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Physiological stress responses in apple under replant conditions

  • Physiological stress responses in plants that are the key to understanding ongoing biological scenarios were observed in apple seedlings with regards to apple replant disease (ARD). In this study the complexity between ARD, and the influence of the reduction of growth parameters, the influence on the synthesis of valuable, antioxidative compounds, such as phenols, and its interaction with other valuable antioxidative compounds in leaves and other parts of the plants was shown for the first time. The study showed a communication between compounds in roots and leaves which could affect a higher tolerance of plant parts (leaves) against a secondary occurring oxidative stress (in this study induced by paraquat). Seedlings were grown under controlled conditions within a growth chamber. ARD playing a major role in apple fruit production and soil fertility, respectively, was observed as a biotic stress induction factor. Parameters such as photosynthetic activity, antioxidant capacity in the leaves (AC) and total phenolic compounds within the roots were observed to alter significantly under replant conditions. Vegetative growth parameters showed a significantly inhibited development in those plants exposed to replant conditions. Plants having undergone a latent stress through ARD affected soil showed significantly less impact of a secondary oxidative stressor such as the application of paraquat. When exposed to a secondary stressor such as Paraquat the photosynthetic activity (Fv/Fm) within the leaves of those plants did not alter under replant conditions whereas Fv/Fm values decreased in leaves of plants grown in none affected soil. The accumulation of total phenolic compounds within the root of plants grown under replant conditions increased significantly suggesting an ongoing defense mechanism within the host plant. The methodology moves towards early detection of replant disease etiology with the aim of defining first specific ARD related response patterns within apple.

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Document Type:Article
Author:Joana Lua Henfrey, Gerhard Baab, Michaela Schmitz
Parent Title (English):Scientia Horticulturae
First Page:111
Last Page:117
Date of first publication:2015/08/14
This work has been supported by the European Union by the CORE organic II founding through the project Bio-INCROP: Innovative cropping techniques to improve soil health in organic fruit tree orchards, the Dienstleistungszentrum Ländlicher Raum (DLR)- Rheinpfalz, the Bonn-Rhein-Sieg University of Applied Sciences and the University of Bonn (H-BRS), and University of Bonn, Institute of Crop Science and Resource Conservation (INRES-Horticultural sciences).
Tag:Apple replant disease; Oxidative stress; Physiological stress responses in plants; Secondary compounds in plants
Departments, institutes and facilities:Fachbereich Angewandte Naturwissenschaften
Entry in this database:2015/09/09