scholarly journals Antifungal potential of cinnamon essential oils against Phytophthora colocasiae causing taro leaf blight

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Zhang Hong ◽  
Kalhoro Muhammad Talib ◽  
Kalhoro Ghulam Mujtaba ◽  
Hou Dabin ◽  
Faqir Yahya ◽  
...  
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Plant Pathogens ◽  
Chemical Constituents ◽  
Leaf Blight ◽  
Residual Effects ◽  
Phytophthora Colocasiae ◽  
Antifungal Potential ◽  
Leaf Necrosis ◽  
Taro Leaf Blight

Abstract Background Taro leaf blight, caused by a severely destructive oomycete fungus Phytophthora colocasiae, is responsible for threatening yield loss worldwide. The pathogen has the ability to germinate and spread rapidly to other plants during favorable conditions resulting in acute decline and even death, causing 100% crop loss. Farmers usually rely on highly toxic systemic fungicides to control the disease, which is effective, but residual effects and resistance of these agrochemicals is still a concern. Recently as returning to nature people tend to use chemical-free products, especially edible stuff produced in organic agriculture. Therefore, the use of bio-pesticides and phytochemicals is gaining special attention by scientists as they are ecofriendly non-hazardous, sustainable, and potent alternatives to control many virulent plant pathogens The present research was conducted to assess the antifungal potential of cinnamon essential oils against P. colocasiae. Materials and methods The essential oils from cinnamon bark were extracted using microwave-assisted hydrodistillation equipment, and then their chemical constituents were evaluated using ATR FTIR spectroscopy. The antifungal potential of essential oil was assessed against mycelium, sporangia, zoospore, leaf necrosis, and corms lesions under laboratory conditions at, 0.156, 0.312, 0.625, 1.25, 2.5, 5.0 mg/mL concentrations. Hymexazol was used as positive control and no essential oil as negative control, while each treatment have three replications and experiment repeated twice. Results The main component of oil was identified as cinnamaldehyde. The pathogen isolated from infected taro leaves was identified as P.colocasiae and then was used as a test fungus in the current study. Repeated experiments show maximum inhibition percentage of mycelial growth, zoospore germination, and sporulation of the fungus were observed at 0.625 mg/mL, whereas leaf necrosis was 100% inhibited at 1.25 mg/mL concentration. Conclusion This research can be a reference for easy, cost-effective and environment-friendly management and control of taro leaf blight with phytochemicals and plant essential oil derivatives. Graphic abstract

Potential use of Eucalyptus globulus essential oil against Phytophthora colocasiae the causal agent of taro leaf blight

2014 ◽  
Vol 140 (2) ◽  
pp. 243-250 ◽  
Author(s):  
Modeste Lambert Sameza ◽  
Marie Ampere Bedine Boat ◽  
Séverin Tchameni Nguemezi ◽  
Lile Christere Nguemnang Mabou ◽  
Pierre Michel Jazet Dongmo ◽  
...  
Keyword(s):  
Essential Oil ◽  
Eucalyptus Globulus ◽  
Leaf Blight ◽  
Causal Agent ◽  
Phytophthora Colocasiae ◽  
Taro Leaf Blight ◽  
Potential Use

Using Citrus aurantifolia essential oil for the potential biocontrol of Colocasia esculenta (taro) leaf blight caused by Phytophthora colocasiae

2017 ◽  
Vol 25 (30) ◽  
pp. 29929-29935 ◽  
Author(s):  
Séverin Nguemezi Tchameni ◽  
Staelle Njamou Mbiakeu ◽  
Modeste Lambert Sameza ◽  
Pierre Michel Dongmo Jazet ◽  
François Tchoumbougnang
Keyword(s):  
Essential Oil ◽  
Colocasia Esculenta ◽  
Leaf Blight ◽  
Citrus Aurantifolia ◽  
Phytophthora Colocasiae ◽  
Taro Leaf Blight

scholarly journals Screening the antifungal properties of essential oils against Phytophthora colocasiae

2021 ◽  
Author(s):  
Muhammad Talib Kalhoro ◽  
Hong Zhang ◽  
Ghulam Mujtaba Kalhoro ◽  
Yahya Faqir ◽  
Fukai Wang ◽  
...  
Keyword(s):  
Essential Oils ◽  
Plant Pathogens ◽  
Pathogen Resistance ◽  
Plant Diseases ◽  
Chemical Components ◽  
Tea Tree ◽  
Antifungal Properties ◽  
Phytophthora Colocasiae ◽  
Worldwide Production ◽  
Leaf Necrosis

