The general objective of the research is to improve our understanding of organic matter stabilisation in soil. In addition to well established mechanisms of soil organic matter stabilisation such as bonding to minerals or inclusion in aggregates, the applicants recently have disclosed significant and varying antibiotic/antioxidative properties, which could confer inherent chemical stability. However, the molecular fundamentals of these properties are currently unknown. Therefore, specific objectives are: -Quantify antibiotic/antioxidant capacity of soil organic matter in a number of soils from experimental work in the UK and Germany.-Molecular characterisation and quantification of potential antibiotic and/or antioxidant molecules in those soils.-Assess the extent to which the molecules in (2) can account for the measured capacities in (1).-Assess the extent to which the molecules in (2) have been derived from lignin, tannin and/or other plant constituents.-Investigate which enzymatic reactions are affected by the effective molecules identified in (2) to (4).
Pflanzen können sich durch eine Vielzahl von Mechanismen vor radikalinduziertem Stress schützen. Ziel dieses Projektes ist es, die Bedeutung des Calciumcalmodulin-Systems für die Aktivierung antioxidativ wirkender Enzyme wie der Superoxiddismutase, Katalase und Ascorbatperoxidase sowie die Konzentrationen der Radikalfänger Vitamin C, Vitamin E, Glutathon und Carotinoiden herauszustellen. Als Modellsystem wird die Empfindlichkeit von Erdbeerblättern gegenüber radikalinduziertem Stress durch Ozon untersucht