scholarly journals The Plant Pathogen Rhodococcus fascians Colonizes the Exterior and Interior of the Aerial Parts of Plants

2001 ◽  
Vol 14 (5) ◽  
pp. 599-608 ◽  
Author(s):  
Karen Cornelis ◽  
Tita Ritsema ◽  
Jaap Nijsse ◽  
Marcelle Holsters ◽  
Koen Goethals ◽  
...  
Keyword(s):  
Plant Tissues ◽  
Plant Pathogenic Bacterium ◽  
Plant Surface ◽  
Symptom Development ◽  
Plant Parts ◽  
Aerial Parts ◽  
Slime Layer ◽  
Rhodococcus Fascians ◽  
Nonpathogenic Strain ◽  
Axillary Meristems

Rhodococcus fascians is a plant-pathogenic bacterium that causes malformations on aerial plant parts, whereby leafy galls occur at axillary meristems. The colonization behavior on Nicotiana tabacum and Arabidopsis thaliana plants was examined. Independent of the infection methods, R. fascians extensively colonized the plant surface where the bacteria were surrounded by a slime layer. R. fascians caused the collapse of epidermal cells and penetrated intercellularly into the plant tissues. The onset of symptom development preceded the extensive colonization of the interior. The meristematic regions induced by pathogenic strain D188 were surrounded by bacteria. The nonpathogenic strain, D188-5, colonized the exterior of the plant equally well, but the linear plasmid (pFiD188) seemed to be involved in the penetration efficiency and colonization of tobacco tissues.

scholarly journals Virulence Genes of the Phytopathogen Rhodococcus fascians Show Specific Spatial and Temporal Expression Patterns During Plant Infection

2002 ◽  
Vol 15 (4) ◽  
pp. 398-403 ◽  
Author(s):  
Karen Cornelis ◽  
Tania Maes ◽  
Mondher Jaziri ◽  
Marcelle Holsters ◽  
Koen Goethals
Keyword(s):  
Virulence Genes ◽  
Expression Profiles ◽  
Bacterial Colonization ◽  
Expression Patterns ◽  
Shoot Meristem ◽  
Plant Surface ◽  
Phytopathogenic Bacterium ◽  
Plant Parts ◽  
Plant Infection ◽  
Rhodococcus Fascians

The phytopathogenic bacterium Rhodococcus fascians provokes shoot meristem formation and malformations on aerial plant parts, mainly at the axils. The interaction is accompanied by bacterial colonization of the plant surface and tissues. Upon infection, the two bacterial loci required for full virulence, fas and att, were expressed only at the sites of symptom development, although their expression profiles differed both spatially and temporally. The att locus was expressed principally in bacteria located on the plant surface at early stages of infection. Expression of the fas locus occurred throughout infection, mainly in bacteria that were penetrating, or had penetrated, the plant tissues and coincided with sites of meristem initiation and proliferation. The implications for the regulation of virulence genes of R. fascians during plant infection are discussed.

scholarly journals Secondary Metabolites ofHypericum leptophyllumHochst., an Endemic Turkish Species

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Necdet Camas ◽  
Jolita Radusiene ◽  
Zydrunas Stanius ◽  
Omer Caliskan ◽  
Cuneyt Cirak
Keyword(s):  
Secondary Metabolites ◽  
Chlorogenic Acid ◽  
Room Temperature ◽  
Plant Tissues ◽  
Plant Materials ◽  
Plant Parts ◽  
Aerial Parts ◽  
Full Flowering ◽  
Metabolite Concentrations ◽  
First Time

In the present study, the presence of the phloroglucinol derivative hyperforin, the naphthodianthrones hypericin and pseudohypericin, the phenylpropane chlorogenic acid and the flavonoids rutin, hyperoside, kaempferol, isoquercetine, quercitrine, and quercetine was investigated inHypericum leptophyllumHochst., an endemic Turkish species for the first time. The aerial parts representing a total of 30 individuals were collected at full flowering and dissected into floral, leaf, and stem tissues. After being dried at room temperature, the plant materials were assayed for secondary metabolite concentrations by HPLC. Aerial plant parts accumulated chlorogenic acid, hyperoside, isoquercetine, quercitrine, and quercetine, but they did not accumulate hyperforin, hypericin, pseudohypericin, rutin, and kaempferol. Accumulation levels of the detected compounds varied with plant tissues. Such kind of data could be useful for elucidation of the chemotaxonomical significance of the corresponding compounds and phytochemical evaluation of this endemic species.

