Fonctionnement de la plante agressée : impact de l'attaque de Tuta absoluta sur les échanges gazeux foliaires, l'assimilation de l'azote et l'accumulation de composés de défense de la tomate

Abstract : Like other plants, tomatoes are often victim of herbivorous insect. Thus, the use of pesticides remains the most used of the struggling means. In recent years, research aiming to understand the mechanisms by which plants resist to the pests have been intensified. In this context, our objective was to evaluate the early response of tomato during infection by Tuta absoluta, a devastating agent of tomato. We have performed an experimental protocol in order to measure various parameters linked with the assimilation of resources (gas exchange and mineral nitrogen) and the production of plant-defense secondary compounds. The results indicated that infection with T.absoluta affects photosynthesis by reducing net assimilation of CO2, stomatal conductance and transpiration. At the same time, it significantly increases the concentrations of certain polyphenols which insecticide role is not shown yet. This investment in the production of secondary metabolites suggests the involvement of these elements in the defense against T. absoluta. This study is the first of this type; it opens the way to the interest on going further in the studies in order to decrypt the role of these metabolites in the resistance of tomato and mechanism of resource allocation between growth and protection.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2013_MECHAI_IMANE.pdf
Complete list of metadatas

https://hal.univ-lorraine.fr/hal-01778899
Contributor : Memoires Ul <>
Submitted on : Thursday, April 26, 2018 - 9:45:56 AM
Last modification on : Friday, April 27, 2018 - 1:13:55 AM

Identifiers

  • HAL Id : hal-01778899, version 1

Collections

Citation

Imane Mechai. Fonctionnement de la plante agressée : impact de l'attaque de Tuta absoluta sur les échanges gazeux foliaires, l'assimilation de l'azote et l'accumulation de composés de défense de la tomate. Sciences de l'environnement. 2013. ⟨hal-01778899⟩

Share

Metrics

Record views

18