GIORDANENGO , Philippe

Electrical penetration graph (EPG) technique is a powerful tool to investigate the hidden feeding behavior of piercing-sucking insects allowing to link recorded EPG waveforms to stylet penetration and complex behaviors related to feeding activities occurring within plant tissue. Calculating the numerous EPG parameters necessary to unravel the...

Viral diseases non-persistently transmitted by aphids are of great economic importance in several annual crops. Transmission efficiency of these non-persistent phytoviruses is dependant on vector efficiency (i.e. vector intrinsic ability to transmit the virus) but also on the vector activity that implies the early steps of aphid host plant...

The aim of this investigation was the preparative isolation of solanidine (aglycone of the two main potato glycoalkaloids:alpha-chaconine and alpha-solanine) from fresh Solanum tuberosum (cv. Pompadour) material by implementing a new preparation scheme using centrifugal partition chromatography (CPC). A setup for obtaining solanidine by...

Cet ouvrage présente les grandes fonctions des insectes, leur fonctionnement individuel et collectif, leurs interactions plus ou moins intimes avec les composantes de l'écosystème, en particulier les plantes, en s'appuyant sur l'histoire évolutive à l'origine de ces interactions. Il décrit les multiples applications des recherches sur les...

L'utilisation de variétés de plantes résistantes constitue un moyen de lutte majeur contre les insectes ravageurs, une alternative particulièrement séduisante à l'utilisation de pesticides dont les résidus sont dommageables tout autant pour la santé des consommateurs que pour l'environnement. La résistance est considérée ici comme l'aptitude...

La résistance des plantes en agriculture: - Succès et difficultés de la sélection classique - Bilan de la transgénèse - Les inhibiteurs de protéases - Les inhibiteurs d'α-amylases - Les lectines - Les chitinases - Autres gènes Gestion durable de la résistance: - Définition et enjeux - Gestion des gènes in planta - Déploiement des gènes - Choix...

The main glycoalkaloids of a commercial potato cultivar, alpha-chaconine and alpha-solanine, were extracted from sprouts of Solanum tuberosum cv. Pompadour by a mixture of MeOH/H2O/CH3COOH (400/100/50, v/v/v). In these conditions, 2.8 +/- 0.62 g of crude extract were obtained from 50g of fresh sprouts and the total glycoalkaloid content was...

Rhagoletis completa Cresson (Diptera: Tephritidae) is native to North America and invaded Western Europe in the late 1980s, causing important damage to its principal host, walnut (Juglans spp.). In this review, we summarize the important elements of R. completa's biology, phytosanitary status and methods used in Europe for its control, and then...

Feeding behavior of three leafhopper species - Erythroneura vitis (Harris), Erythroneura ziczac (Walsh), and Erythroneura elegantula (Say) (Hemiptera: Cicadellidae) - reared on grapevine, Vitis vinifera L. cv. 'Seyval blanc' (Vitaceae), was investigated using histological techniques and DC-electrical penetration graphs (DC-EPG). Histological...

Aphids attack virtually all plant species and cause serious crop damages in agriculture. Despite their dramatic impact on food production, little is known about the molecular processes that allow aphids to exploit their host plants. To date, few aphid salivary proteins have been identified that are essential for aphid feeding, and their nature...

Background Potato (Solanum tuberosum) is the fourth culture in the world and is widely used in the agri-food industries. They generate by-products in which alpha-chaconine and alpha-solanine, the two major solanidine-based glycoalkaloids of potato, are present. As secondary metabolites, they play an important role in the protection system of...