Ulrike Noll

TL;DR: The effectiveness of garlic extract against a range of plant pathogenic organisms was tested in vitro and in planta in diseased tissues and the potential for developing preparations of garlic for use as an alternative to synthetic fungicides for organic food production is discussed.

TL;DR: Treatment with any of the cinnamyl-alcohol dehydrogenase inhibitors decreased the frequency of lignified necrotic host cells and concomitantly led to increased fungal growth, pointing to a causal relationship between the formation of lIGNin precursors and the resistance of wheat to stem rust.

TL;DR: The resistant and the susceptible isoline both exhibit a first maximum in the coordinately regulated enzyme activities of PAL and 4CL at a time when the fungus is still growing on the surface of the leaves, and changes in CAD and PO activities are consistent with a feed-forward regulation by products of the general phenylpropanoid pathway.

TL;DR: Several biotic and abiotic clicitors of the hypersensitive reaction in wheat leaves are described, which induce enhanced activity of phenylalanine ammonia-lyase with subsequent lignification, visible as a yellow autofluorescence.

TL;DR: Evidence is presented here that fragments of the host cell wall, presumably produced enzymatically during fungal penetration, may act as 'endogenous suppressors' of resistance reactions in wheat, and small oligomers of galacturonic acid, thus, are endogenous suppressors of resistance reaction in wheat leaves.