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Change of phenolic compounds pattern in Nicotiana species as a response to wounding and viral infection

Quantitative and qualitative changes of phenolic compounds were compared in wounded and in Cucumber mosaic virus containing satellite RNA infected Nicotiana species. Significant changes in total phenolics (TP) content were analysed in N. megalosiphon, N. glutinosa and N. tabacum var. Samsun at four different time intervals. The highest decrease of TP was detected in wounded N. megalosiphon plants while the highest increase of TP was detected in infected N. megalosiphon plants. Depending on treatment and time, significant increase or decrease of caffeic acid, quercetin or kaempferol was detected in investigated species. The strongest increase in quercetin concentration was observed in infected N. glutinosa plants. The largest number of significant changes of caffeic acid, quercetin and kaempferol concentration in analysed time intervals was observed in infected N. megalosiphon plants. Defence response to wounding in all investigated Nicotiana species resulted in a significant decrease of detected phenolics content. Changes of detected phenolics in virus infected plants were characteristic for each species which suggested that each species activated different defence response to the virus infection. Observed changes of phenolics are obviously responses to wounding and virus infection, which could probably be involved in activating distinct defence response to a specific stress.

abiotic stress; biotic stress; plant-pathogen interaction; Cucumber mosaic virus; satellite RNA; flavonoids; hydroxycinnamic acids; HPLC

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