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Disarming the mustard oil bomb
Andreas Ratzka1, Heiko Vogel, Daniel J Kliebenstein
1Department of Genetics and Evolution, Max Planck Institute for Chemical Ecology, Winzerlaer Strasse 10, 07745 Jena, Germany.
Summary
Diamondback moths possess a glucosinolate sulfatase enzyme that neutralizes the Brassicaceae plant defense system. This adaptation allows these insects to feed on a wide variety of cruciferous plants.
Area of Science:
- Plant-insect interactions
- Biochemistry
- Chemical ecology
Background:
- Plants, including Brassicaceae, utilize defensive compounds like glucosinolates to deter herbivores.
- The glucosinolate-myrosinase system, often termed the "mustard oil bomb," is a key defense mechanism in these plants.
- Specialist insects have evolved counter-strategies to overcome plant defenses.
Purpose of the Study:
- To investigate the mechanism by which the diamondback moth, Plutella xylostella, overcomes the glucosinolate-myrosinase defense system in Brassicaceae plants.
- To characterize the role of glucosinolate sulfatase in enabling diamondback moth herbivory.
Main Methods:
- Enzyme assays to determine the activity of glucosinolate sulfatase.
- Analysis of glucosinolate hydrolysis products in the presence and absence of the enzyme.
- Host plant range studies of Plutella xylostella.
Main Results:
- Diamondback moths possess a glucosinolate sulfatase enzyme.
- This enzyme effectively prevents the formation of toxic hydrolysis products from glucosinolates.
- The sulfatase exhibits broad activity against major classes of glucosinolates.
Conclusions:
- Glucosinolate sulfatase is a crucial adaptation enabling diamondback moths to utilize a wide array of cruciferous plants as hosts.
- This enzymatic detoxification mechanism highlights the co-evolutionary arms race between plants and herbivores.