Gymnanthemum coloratum: Review of its Medicinal uses, Phytochemistry and Pharmacological Properties -

2020 ◽  
Vol 10 (5) ◽  
pp. 196-204
Author(s):  
Alfred Maroyi
Keyword(s):  
Traditional Medicine ◽  
Skin Diseases ◽  
Pharmacological Properties ◽  
Sources Of Information ◽  
Scientific Publications ◽  
Medicinal Uses ◽  
Sexually Transmitted ◽  
Plant Parts ◽  
Aerial Parts ◽  
Cytotoxicity Activities

Gymnanthemum coloratum is a shrub or a small tree widely used as traditional medicine throughout its distributional range in tropical Africa. The current study is aimed at reviewing the phytochemistry, pharmacological properties and medicinal uses of G. coloratum. Literature on pharmacological properties, phytochemistry and medicinal uses of G. coloratum was obtained from numerous internet sources such as Scopus, Elsevier, SciFinder, Google Scholar, Pubmed, ScienceDirect, BMC and Web of Science. Other sources of information included pre-electronic sources such as journal articles, theses, book chapters, books and other scientific publications obtained from the university library. The articles published between 1964 and 2020 were used in this study. The current study showed that G. coloratum is used as an anthelmintic, and traditional medicine for reproductive problems, schistosomiasis, liver diseases, sexually transmitted infections, diabetes, sores and wounds, respiratory problems, malaria, skin diseases, fever and gastro-intestinal problems. Ethnopharmacological research identified glaucolides, lactones, amino acids, essential oils, alkaloids, anthocyanins, cardenolids, coumarins, flavonoids, glycosides, leucoanthocyanins, phenols, quinones, reducing sugars, saponins, steroids, tannins, terpenoids and triterpenes from the aerial parts, leaves, roots and stems of G. coloratum. The aerial parts, leaves, roots and whole plant parts of G. coloratum and compounds isolated from the species exhibited anthelmintic, antimicrobial, anti-Blastocystis, anti-inflammatory, anti-sickling, insecticidal and larvicidal, antiplasmodial, antimalarial, antioxidant, antiproliferative, anti-Toxoplasma, hypoglycaemic and antidiabetic and cytotoxicity activities. Gymnanthemum coloratum should be subjected to detailed phytochemical, pharmacological and toxicological evaluations aimed at correlating its medicinal uses with its phytochemistry and pharmacological activities.

Hilliardiellia aristata: Review of its Medicinal uses, Phytochemistry and Pharmacological properties

2021 ◽  
pp. 5563-5568
Author(s):  
Alfred Maroyi
Keyword(s):  
Traditional Medicine ◽  
Respiratory Infections ◽  
Herbaceous Plant ◽  
Pharmacological Properties ◽  
Sources Of Information ◽  
Scientific Publications ◽  
Medicinal Uses ◽  
Plant Parts ◽  
Aerial Parts ◽  
Toxicological Studies

Hilliardiellia aristata is a herbaceous plant species used as traditional medicine in southern Africa. The current investigation is aimed at reviewing the phytochemistry, pharmacological properties and medicinal uses of H. aristata. Results of the current study are based on literature search on pharmacological properties, phytochemistry and medicinal uses of H. aristata using information obtained from several internet sources such as Scopus, Elsevier, SciFinder, Google Scholar, Pubmed, ScienceDirect, BMC and Web of Science. Other sources of information included pre-electronic sources such as journal articles, theses, book chapters, books and other scientific publications obtained from the University library. The current study showed that H. aristata is used as a protective charm, traditional medicine for kidney problems, fever, headache, respiratory infections and malaria. Ethnopharmacological research identified glaucolides, lactones, alkaloids, phenols, tannins, glycosides, terpenoids, saponins, flavonoids and steroids from the aerial parts and leaves of H. aristata. The aerial parts, leaves, roots and whole plant parts of H. aristata exhibited anti-inflammatory, antibacterial, antifungal, antiplasmodial, antiprotozoal, larvicidal and cytotoxicity activities. Hilliardiella aristata should be subjected to detailed phytochemical, pharmacological and toxicological studies.

