The researches dealt with phenolics in healthy and with Venturia inaequalis infected leaves and fruits. The leaf samples were picked in the period from May to September and the fruit samples at technological maturity. Infection with the Venturia inequalis fungus changed the metabolism of phenolics, which caused their increased synthesis at the infected sites. The peel of fruit and leaves infected with V. inaequalis showed – in comparison to the healthy sample – a more than 4-fold increase in chlorogenic acid, up to 3 times more catechin and up to 4 times more epicatechin.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 5862009With HPLC we have analyzed the leaves, fruit skin and pulp of 6 apple cultivars grown in an integrated and organic production. The experiment was conducted in two consecutive years. We have found a direct impact of organic production on higher phenolic levels in leaves. Partly, organically produced apples also had higher levels of phenolics in skin and in smaller extent in fruit pulp. We conclude that higher content of phenolic compounds in organic production is due to increased stress levels. In addition we have observed significant differences in the phenolics among cultivars and years.
F.18 Transfer of new know-how to direct users (seminars, fora, conferences)
COBISS.SI-ID: 6193017The analysis of phenolics and related enzymes in regard to tissue response to infection with apple scab was studied. Analyses were performed on the skin of the apple cultivars 'Golden Delicious' and 'Braeburn'. Healthy tissue, infected tissue and border tissue was analyzed. In general, we have found significantly higher enzyme activity in infected tissue and border tissue opposed to healthy apple skin. Several times higher contents of phenolic compounds were detected in infected tissue. We conclude that the infection of apple scab causes a non-specific response of the plant to the pathogen.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 6049657