Abstract Recently Microbicidal and micro-static activities of naturally obtained botanicals have been extensively explored, generally in response to the devastating apprehension of consumers towards the safety of edible products. However, scientists are paying more interest in using bio pesticides and phytochemicals that constitute environmentally favorable, non-toxic, long-lasting, and productive substitutes for preventing many hazardous plant pathogens. This research aimed to investigate the antifungal capabilities of sage and tea tree essential oils towards taro leaf blight, the most important cause of worldwide production losses. Using synthetic fungicides is a rapid and effective approach for controlling plant diseases, but it also creates human health risks, environmental threats, and chances of pathogen resistance. The essential oils of sage and tea tree were obtained by microwave-assisted hydro-distillation, and their chemical components were analyzed using FTIR spectroscopy. The main components of the oil were Thujone and Terpinen-4-ol, in sage and tea, respectively. A casual disease agent isolated from symptomatic taro leaves is used as a test fungus and identified as Phytophthora colocasiae. The antifungal properties of both essential oils were evaluated against mycelium, sporangium, zoospores, leaf necrosis, and corm lesions. Repeated experiments showed that the minimum concentrations for obtaining 100% inhibition of mycelium, zoospore germination, sporangia formation, and leaf necrosis were estimated at 2.5 and 5.0 mg/mL of sage and tea tree oils, respectively. Outcomes of this study provide an allusion for the prevention and curation of plant diseases promptly, economically, and environmentally by using phytochemicals and plant essential oil derivatives.

scholarly journals Constituents of Peel and Leaf Essential Oils of Citrus Medica L

2009 ◽  
Vol 1 (2) ◽  
pp. 387-392 ◽  
Author(s):  
M. N. I. Bhuiyan ◽  
J. Begum ◽  
P. K. Sardar ◽  
M. S. Rahman
Keyword(s):  
Gas Chromatography ◽  
Essential Oil ◽  
Essential Oils ◽  
Mass Spectroscopy ◽  
Chemical Constituents ◽  
Citrus Medica ◽  
Leaf Oil ◽  
Gas Chromatography Mass Spectroscopy ◽  
Total Oil ◽  
Peel Oil

The chemical constituents of leaf and peel essential oil of Citrus medica L. were analysed by gas chromatography mass spectroscopy (GC-MS). Nineteen components accounting for 99.9% of the oil were identified in leaf oil. The major constituents are erucylamide (28.43%), limonene (18.36%) and citral (12.95%). The peel oil contains forty three components accounting for 99.8% of the total oil and the major components are isolimonene (39.37%), citral (23.12%) and limonene (21.78%). Keywords: Citrus medica; Essential oils; GC-MS; Erucylamide; Isolimonene. © 2009 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.DOI: 10.3329/jsr.v1i2.1760   

scholarly journals Extraction, Radical Scavenging and Antimicrobial Activity of Essential Oils of Root of Dryopteris marginalis

2019 ◽  
Vol 31 (11) ◽  
pp. 2512-2516 ◽  
Author(s):  
Md. Zahidul Islam ◽  
Jannat Al Foisal ◽  
Mahbubur Rahman ◽  
Mst. Afsana Mimi ◽  
Faridul Islam ◽  
...  
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Antioxidant Activities ◽  
Chemical Constituents ◽  
Total Concentration ◽  
Petroleum Ether Extract ◽  
Radical Scavenging ◽  
Organic Extracts ◽  
Zones Of Inhibition ◽  
Essential Oil Yield

The aim of the study was to characterize the chemical constituents and determine antibacterial and antioxidant activities of essential oils and three different extracts of Dryopteris marginalis. The root had essential oil yield of 0.36 % (w/w) in which 12 organic compounds representing 97.22% of the root oils were identified. Tyranton was found as the most abundant component with 77.571 % of the total concentration in the essential oil. The zones of inhibition of different organic extracts against the tested bacteria were found in the range of 6.5-15 mm. Pseudomonas was the most vulnerable with MICs of 15.62 μg/mL by both ethyl acetate and petroleum ether extract producing 3.8 mm zone of inhibition. The essential oils extracted from roots of Dryopteris marginalis showed maximum 85.29 % inhibition of radical scavenging at 2 mg/mL concentration. Among all root extracts, methanol extract exhibited 41.11 % inhibition at 2 mg/mL concentration.

scholarly journals Chemical Characterization and Antidiabetic Activity of Essential Oils from Pelargonium graveolens Leaves

2021 ◽  
Vol 9 (1) ◽  
pp. 109-113
Author(s):  
Javed Ahamad ◽  
Subasini Uthirapathy
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Chemical Constituents ◽  
Chemical Characterization ◽  
Study Finding ◽  
Antidiabetic Activity ◽  
Chemical Components ◽  
Diabetic Patients ◽  
Pelargonium Graveolens