scholarly journals Chemical Composition of the Essential Oils from the Flower, Leaf and Stem of Lonicera japonica

2012 ◽  
Vol 7 (5) ◽  
pp. 1934578X1200700
Author(s):  
Nenad Vukovic ◽  
Miroslava Kacaniova ◽  
Lukas Hleba ◽  
Slobodan Sukdolak
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Lonicera Japonica ◽  
Hexadecanoic Acid ◽  
Plant Parts ◽  
Aerial Parts ◽  
Monoterpene Hydrocarbons

The essential oils from different aerial parts of Lonicera japonica have been extracted by hydro-distillation and analyzed by gas chromatography and gas chromatography coupled with mass spectrometry. Quantitative and qualitative differences were found between the analyzed plant parts. A total of eighty-nine compounds were identified. The main constituents were ( Z, Z)-farnesole (16.2%) and linalool (11.0%) for the flowers fraction, hexadecanoic acid (16.0%) and linalool (8.7%) for the leaves fraction, and hexadecanoic acid (31.4%) for the stems. Monoterpene hydrocarbons were absent from all the oils, and oxygenated sesquiterpenes were not identified in the essential oil of the stem.

scholarly journals Ethylene Production by Slices of Green Banana Fruit and Potato Tuber Tissue During The Development of Induced Respiration

1969 ◽  
Vol 22 (2) ◽  
pp. 489 ◽  
Author(s):  
WB Mcglasson
Keyword(s):  
Ethylene Production ◽  
Plant Tissues ◽  
Underground Storage ◽  
Banana Fruit ◽  
Physiological Changes ◽  
Tissue Slices ◽  
Tuber Tissue ◽  
Plant Parts ◽  
Storage Organs ◽  
Green Banana

It is well known that injury and infection by disease organisms may stimulate ethylene production by plant tissues (Williamson 1950; Burg 1962; McGlasson and Pratt 1964). The increased ethylene production which results from injury in fruit tissues may hasten the onset of a respiratory climacteric. This response, which has been observed in slices cut from three-quarter-grown cantaloupe fruit, may herald the commencement of physiological changes leading to natural ripening (McGlasson and Pratt 1964). However, in underground storage tissues, stimulated ethylene production may be concerned with the mechanisms of wound healing (Stahmann, Clare, and Woodbury 1966; Imaseki, Uchiyama, and Uritani 1968). The phenomenon of induced respiration in tissue slices of bulky underground storage organs has been known for many years (Laties 1967) and more recently it has been found to occur in sections or slices of other plant parts (ap Rees 1966). Palmer and McGlasson (1969) observed a similar rise in slices of green banana fruit which they considered to be a form of "induced" respiration.

scholarly journals Cross Talk Between Zinc-Solubilizing Bacteria and Plants: A Short Tale of Bacterial-Assisted Zinc Biofortification

2022 ◽  
Vol 1 ◽  
Author(s):  
Viabhav Kumar Upadhayay ◽  
Ajay Veer Singh ◽  
Amir Khan
Keyword(s):  
Plant Growth ◽  
Crop Improvement ◽  
Plant Tissues ◽  
Soil Environment ◽  
Improvement Program ◽  
Plant Parts ◽  
Metal Chelating ◽  
Zn Uptake ◽  
Bacterial Cell Membrane ◽  
Green Solution

A contemporary approach to bacterially mediated zinc (Zn) biofortification offers a new dimension in the crop improvement program with better Zn uptake in plants to curb Zn malnutrition. The implication of Zn solubilizing bacteria (ZSB) represents an inexpensive and optional strategy for Zn biofortification, with an ultimate green solution to enlivening sustainable agriculture. ZSB dwelling in the rhizospheric hub or internal plant tissues shows their competence to solubilize Zn via a variety of strategies. The admirable method is the deposition of organic acids (OAs), which acidify the surrounding soil environment. The secretion of siderophores as a metal chelating molecule, chelating ligands, and the manifestation of an oxidative–reductive system on the bacterial cell membrane are further tactics of bacterially mediated Zn solubilization. The inoculation of plants with ZSB is probably a more effective tactic for enhanced Zn translocation in various comestible plant parts. ZSB with plant growth-enhancing properties can be used as bioelicitors for sustainable plant growth via the different approaches that are crucial for plant health and its productivity. This article provides an overview of the functional properties of ZSB-mediated Zn localization in the edible portions of food crops and provides an impetus to explore such plant probiotics as natural biofortification agents.

