scholarly journals Effets de quatre huiles essentielles sur la croissance mycélienne radiale d’un isolat de Alternaria sp. au Burkina Faso

2020 ◽  
Vol 14 (3) ◽  
Author(s):  
A. Sirima ◽  
A. Sereme ◽  
D. Sereme ◽  
K. Koïta ◽  
T.A. Nana ◽  
...  
Keyword(s):  
Essential Oils ◽  
Burkina Faso ◽  
Early Blight ◽  
Ocimum Basilicum ◽  
Huiles Essentielles ◽  
Activité Antifongique ◽  
Lippia Multiflora ◽  
Alternaria Sp ◽  
Cymbopogon Schoenanthus

L’alternariose de la tomate est une maladie cryptogamique dévastatrice dans les zones maraichères du Burkina Faso. Tous les organes de la plante (tiges, feuilles, fruits) sont attaqués, entrainant une baisse importante du rendement et une dépréciation de la qualité de la production. Dans la présente étude, quatre huiles essentielles de plantes aromatiques locales (Cymbopogon schoenanthus, Lippia multiflora, Ocimum americanum, et Ocimum basilicum) ont été testées, pour évaluer leurs propriétés d'inhibition sur la croissance radiale du mycélium d’un isolat pathogène de Alternaria sp. Le test in vitro des doses de 100%, 50%, 10%, 5% et 1% a montré que toutes ces huiles essentielles possèdent une activité antifongique sur ledit isolat. Les taux d’inhibition des huiles essentielles sur la croissance du champignon étudié vont de 25,96% à 100%. La meilleure inhibition a été enregistrée avec l’huile essentielle de Cymbopogon schoenanthus, de Ocimum basilicum et de Lippia multiflora pour les concentrations supérieures à 1%. Il ressort donc de cette étude que trois huiles essentielles, stoppent la croissance mycélienne de l’isolat pour des doses allant de 5% à 100%. Ces huiles (Cymbopogon schoenanthus, Ocimum basilicum et Lippia multiflora) pourraient être utilisées pour la mise au point de phytopesticides afin d'atténuer l’utilisation intensive et hasardeuse des pesticides.Mots clés:  Alternariose, activité antifongique, plante aromatique, tomate. English Title: Effects of four essential oils on radial mycelial growth of an isolate of Alternaria sp. in Burkina Faso Early blight of tomato is a devastating cryptogamic disease in the vegetable gardens in Burkina Faso. All plant’s organs (stems, leaves, fruits) are attacked causing a significant decrease in the yield and a depreciation of the quality of the production in the field. In the present study, four essential oils of aromatic plants (Cymbopogon schoenanthus, Lippia multiflora, Ocimum americanum, and Ocimum basilicum) were tested to evaluate the inhibition properties of these oils on the radial growth of the mycelium of an isolated pathogen of Alternaria sp. In vitro tests at doses of 100%, 50%, 10%, 5% and 1% showed that all these essential oils tested have antifungal activity on said strain. The inhibition rates of essential oils on the growth of the fungus studied range from 25.96% to 100%. The best inhibition was recorded with the essential oil of Cymbopogon schoenanthus, Ocimum basilicum and Lippia multiflora for applied concentrations more than 1%. It therefore emerges from this study that three essential oils stop the mycelial growth of the isolate for doses ranging from 5% to 100%. These oils (Cymbopogon schoenanthus, Ocimum basilicum and Lippia multiflora) could be used for the development of phytopesticides in order to reduce the intensive and hazardous use of pesticides.Keywords: Early blight, antifungal activity, aromatic plant, tomato.  

scholarly journals Efficient control of conidium germination, mycelial growth and early blight in tomato in vitro with essential oils under farm conditions

2016 ◽  
Vol 11 (43) ◽  
pp. 4401-4412
Author(s):  
L. M. Abreu C. ◽  
I. M. A. Feres C. ◽  
L. Furtado E. ◽  
C. Ming L. ◽  
O. M. Marques M. ◽  
...  
Keyword(s):  
Essential Oils ◽  
Mycelial Growth ◽  
Early Blight ◽  
Efficient Control ◽  
Conidium Germination

scholarly journals Citral-Containing Essential Oils as Potential Tyrosinase Inhibitors: A Bio-Guided Fractionation Approach

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 969
Author(s):  
Francesca Capetti ◽  
Massimo Tacchini ◽  
Arianna Marengo ◽  
Cecilia Cagliero ◽  
Carlo Bicchi ◽  
...  
Keyword(s):  
Essential Oils ◽  
Inhibitory Activity ◽  
Chemical Compositions ◽  
Litsea Cubeba ◽  
Whitening Agent ◽  
Solar Lentigo ◽  
Tyrosinase Inhibitors ◽  
Cymbopogon Schoenanthus ◽  
Bio Assay

