given that endogenous melatonin, in most individuals, dwindles with increasing age. The publications related to melatonin and its protection of the intervertebral disc are reviewed herein, including definition of some molecular mechanisms that account for melatonin’s protective actions. 

Exemplar Abstract for Pseudomonas fluorescens Migula 1895 (Approved Lists 1980).

2003 ◽  
Author(s):  
Charles Thomas Parker ◽  
Dorothea Taylor ◽  
George M Garrity
Keyword(s):  
Pseudomonas Fluorescens
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