scholarly journals Defense of Host Plants against Orgyia trigotephras in Northeast of Tunisia

2020 ◽  
Vol 15 (2) ◽  
pp. 81-89
Author(s):  
Olfa Ezzine ◽  
◽  
Hnia Chograni ◽  
Samir Dhahri ◽  
Mohamed Lahbib Ben Jamâa ◽  
...  
Keyword(s):  
Essential Oils ◽  
Host Plants ◽  
Pistacia Lentiscus ◽  
Quercus Coccifera ◽  
Insect Larvae ◽  
Primary Metabolites ◽  
Potassium Sodium ◽  
Nitrogen Levels ◽  
North East ◽  
Low Concentrations

The egg-larval stage of Orgyia trigotephras were observed in shrubs maquis of Jebel Abderrahmane in north-east Tunisia, mainly on Quercus coccifera and Pistacia lentiscus, while only eggs were noticed on Phillyrea media. This kind of observation suggest us to study tree defense against O. trigotephras which will be explored by chemical analysis of P. lentiscus, Q. coccifera and P. media. Two types of analyses were the focus of this study to understand plant defense (i) primary metabolites and (ii) components of essential oils of these tested plants. Kjeldhal method was used for nitrogen and Mrssorr method for potassium, sodium and phosphorus extraction. Essential oils were extracted with the hexane solvent; chemical composition was determined using (GC/MS) methods. Oil compounds were identified by comparison to their retention time. Results of mineral extraction showed that percentage of potassium, sodium, phosphorus and nitrogen were more important in P. lentiscus and P. media than in Q. coccifera. Five major compounds were identified from essential oils of Q. coccifera, four from P. media and four from P. lentiscus. Nitrogen, which is a source of protein for insects, is produced in low concentrations in the foliage, decreasing nitrogen levels strategy for defending the plant against insect larvae. The absence of monoterpens in the foliage at P. media could explain the choice of larvae not to feed upon this host which probably confers resistance against this defoliator.

Biomass of understory species of Pinus halepensis Mill. forests in the Kassandra Peninsula - Chalkidiki

1998 ◽  
Vol 63 ◽  
Author(s):  
P. Smiris ◽  
F. Maris ◽  
K. Vitoris ◽  
N. Stamou ◽  
P. Ganatsas
Keyword(s):  
Moisture Content ◽  
Aboveground Biomass ◽  
Quercus Ilex ◽  
Pinus Halepensis ◽  
Biomass Estimation ◽  
Regression Equations ◽  
Pistacia Lentiscus ◽  
Quercus Coccifera ◽  
Understory Species ◽  
Cistus Incanus

This  study deals with the biomass estimation of the understory species of Pinus halepensis    forests in the Kassandra peninsula, Chalkidiki (North Greece). These  species are: Quercus    coccifera, Quercus ilex, Phillyrea media, Pistacia lentiscus, Arbutus  unedo, Erica arborea, Erica    manipuliflora, Smilax aspera, Cistus incanus, Cistus monspeliensis,  Fraxinus ornus. A sample of    30 shrubs per species was taken and the dry and fresh weights and the  moisture content of    every component of each species were measured, all of which were processed  for aboveground    biomass data. Then several regression equations were examined to determine  the key words.

Ovipositional Host Plant Preference of Sepia officinalis

1990 ◽  
Vol 45 (11-12) ◽  
pp. 1225-1229
Author(s):  
J. Manuel Denucé
Keyword(s):  
Host Plants ◽  
Quercus Ilex ◽  
Daily Basis ◽  
Sepia Officinalis ◽  
Pistacia Lentiscus ◽  
Laurus Nobilis ◽  
Aerial Parts ◽  
Ovipositional Preference ◽  
Chemical Attraction ◽  
Observation Period

Abstract The present study was undertaken to verify ancient data in the literature on ovipositional preference of the cuttlefish Sepia officinalis for the terrestrial plant Pistacia lentiscus (mastic tree). -Adult specimens of Sepia were placed in basins together with aerial parts not only of P. lentiscus, but also of Artemisia arborescens, Centaurea alba var. deusta, Quercus ilex and Laurus nobilis. The egg masses deposited on the plants were quantified on a daily basis during the 16 day observation period. By far the largest amounts of eggs were found attached to the stems and petioles of P. lentiscus (51.8%), but Q. ilex and A. arborescens also scored high as ovipositional host plants (23.1 and 20.2% respectively). L. nobilis and C. alba var. deusta ranked very low (3.6 and 1.3% respectively). Considering the extremely divergent shape of the three preferred oviposition substrates, which excludes affinity for a uniform type of plant, the possibility of chemical attraction cannot be ruled out.

Screening of fruit and leaf essential oils ofLitsea cubebaPers. from north-east India – chemical composition and antimicrobial activity

2013 ◽  
Vol 25 (4) ◽  
pp. 330-338 ◽  
Author(s):  
Anil Kumar Saikia ◽  
Dipak Chetia ◽  
Manuela D’Arrigo ◽  
Antonella Smeriglio ◽  
Tonia Strano ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Chemical Composition ◽  
Essential Oils ◽  
North East India ◽  
North East

scholarly journals Antibacterial Activity of the Essential Oils of Pistacia lentiscus Used in Moroccan Folkloric Medicine

2011 ◽  
Vol 6 (10) ◽  
pp. 1934578X1100601 ◽  
Author(s):  
Fatima Zohra Mharti ◽  
Badiaa Lyoussi ◽  
Abdelfattah Abdellaoui
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Antibacterial Activity ◽  
Essential Oil ◽  
Essential Oils ◽  
Klebsiella Pneumonia ◽  
Pistacia Lentiscus ◽  
Oil Composition ◽  
Strong Activity ◽  
Middle Atlas

