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Abstract Detail


Physiological Section

Miteva, Lyuba [1], Dimitrova, Petya [2], Ivanov, Sergei [3], Ivanova, Elena [3], Kerchev, Pavel [4], Sergiev, Iskren [3], Ovcharov, Dimitar [2], Alexieva, Vera [3].

Beech weevil (Orchestes fagi L.) affects antioxidant defence of Fagus sylvatica..

Leaf mining insects are serious problem for forest and fruit trees in Europe. The beech weevil (Orchestes fagi L., Coleoptera) is one of the most important pests attacking the leaves of common beech (Fagus sylvatica L.). Larvae feed on the parenchyma tissue of the leaves, which causes inhibition of photosynthetic process and consequently diminish of the trees growth. The scope of this study was to investigate physiological and biochemical changes which occur in the attacked leaves. Tree material was collected from “Petrochan” Experimental Forestry Station. Pairs of opposite leaves, one for control and one which is attacked, equal on age and development phase were selected for the experiments. First experiment was put though during the initial stages of the larvae development, which is 2nd instar. Second experiment was carried out during the larvae 3rd instar. It was found that beech weevil infection did not provoke significant changes in lipid peroxidation marker – malondialdehyde. During the initial stages of the larva development inhibition of the activity of some antioxidant enzymes: superoxide dismutase and catalase was detected but two weeks latter (3rd instar) augmentation of the activities was found. Activation of defense enzymes correlated with the increase of leaf damage index and accumulation of some unspecific defense compounds: free proline and phenolic compounds. Based on our results we concluded that the attacking insect induced specific alteration in antioxidant enzymes and the amounts of some defense compounds. Interestingly, these changes are not accompanied with elevation of the level of oxidative injuries in the common beach leaves. Further investigations on the whole antioxidant system will provide a better understanding of interactions between beach weevil and common beach.


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1 - Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sc, Regulation of Plant Growth and Development, Acad. G. Bonchev str. bl.21, Sofia, 1113, Bulgaria
2 - University of Forestry, Department of Ecology and Landscape Architecture
3 - Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sc, Regulation of Plant Growth and Development
4 - Institut National de la Recherche Agronomique, Laboratoire de Biologie Cellulaire

Keywords:
oxidative stress
antioxidant enzymes
common beech.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P56002
Abstract ID:53


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