Excessive melanin production causes serious dermatological conditions as well as minor aesthetic problems (i.e., freckles and solar lentigo). The downregulation of tyrosinase is a widespread approach for the treatment of such disorders, and plant extracts have often proven to be valuable sources of tyrosinase inhibitors. Citral (a mixture of neral and geranial) is an important fragrance ingredient that has shown anti-tyrosinase potential. It is highly concentrated in the essential oils (EOs) of Cymbopogon schoenanthus (L.) Spreng., Litsea cubeba (Lour.) Pers., Melissa officinalis L., and Verbena officinalis L. However, only L. cubeba EO has been investigated for use as a potential skin-whitening agent. This work evaluates the in vitro tyrosinase inhibitory activity of these EOs and studies, using bio-assay oriented fractionation, whether their differing chemical compositions influence the overall EO inhibitory activities via possible synergistic, additive, and/or competitive interactions between EOs components. The inhibitory activity of C. schoenanthus EO and that of M. officinalis EOs, with negligible (+)-citronellal amounts, were in-line with their citral content. On the other hand, L. cubeba and V. officinalis EOs inhibited tyrosinase to considerably greater extents as they contained β-myrcene, which contributed to the overall EO activities. Similar observations were made for M. officinalis EO, which bears high (+)-citronellal content which increased citral activity.

scholarly journals Characterization of Alternaria brassicicola isolated from tomato in Burkina Faso, and use of two essential oils for its control in vitro

2021 ◽  
Vol 17 (11) ◽  
pp. 1371-1379
Author(s):  
SIRIMA Adama ◽  
SEREME Abdoulaye ◽  
KOÏTA Kadidia ◽  
ZIDA Elisabeth ◽  
T. NANA Abel ◽  
...  
Keyword(s):  
Essential Oils ◽  
Burkina Faso ◽  
Alternaria Brassicicola

Étude phytochimique et activité antifongique in vitro des huiles essentielles de quatre espèces du genre Nepeta du Maroc

2013 ◽  
Vol 11 (3) ◽  
pp. 161-171 ◽  
Author(s):  
A. Srifi ◽  
B. Rahmouni ◽  
El H. Bouidida ◽  
K. Alaoui ◽  
Y. Cherrah ◽  
...  
Keyword(s):  
Huiles Essentielles ◽  
Activité Antifongique

scholarly journals Effect of Some Essential Oils for Limiting Early Blight (Alternaria Solani) Development in Potato Field

2009 ◽  
Vol 49 (1) ◽  
pp. 57-62 ◽  
Author(s):  
Nehal El-Mougy
Keyword(s):  
Essential Oils ◽  
Early Blight ◽  
Disease Incidence ◽  
Foliar Spray ◽  
Fungal Growth ◽  
Alternaria Solani ◽  
Plant Diseases ◽  
Effective Control ◽  
Potato Field

Effect of Some Essential Oils for Limiting Early Blight (Alternaria Solani) Development in Potato FieldThe fungicidal effect of some essential oils againstAlternaria solanione of the species that cause early blight of potato was evaluated underin vitroand field conditions. Effect of carnation, caraway, thyme oils and the chemical fungicide Ridomil MZ 72 at various concentrations on mycelial growth ofA. solaniwas tested. Carnation oil had the strongest and most extensive inhibitory effect on fungal growth. Slightly less effective were caraway and thyme oils followed by the chemical fungicide. Extended field trails for two cultivation seasons proved that the application of essential oils twice as foliar spray had a superior effect to the fungicide treatment for reducing the early blight incidence comparing with untreated control. An opposite relationship between the disease incidence and concentrations of applied essential oils was observed. The increase in potato yield also followed the same trend. The highest reduction in disease incidence and yield increase was recorded in treatments with 1% of carnation, caraway and thyme oils in descending order. Ridomil MZ 72 applied at the dose recommended by manufactories had a low effect in this regard. Essential oils treatments might be used as easily applied, safe and cost effective control methods against such plant diseases.

scholarly journals Antimicrobial activity of essential oils against early blight of tomato under in vitro conditions

2021 ◽  
Vol 10 (1) ◽  
pp. 1103-1105
Author(s):  
Vanama Sowmya ◽  
Uday Kumar Thera ◽  
K Srinivas ◽  
Kaki Pranaya
Keyword(s):  
Antimicrobial Activity ◽  
Essential Oils ◽  
Early Blight
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