The essential oil of the leaves of Pistacia lentiscus, collected from the middle Atlas in Morocco, was analyzed by GC and GC–MS. Altogether 43 components in concentrations of more than 0.2% were identified representing 97.4% of the oil composition. The main constituents were germanicol (12.8%), thunbergol (8.8%), himachalene (7.4%), trans-squalene (6.7%), terpinyl propionate (6.7%), 3,3-dimenthol (6.2%) and cadina-1.4-diene (5.1%). The oils showed strong activity against Klebsiella pneumonia, but no activity against Pseudomonas aeruginosa.

scholarly journals Essential Oils as Post-Harvest Crop Protectants against the Fruit Fly Drosophila suzukii: Bioactivity and Organoleptic Profile

Insects ◽  
2020 ◽  
Vol 11 (8) ◽  
pp. 508 ◽  
Author(s):  
Stefano Bedini ◽  
Francesca Cosci ◽  
Camilla Tani ◽  
Erika Carla Pierattini ◽  
Francesca Venturi ◽  
...  
Keyword(s):  
Essential Oils ◽  
Chemical Constituents ◽  
Insect Pest ◽  
Fruit Fly ◽  
Drosophila Suzukii ◽  
Negative Effects ◽  
Tea Tree ◽  
Post Harvest ◽  
Organoleptic Characteristics ◽  
Low Concentrations

The essential oils extracted from mandarin (Citrus reticulata Blanco) fruits, and from tea tree (Maleleuca alternifolia (Maiden and Betche) Cheel) leaves have been chemically analyzed and tested for their bioactivity against D. suzukii. Besides, to estimate consumers’ acceptability of the essential oil (EO) treatments, we evaluated their impact on the organoleptic characteristics of the EO-treated fruits. The main chemical constituents of the two EOs were 1,8-cineole and 4-terpineol for M. alternifolia (22.4% and 17.6% of the total components, respectively), and limonene (83.6% of the total components) for C. reticulata. The behavioral tests indicate that the two EOs are able to deter D. suzukii oviposition and that D. suzukii shows positive chemotaxis to low concentrations of the EOs and negative chemotaxis when the EO concentration increases. While no negative effects on the organoleptic profiles were detected for fruits treated with C. reticulata EO, the olfactory profile of fruits treated with M. alternifolia EO was so negative that they were defined as “not suitable for consumption” by panellists. Overall, our findings indicate that the use of EOs for the post-harvest protection of small fruits is feasible, provided that the essential oils are selected not only for their bioactivity against the insect pest but also for their affinity with the consumers’ sensorial system.

A comparative analysis of bark and leaf essential oil and their chemical composition, antioxidant, anti-inflammatory, antimicrobial activities and genotoxic potential of North East Indian Cinnamomum zeylanicum Blume

2019 ◽  
Vol 09 ◽  
Author(s):  
Roktim Gogoi ◽  
Neelav Sarma ◽  
Rikraj Loying ◽  
Sudin Kumar Pandey ◽  
Twahira Begum ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Essential Oil ◽  
Essential Oils ◽  
Protein Denaturation ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Cinnamomum Zeylanicum ◽  
North East ◽  
Leaf Essential Oil ◽  
Anti Inflammatory

Background: Cinnamomum zeylanicum Blume bark and leaf essential oil possesses eugenol as the major component. Both the essential oil have the potential antioxidant, anti-inflammatory, antimicrobial and negligible genotoxicity. Objective: A comparative chemical composition and biological evaluation of Cinnamomum zeylanicum Blume, bark and leaf essential oils, originated from North-East India has been investigated in the present study. Methods: Gas chromatography/mass spectroscopy analysis was used to investigate the chemical composition of the essential oil samples. DPPH free radical scavenging activity, reducing power assay was used for antioxidant activity evaluation. Similarly, egg albumin denaturation assay, protease inhibitory activities were used for anti-inflammatory activity, while genotoxicity was evaluated by using Allium cepa assay. Results: The results showed that eugenol is the major component of C. zeylanicum bark (84.48%) and leaf (48.78 %) essential oil. Significant antioxidant activity were observed for both essential oils in the DPPH free radical scavenging assay (IC50= 103.2 μg/mL, bark; IC50= 234.7 μg/mL, leaf), and reducing power assay (absorbance of 1.802 nm, 0.907 nm in 48 µg/mL for bark and leaf essential oil respectively). In-vitro anti-inflammatory activity revealed strong potential of leaf essential oil (protein denaturation assay, IC50= 0.05279 μg/mL; protease inhibitory activity IC50= 3.607 μg/mL) in comparison to bark essential oil (protein denaturation assay IC50= 0.1491, protease inhibitory activity IC50= 61.06). Allium cepa root growth test, mitotic index, and chromosomal aberration test were performed to investigate the genotoxicity of C. zeylanicum bark and leaf essential oil, which resulted no toxic nature of both the essential oils. Antimicrobial activity against eight bacterial and fungal strains revealed good antimicrobial properties with the MIC value of Staphylococcus aureus at 5 μL/mL (bark), Aspergillus niger at 2.5 μL/mL (bark); Bacillus cereus at 5 μL/mL (leaf), Aspergillus niger at 2.5 μL/mL (leaf). Conclusion: Collectively, these findings indicated the strong biological potential of both essential oils, although bark essential possesses better biologically activities than the leaf essential oil and could be used in the food and beverages industries.

Sign in / Sign up

Export Citation Format

Share Document