Overcoming Replant Disease by an Integrated Approach
Project number: 031B0512A-J
Contact: Prof. Dr. Traud Winkelmann, Leibniz Universität Hannover
Project team: Leibniz Universität Hannover, German Research Center for Environmental Health, Helmholtz Centre for Environmental Research – UFZ, Bonn-Rhein-Sieg University of Applied Sciences, Humboldt-Universität zu Berlin, Julius Kühn Institute, Horticultural Center Schleswig-Holstein, Leibniz Centre for Agricultural Landscape Research, Rheinische Friedrich-Wilhelms-Universität Bonn, Technische Universität Dortmund, Institut für Pharmazeutische Biologie - Technische Universität Braunschweig
Duration: 01.01.2019 - 31.12.2021
Link Website: www.ordiamur.de
1. Prediction of presence or absence of soil decline by bio-tests, plant and soil indicators.
2. Overcoming replant disease by:
-> Measures to increase the microbial diversity in the soil
-> Breeding of rootstocks with tolerance against replant disease
-> Inoculation of plants with beneficial endophytes to achieve “immunization”
3. Implementation of operational innovations into considerations of social economic prerequisites.
4. Transfer of the ORDIAmur consortium results into public (internet platform).
project results from phase 1
• ARD develops on all soils, but its severity differs depending on soil characteristics with light (i.e. sandy) soils leading to more severe ARD
• When grown in ARD soil, apple roots express an extraordinary stress response, which is characterized in detail in terms of the metabolites.
• Root morphology and root endophytic communities undergo severe changes in ARD soils.
• Isolated endophytic bacteria and fungi from roots grown in ARD soils are available and can now be tested for their interaction with the plant or
potential causal agents
• Among the proposed causal agents of the ARD disease complex, nematodes and their associated microbiome, bacterial genera in the
rhizosphere (Streptomycetaceae and others) as well as inside apple roots (Streptomyces), fungal genera of the family Nectriaceae and
oomycetes in the rhizosphere were identified as important actors.