Prof. Dr. rer. nat. Dr. rer. agr. Christian Ulrichs

Prof. Ulrichs erforscht derzeit geschlossene, ressourceneffiziente Produktionssysteme für Pflanzen und Fische in urbanen Räumen, um Treibhausgasemissionen zu senken und die Widerstandsfähigkeit gegen Klimastress zu erhöhen. Ein Schwerpunkt liegt auf der Entwicklung nachhaltiger Kultursubstrate aus Torfmoos-Biomasse als Peatersatz für den Erwerbsgartenbau sowie auf chemiefreien Schädlingsbekämpfungsmethoden (UV-C-Technologie, Nützlinge, Pheromone) in kontrollierten Anbausystemen. Parallel arbeitet er an der züchterischen Erschließung genetischer Ressourcen — etwa trockenheits- und pilztolerante Weiden, Eschen und Rebsorten — um Pflanzenbestände an Klimaveränderungen anzupassen und alte Sorten wirtschaftlich nutzbar zu machen. Seine Forschung verbindet Gartenbau, Pflanzenzüchtung und integrierte Produktionssysteme mit Fokus auf Praxistransfer in Landwirtschaft und Erwerbsgartenbau.

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• Entwicklung physikalisch wirksamer Insektizide und Acarizide

  Quelle ↗

  Zeitraum: 09/2004 - 09/2007 Projektleitung: Prof. Dr. rer. nat. Dr. rer. agr. Christian Ulrichs

• Ex-situ-Erhaltung salicinreicher Weiden und Anlage eines Modellbestandes für eine nachhaltige Nutzung der biologischen Vielfalt innerhalb der Gattung Salix (II)

  Quelle ↗

  Förderer: Bundesanstalt für Landwirtschaft und Ernährung Zeitraum: 11/2006 - 10/2009 Projektleitung: Prof. Dr. rer. nat. Dr. rer. agr. Christian Ulrichs

• Estatik - giftfreie Pestizide

  Quelle ↗

  Förderer: Bundesministerium für Wirtschaft und Energie Zeitraum: 11/2006 - 05/2009 Projektleitung: Prof. Dr. rer. nat. Dr. rer. agr. Christian Ulrichs

• Physiological and Anatomical Mechanisms in Wheat to Cope with Salt Stress Induced by Seawater

  2020

  Plants · DOI

  Two pot experiments were conducted in a greenhouse to examine 14C fixation and its distribution in biochemical leaf components, as well as the physiological and anatomical adaptability responses of wheat (Triticum aestivum L.) grown with seawater diluted to 0.2, 3.0, 6.0, and 12.0 dS m−1. The results showed significant reductions in chlorophyll content, 14C fixation (photosynthesis), plant height, main stem diameter, total leaf area per plant, and total dry weight at 3.0, 6.0, and 12.0 dS m−1 seawater salt stress. The 14C loss was very high at 12.0 ds m−1 after 120 h. 14C in lipids (ether extract) showed significant changes at 12.0 dS m−1 at 96 and 120 h. The findings indicated the leaf and stem anatomical feature change of wheat plants resulting from adaptation to salinity stress. A reduction in the anatomical traits of stem and leaf diameter, wall thickness, diameter of the hollow pith cavity, total number of vascular bundles, number of large and small vascular bundles, bundle length and width, thickness of phloem tissue, and diameter of the metaxylem vessel of wheat plants was found. In conclusion, salt stress induces both anatomical and physiological changes in the stem and leaf cells of wheat, as well as the tissues and organs, and these changes in turn make it possible for the plants to adapt successfully to a saline environment.

• Ascorbic Acid Induces the Increase of Secondary Metabolites, Antioxidant Activity, Growth, and Productivity of the Common Bean under Water Stress Conditions

  2020

  Plants · DOI

  One of the most vital environmental factors that restricts plant production in arid and semi-arid environments is the lack of fresh water and drought stress. Common bean (Phaseolus vulgaris L.) productivity is severely limited by abiotic stress, especially climate-related constraints. Therefore, a field experiment in split-plot design was carried out to examine the potential function of ascorbic acid (AsA) in mitigating the adverse effects of water stress on common bean. The experiment included two irrigation regimes (100% or 50% of crop evapotranspiration) and three AsA doses (0, 200, or 400 mg L−1 AsA). The results revealed that water stress reduced common bean photosynthetic pigments (chlorophyll and carotenoids), carbonic anhydrase activity, antioxidant activities (2,2-diphenyl-1-picrylhydrazyl free radical activity scavenging activity and 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) radical cation assay), growth and seed yield, while increased enzymatic antioxidants (peroxidase), secondary metabolites (phenolic, flavonoids, and tannins), malondialdehyde (MDA), and crop water productivity. In contrast, the AsA foliar spray enhanced all studied traits and the enhancement was gradual with the increasing AsA dose. The linear regression model predicted that when the AsA dose increase by 1.0 mg L−1, the seed yield is expected to increase by 0.06 g m−2. Enhanced water stress tolerance through adequate ascorbic acid application is a promising strategy to increase the tolerance and productivity of common bean under water stress. Moreover, the response of common bean to water deficit appears to be dependent on AsA dose.