Affiliation:
1. Department of Plant Physiology RWTH Aachen University Aachen Germany
2. Department of Molecular Phytomedicine University of Bonn Bonn Germany
3. Department of Bioprocesses and Bioanalytics Research Center Jülich GmbH Jülich Germany
4. BASF Plant Science Company GmbH Agricultural Center Limburgerhof Germany
Abstract
SummaryCoumarins can fight pathogens and are thus promising for crop protection. Their biosynthesis, however, has not yet been engineered in crops. We tailored the constitutive accumulation of coumarins in transgenic Nicotiana benthamiana, Glycine max and Arabidopsis thaliana plants, as well as in Nicotiana tabacum BY‐2 suspension cells. We did so by overexpressing A. thaliana feruloyl‐CoA 6‐hydroxylase 1 (AtF6’H1), encoding the key enzyme of scopoletin biosynthesis. Besides scopoletin and its glucoside scopolin, esculin at low level was the only other coumarin detected in transgenic cells. Mechanical damage of scopolin‐accumulating tissue led to a swift release of scopoletin, presumably from the scopolin pool. High scopolin levels in A. thaliana roots coincided with reduced susceptibility to the root‐parasitic nematode Heterodera schachtii. In addition, transgenic soybean plants were more tolerant to the soil‐borne pathogenic fungus Fusarium virguliforme. Because mycotoxin‐induced accumulation of reactive oxygen species and cell death were reduced in the AtF6’H1‐overexpressors, the weaker sensitivity to F. virguliforme may be caused by attenuated oxidative damage of coumarin‐hyperaccumulating cells. Together, engineered coumarin accumulation is promising for enhanced disease resilience of crops.
Funder
Deutsche Forschungsgemeinschaft
Subject
Plant Science,Agronomy and Crop Science,Biotechnology
Cited by
1 articles.
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