Postinfectional changes of lipids and photosynthesis in Lycopersicon esculentum susceptible to Phytophthora capsici
| Autor: | Marie-Christine Soulié, Gilbert Bompeix, Danielle Laval-Martin, Didier Troton, Pierrette Malfatti |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
biology Fatty acid metabolism food and beverages Fatty acid Galactolipids Plant Science General Medicine biology.organism_classification Lycopersicon Horticulture chemistry.chemical_compound Phytophthora capsici chemistry Chlorophyll Botany Genetics Agronomy and Crop Science Solanaceae Explant culture |
| Zdroj: | Plant Science. 61:169-178 |
| ISSN: | 0168-9452 |
| Popis: | In Lycopersicon esculentum susceptible to Phytophthora capsici we have observed that the lipids of the host and of the parasite displayed different fatty acid compositions: some specific to the plant (16:1 trans , 16:3 and 18:3α), others to the parasite (18:3γ, 20:3, 20:4 and 20:5). In three distinguishable foliar zones: (i) under explant (highly infected tissues), (ii) infected and (iii) apparently non-infected tissues of tomato leaflet, some fatty acids varied such as a function of the distance of the infection point: for example 18:3α decreased by 91% in infected foliar zone, when C20, (totally lacking in healthy tomato leaflets), increased gradually from non-infected to under explant foliar zones. These lipid changes could be used as an infection index. The decrease of 18:3α, fatty acid specific of the galactolipids, was correlated to the disappearance of photosynthetic activities in infected tissues in which chlorophyll contents stayed remarkably stable. These chlorophylls never pheophytinized, were unfunctional for the gathering of light energy for PS II. The in vitro culture of the parasite, in the presence of leaflet extract did not indicate any metabolization of the 18:3α. We finally propose a scheme of the possible effects of the parasitism, on the fatty acid metabolism at the cellular level. |
| Databáze: | OpenAIRE |
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