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Doctoral Thesis
2016
The biocontrol agent Fusarium oxysporum f. sp. strigae - Monitoring its environmental fate and impact on indigenous fungal communities in the rhizosphere of maize
The biocontrol agent Fusarium oxysporum f. sp. strigae - Monitoring its environmental fate and impact on indigenous fungal communities in the rhizosphere of maize
Abstract (English)
The fungal biocontrol agent (BCA) Fusarium oxysporum f. sp. strigae (Fos) has proven to be effective in the suppression of the parasitic weed Striga hermonthica, which causes substantial yield losses in cereals in Sub-Saharan Africa. A prerequisite for widespread implementation of the biocontrol technology is the official registration of the BCA Fos by country authorities in Sub-Saharan Africa. The FAO and OECD institutions established international registration regulations to ensure the environmental safety of microbial BCAs. The present thesis aimed on assessing the potential of the BCA Fos to meet these registration requirements and was, therefore, based on the following two major objectives:
(1) A specific DNA-based monitoring tool for Fos was developed which allows following its population kinetics in soils as driven by contrasting environmental impacts, such as soil type, plant growth stage and seasonality.
(2) Risk assessment studies were conducted to assess potential side effects of Fos inoculation on non-target soil microorganisms.
Abstract (German)
Der pilzliche Biokontrollagent (BKA) Fusarium oxysporum f. sp. strigae Stamm “Foxy-2” stellt eine wirksame Kontrollmöglichkeit gegen das parasitäre Unkraut Striga hermonthica dar, welches beachtliche Getreideverluste in Sub-Sahara Afrika verursacht. Voraussetzung für den großflächigen Einsatz dieser biologischen Unkrautkontrolle ist die offizielle Registrierung des BKA “Foxy-2” durch Länderbehörden in Sub-Sahara Afrika. Die FAO und OECD entwickelten internationale Regularien für die Registrierung von mikrobiellen BKA um die Umweltverträglichkeit dieser biologischen Pestizide zu gewährleisten. Die Hauptziele der vorliegenden Dissertation basierten deshalb auf den Anforderungen dieser internationalen Regularien: (1) Eine spezifische Detektionsmethode wurde entwickelt, durch die der BKA in inokulierten Umgebungen identifiziert und quantifiziert werden kann. (2) Risikoanalysen wurden durchgeführt um nachteilige Effekte auf nicht-Ziel Organismen durch die Inokulation mit dem BKA auszuschließen.
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Notes
Publication license
Publication series
Published in
Faculty
Faculty of Agricultural Sciences
Institute
Institute for Plant Production and Agroecology in the Tropics and Subtropics
Examination date
2016-12-18
Supervisor
Edition / version
Citation
Identification
DOI
ISSN
ISBN
Language
English
Publisher
Publisher place
Classification (DDC)
630 Agriculture
Original object
Standardized keywords (GND)
Sustainable Development Goals
BibTeX
@phdthesis{Zimmermann2016,
url = {https://hohpublica.uni-hohenheim.de/handle/123456789/6132},
author = {Zimmermann, Judith},
title = {The biocontrol agent Fusarium oxysporum f. sp. strigae - Monitoring its environmental fate and impact on indigenous fungal communities in the rhizosphere of maize},
year = {2016},
school = {Universität Hohenheim},
}