Original research articles

Composition and content of fatty acids in Vitis vinifera L. var. Cabernet Sauvignon leaves infected with the eutypiosis fungus, Eutypa lata

Abstract

On Cabernet sauvignon, eutypiosis sensible variety, we have compared fatty acids content in healthy Jeaves (S: leaves beared by healthy vine stock), in leaves seeming healthy (Ap.S: leaves beared by arm without symptoms, the other arm is diseased) and in diseased leaves (M: leaves beared by diseased arm). The results show that disease does not alter the fatty acids order. Linolenic acid (CI 8:3) content is always the most important, followed by palmitic (CI6:0) and Iinoleic acids, then by stearic (CI8:0) and oleic acids and at last by arachidic acid (C20:0). During the three stages studied (flowers buds: H, flowering: I and closed cluster: L), only the development of CI 8:3 content was modified by disease. It increases in healthy leaves at stage I, while in Ap.S and M leaves there is a decrease from H to L stages. Otherwise, development of fatty acids proportions does not seem to be changed by eutypiosis.

Proportions and content comparison in S, Ap.S and M leaves show a decrease of C 18:3 synthesis benefit of C 18:2.

This increases is important as well as the symptoms are evident. These results seem to be in relationship with decrease of leaves size caused by eutypiosis. At the end, the disease induces a desaturation decrease of C18:0 and C18:2 as well as an aliphatic chain lengthening of C16:0. These inhibitions are showed by more increase of CI 6:0 and CI 8:2 in diseased leaves than in healthy leaves. No action is observed in CI 8: 1 desaturation.

Authors


Tayeb Koussa

Affiliation : Laboratoire de biologie et biotechnologie végétales, Faculté des sciences, Université Chouaib Doukkali, 24000 El Jadida, Maroc

koussatayeb@hotmail.com

Monique Cherrad

Affiliation : Laboratoire des Sciences de la Vigne, Université Bordeaux I, Avenue des Facultés, 33405 Talence, France


Driss Zaoui

Affiliation : Laboratoire de Biochimie Métabolique. Département de Biologie, Université Chouaib Doukkali, Faculté des Sciences, 24000 El Jadida (Maroc)


Michel Broquedis

Affiliation : Institut des sciences de la vigne et du vin (ISVV), Institut fédératif de recherche (IFR), Unité mixte de recherche (UMR) santé végétale, Institut national de la recherche agronomique (INRA), Centre de recherches de Bordeaux. B.P. 81, 33883 Villenave d'Ornon

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