scholarly journals Heavy metal contents in Veronica species and soil from mountain areas in Serbia

2012 ◽  
Vol 77 (7) ◽  
pp. 959-970 ◽  
Author(s):  
Jelena Zivkovic ◽  
Slavica Razic ◽  
Jelena Arsenijevic ◽  
Zoran Maksimovic
Keyword(s):  
Heavy Metal ◽  
Absorption Spectrometry ◽  
Mountain Areas ◽  
Plant Parts ◽  
Aerial Parts ◽  
Plant Samples ◽  
Fe Content ◽  
Uptake Pattern ◽  
Flameless Atomic Absorption Spectrometry ◽  
Species Specific

This paper describes the relationships between concentrations of selected trace elements in soil and their bioaccumulation in aerial parts of three Veronica species (Plantaginaceae). Plant and soil samples were collected from three mountainous areas in Serbia, prepared by microwave acid-assisted digestion and analyzed by flame and flameless atomic absorption spectrometry. Total concentrations of Cu, Zn, Mn, Fe and Cr in the soil varied from 12.38 to 47.77, 62.78 to 138.00, 517.58 to 1675.78, 13574.22 to 35920.00 and 36.18 to 115.15 mg/kg, while those in the plants ranged from 6.04 to 12.8, 27.66 to 58.01, 25.38 to 89.25, 35.53 to 563.26 and 0.44 to 18.96 mg/kg, respectively. There were no significant differences in heavy metal concentrations between tested Veronica species from the same location, indicating that their heavy metal uptake pattern was not species specific. In the case of Mn, despite its wide variation in soil, concentrations in plant samples were uniform, which suggests potential ability of tested species to control Mn uptake or translocation to upper plant parts. Additionally, the lowest concentrations of Cu were obtained in plant samples collected from soil with the highest Fe concentrations, pointing out that Cu availability to plants might be reduced due to high Fe content in soil solution.

scholarly journals pFiD188, the Linear Virulence Plasmid of Rhodococcus fascians D188

2012 ◽  
Vol 25 (5) ◽  
pp. 637-647 ◽  
Author(s):  
Isolde Francis ◽  
Annick De Keyser ◽  
Philippe De Backer ◽  
Carmen Simón-Mateo ◽  
Jutta Kalkus ◽  
...  
Keyword(s):  
Virulence Genes ◽  
Mutational Analysis ◽  
Linear Plasmid ◽  
Virulence Plasmid ◽  
Symptom Development ◽  
Linear Plasmids ◽  
Type Iv ◽  
Rhodococcus Fascians ◽  
Syntenic Regions ◽  
Insight Into

Rhodococcus fascians is currently the only phytopathogen of which the virulence genes occur on a linear plasmid. To get insight into the origin of this replicon and into the virulence strategy of this broad-spectrum phytopathogen, the sequence of the linear plasmid of strain D188, pFiD188, was determined. Analysis of the 198,917 bp revealed four syntenic regions with linear plasmids of R. erythropolis, R. jostii, and R. opacus, suggesting a common origin of these replicons. Mutational analysis of pFi_086 and pFi_102, similar to cutinases and type IV peptidases, respectively, showed that conserved region R2 was involved in plasmid dispersal and pointed toward a novel function for actinobacterial cutinases in conjugation. Additionally, pFiD188 had three regions that were unique for R. fascians. Functional analysis of the stk and nrp loci of regions U2 and U3, respectively, indicated that their role in symptom development was limited compared with that of the previously identified fas, att, and hyp virulence loci situated in region U1. Thus, pFiD188 is a typical rhodococcal linear plasmid with a composite structure that encodes core functions involved in plasmid maintenance and accessory functions, some possibly acquired through horizontal gene transfer, implicated in virulence and the interaction with the host.

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