Phenolic compounds as defence response of pepper fruits to Colletotrichum coccodes |
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| Institution: | 1. University of Ljubljana, Biotechnical Faculty, Department of Agronomy, Chair for Fruit, Wine and Vegetable Growing, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia;2. Agricultural Institute of Slovenia, Hacquetova ulica 17, SI-1000 Ljubljana, Slovenia;1. Gilat Research Center, Agricultural Research Organization, Ministry of Agriculture, Mobile Post Negev 85280, Israel;2. Institute of Biochemistry, Food Science and Nutrition, The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel;3. Department of Postharvest Science, Agricultural Research Organization, Ministry of Agriculture, P.O. Box 6, Bet Dagan 50250, Israel;4. Department of Entomology, Newe Ya’ar Research Center, Agricultural Research Organization, Ministry of Agriculture, P.O. Box 1021, Ramat Yishay 30095, Israel;1. University of Ljubljana, Biotechnical Faculty, Agronomy Department, Chair for Fruit, Viticulture and Vegetable Growing, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia;2. Agricultural Institute of Slovenia, Hacquetova ulica 17, SI-1000 Ljubljana, Slovenia;1. Biotechnical Faculty, Department of Agronomy, University of Ljubljana, Chair for Fruit, Vine and Vegetable Growing, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia;2. Agricultural institute of Slovenia, Hacquetova ulica 17, SI-1000 Ljubljana, Slovenia;1. Division of Fruits and Vegetables Technology, Department of Food Technology, Warsaw University of Life Sciences (SGGW), St. Nowoursynowska 166, 02 787 Warsaw, Poland;2. Department of Fruit, Vegetable and Grain Technology, Wroclaw University of Environmental and Life Sciences, St. Che?moński 37, 51 630 Wroclaw, Poland;1. Defence Institute of High Altitude Research, DRDO, Leh, Jammu and Kashmir, 194101, India;2. Jaypee University of Information Technology, Wakhnaghat, Solan, Himachal Pradesh, 173215, India |
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| Abstract: | Qualitative and quantitative changes of individual and total phenolics induced by Colletotrichum coccodes fungal infection have been studied in two susceptible sweet pepper cultivars ‘Soroksari’ and ‘Bagoly’, and the role of soluble phenolic compounds in plant's defence mechanism has been evaluated. Three distinct parts were analysed on pepper fruit: healthy tissue, anthracnose lesion, and bordering tissue, and individual phenolic compounds have been identified with the use of HPLC-MS system. In pepper fruit pericarp 21 phenolic compounds have been determined; the prevalent apigenin, quercetin and luteolin glycosides, chlorogenic acid and one chrysoeriol glucoside. C. coccodes infection increased the accumulation of chlorogenic acid, chrysoeriol glucoside, quercetin and luteolin glycosides in infected bordering tissue of both analysed pepper cultivars compared to healthy pepper tissue or symptomatic spot. Total apigenin derivatives did not show a significant increase in bordering tissue compared to the healthy pepper fruit in contrast to other groups of phenolics. This suggests a lesser role of apigenin glycosides in pepper plant defence against the Colletotrichum fungus. Intense phenolic synthesis was characteristic for the bordering zone between the healthy and infected plant tissue resulting in higher total phenolic content which might hinder the fungus to spread from the infected cells into the healthy tissue. |
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| Keywords: | Anthracnose Fungal infection Phenolics Defence mechanism |
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