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The glucosinolate-myrosinase system in an ecological and evolutionary context
Dan J Kliebenstein1, Juergen Kroymann, Thomas Mitchell-Olds
1Department of Plant Sciences, University of California, Davis, California 95616, USA.
Current Opinion in Plant Biology
|April 30, 2005
Summary
Natural variation in Arabidopsis thaliana reveals key genes in the glucosinolate-myrosinase defense system. Studying these genes in A. thaliana can inform evolutionary models for other crucifer species facing insect predation.
Area of Science:
- Plant biology
- Evolutionary genetics
- Chemical ecology
Background:
- The glucosinolate-myrosinase system is a crucial plant defense mechanism in crucifers.
- Natural genetic variation within this system influences ecological interactions, particularly with insects.
- Arabidopsis thaliana serves as a model organism for dissecting plant genetic pathways.
Purpose of the Study:
- To identify and analyze genes involved in glucosinolate biosynthesis and hydrolysis through natural variation in Arabidopsis thaliana.
- To understand the evolutionary and ecological forces shaping genetic polymorphism in defense-related loci.
- To explore the potential for applying findings from A. thaliana to other crucifer species.
Main Methods:
- Functional analysis of naturally occurring genetic variants in Arabidopsis thaliana.
- Gene cloning to identify specific glucosinolate biosynthesis and hydrolysis genes.
- Comparative analysis of gene variability across different crucifer species.
Main Results:
- Numerous glucosinolate biosynthesis and hydrolysis genes have been identified and cloned in A. thaliana.
- Variation in these genes is central to the function and evolution of the glucosinolate-myrosinase defense system.
- Similar gene variability in other crucifers suggests recurrent selection, likely driven by insect herbivory.
Conclusions:
- Genomic tools in A. thaliana are powerful for detailed evolutionary and ecological studies of plant defense genes.
- Understanding variation in these genes provides insights into plant-insect coevolution.
- Models developed from A. thaliana can be extrapolated to understand defense mechanisms in related species facing similar ecological pressures.
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