Pelargonium graveolens (Geranium) is a source of the finest quality of fragrance and its essential oils are used as antibacterial, and antifungal agents. The aim of the current research is to determine chemical constituents in the essential oil of P. graveolens by GC-MS and evaluate its antidiabetic activity via α-glucosidase inhibition assay. The chemical composition of P. graveolens essential oil was determined by GC/MS and its antidiabetic activity was assessed through inhibition of α-glucosidase enzyme in in-vitro models. GC-MS analysis determines 36 chemical components in the essential oil of P. graveolens leaves, and citronellyl isovalerate (10.41 %), menthol (9.61 %), linalool (8.63 %), p-menthone (6.31 %), and geranyl tiglate (4.99 %) were recorded as major constituents. The essential oil of P. graveolens leaves showed concentration dependant inhibition of α-glucosidase enzyme ranging from 28.13±1.41 to 74.24±2.53 µg/mL for concentration ranging from 31.25 to 1000 µg/mL. The IC50 values for of P. graveolens and acarbose were found as 93.72±4.76 and 80.4±2.17 µg/mL, respectively against the α-glucosidase enzyme. The study finding explores the chemical components of P. graveolens growing in the Iraqi Kurdistan region and scientifically supported its possible use in diabetic patients for controlling postprandial hyperglycemia.

scholarly journals Evaluation of volatile constituents, exudation of resin and occurrence of galls of Protium aracouchini (Aubl.) Marchand

2021 ◽  
Vol 5 (3) ◽  
pp. 88
Author(s):  
Thiago Augusto Araujo Correia Lima (in memorian) ◽  
Leonardo Pinto Cunha ◽  
José Eduardo Lahoz da Silva Ribeiro ◽  
Marcia Ortiz Mayo Marques ◽  
Maria da Paz Lima
Keyword(s):  
Essential Oil ◽  
Essential Oils ◽  
Chemical Constituents ◽  
Brazilian Amazon ◽  
High Concentration ◽  
Forest Reserve ◽  
Volatile Constituents ◽  
Aerial Parts ◽  
First Time ◽  
Time Information

Protium aracouchini (Aubl.) Marchand [sin Icica aracouchini Aubl.], which occurs in the Adolpho Ducke Forest Reserve, in the Brazilian Amazon, was evaluated for the presence of galls, for resin exudation and the composition of the essential oils from the aerial parts and the resin. The experiment to stimulate the exudation of resin from the trunk was conducted using a 2-chloroethylphosphonic acid solution. The resin produced after 40 days and the aerial parts had their essential oils extracted in a Clevenger apparatus and the volatile chemical constituents were analyzed using GC/MS. The non-oxygenated sesquiterpenes α-copaene (21.15%) and α-gurjunene (13.69%), in addition to the oxygenated sesquiterpene spathulenol (10.32%), were detected as the majority constituents of the essential oil of the leaves, and a concentration similar to that of α-gurjunene was found in the branches (13.28%). The resin essential oil showed a high concentration of hydrocarbon monoterpenes (76.49%) with a predominance of α-pinene (17.57%) and limonene (46.11%). Four gall morphotypes were found associated with this species. The present study reports for the first time information on the volatile constituents and the resinous potential of P. aracouchini, and registers the morphotypes of the galls that help in the taxonomy of the species.

scholarly journals COMPARATIVE STUDY OF DIFFERENT ROSEMARY ESSENTIAL OIL

1970 ◽  
Vol 63 ◽  
Author(s):  
Sonia A. Socaci ◽  
Maria Tofana ◽  
Carmen Socaciu ◽  
D. Varban ◽  
Sevastita Muste
Keyword(s):  
Essential Oil ◽  
Comparative Study ◽  
Essential Oils ◽  
Plant Material ◽  
Chemical Constituents ◽  
Rosemary Essential Oil

The present study includes researches regarding the composition of different varieties of rosemary essential oil. The essential oils were extracted from the plant material using the hydrodistillation technique. The analyses of the composition of essential oils were carried out by using a GC-MS system. The chemical constituents of the essential oil were separated and identified using the GC-MS NIST libraries.

scholarly journals Chemical composition of essential oil extracted from leaves of Campomanesia adamantium subjected to different hydrodistillation times

2017 ◽  
Vol 47 (1) ◽  
Author(s):  
Juliana Dantas de Oliveira ◽  
Daniely Karen Matias Alves ◽  
Mayker Lazaro Dantas Miranda ◽  
José Milton Alves ◽  
Marcelo Nogueira Xavier ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Oil Content ◽  
Chemical Constituents ◽  
Caryophyllene Oxide ◽  
Fruit Species ◽  
Randomized Design ◽  
Completely Randomized Design

ABSTRACT: Campomanesia adamantium is a native fruit species of the Cerrado and is used in food and medicines and as bee pasture. The chemical composition of essential oils obtained from plants of the same species have varying constituent proportions due to the influence of extractive factors, environmental, genetic and ontogenetic. This study aimed to identify the influence of hydrodistillation time on the content and chemical composition of essential oil extracted from the leaves of C. adamantium . Treatments consisted of five extraction times (1, 2, 3, 4, and 5h) using Clevenger with five replications in a completely randomized design. It was observed that after two hours of hydrodistillation, the essential oil content remains constant. Regarding the chemical constituents of essential oil, variation of the proportions of the compounds tested occurred at all hydrodistillation times. The compounds spathulenol oxygenated sesquiterpenes and caryophyllene oxide were the majority in the five hydrodistillation times.

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