Variability of polyphenolic extracts from different oil palm trees and evaluation of their effect on <i>Coelaenomenodera lameensis</i> (Coleoptera, Chrysomelidae) larvae

Abstract

Coelaenomenodera lameensis is an insect and the major pest of the oil palm. In case of strong attack, it causes up to 50% loss of production. Larval development of C. lameensis is more pronounced on sensitive palm tree Elaeis guineensis originating from La Mé, Yocoboué and Deli compared to tolerant palm trees Elaeis oleifera originating from Central American. The objective of this work is to study the variability content of polyphenols from different palm trees and their effect on the larvae of C. lameensis. To do this, the extracts from the leaflets of these palms were analyzed by HPLC and tested on larvae of the leaf miner. Considering the results, HPLC analysis has revealed additional peaks polyphenols characterizing trees palm Elaeis oleifera tolerant, the retention time of 22.9, 26.4 and 30.4 min. Furthermore, bio-essays conducted on the larvae of Coelaenomenodera lameensis showed differential mortality of these larvae following the origin, the time and the concentration of applied chemical extracts. Indeed, this result indicates that the molecules in the three characteristic peaks are probably potential polyphenols and are in charge of tolerance to C. lameensis.

Inhibition Effects of Elaeis oleifera (Arecaceae) and Launaea taraxacifolia (Asteraceae) on Two Genotypes of Anopheles gambiae Larvae

“…Elaeis oleifera also contains mucilages and alkaloids that are not found in Launaea taraxacifolia. These results are in line with those obtained in the previous work carried out by Fagbohoun et al (2015) and Koukoui et al (2015).…”

“…However, this species showed the lowest LC 50 (51.38 ppm) of all the bioassays carried out during the 48 hrs of contact with the Kisumu larvae. This potential for inhibition, in line with the resistance of this plant attacks by the larvae of Coelaenomenodera lameensis, an oil palm leafminer, has been demonstrated by Fagbohoun et al (2015). It is all the more interesting in terms of toxicity to larvae of anopheles Kisumu, as shown by Aouinty et al (2006), with the lowest LC 50 , 530 ppm and 600 ppm, those of extracts of Tetraclinis articulata and Ricinus communis on mosquitoes of Culex pipiens, Anopheles caspius, Culex longiareolata and Anopheles maculipennis.…”

“…In addition, recent studies in Benin have investigated the activities of polyphenol-rich plants on larvae of parasitic insects such as Launaea taraxacifolia on Anopheles gambiae larvae (Ahouansou et al, 2016) and Elaeis oleifera on the larvae of Coelaenomenodera lameensis. Elaeis oleifera is a species of palm tree that is resistant to the attacks of Coelaenomenodera lameensis larvae among the various oil palm genotypes due to its rich polyphenolic compounds (Fagbohoun et al, 2015). In addition, Launaea taraxacifolia is known and domesticated in all West African countries (Adebisi, 2004).…”

Effets de la consommation de petites doses de cacao sur les pressions artérielles selon leurs valeurs de base, chez des noirs africains

“…Les flavanols, molécules organiques de type flavonoïde de la famille des polyphénols (Ding et al, 2006;Arora et al, 2019) sont retrouvés en quantité variable dans les plantes (Amonkan et al, 2010;Fagbohoun et al, 2015;Nguemo Dongock et al, 2018) et dans les fruits et légumes (Amiot et al, 2012). Ils stimulent la production endothéliale de NO entrainant ainsi une baisse des résistances vasculaires.…”

Mosquitoes' larvicidal activity of Phoenix dactylifera Linn extracts against Aedes aegypti

“…aegypti and Ae. albopictus [13] . Negative consequences had been noted whenever conventional synthetic pesticides like carbamates, organochlorines and organophosphates were dispersed in the environment causing serious toxicity to human health, contaminated agricultural products, and development of resistance to commonly used insecticides [14] .…”