2006/06/05 by Markus Benderoth, Susanne Textor, Aaron J. Windsor +3 · 1 citation
Biochemistry, Genetics and Molecular Biology · Agricultural and Biological Sciences · #Genomics, phytochemicals, and oxidative stress #Nitrogen and Sulfur Effects on Brassica #Plant Parasitism and Resistance
paper · doi:10.1073/pnas.0601738103
openalex publication_date 2006/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In Arabidopsis thaliana and related plants, glucosinolates are a major component in the blend of secondary metabolites and contribute to resistance against herbivorous insects. Methylthioalkylmalate synthases (MAM) encoded at the MAM gene cluster control an early step in the biosynthesis of glucosinolates and, therefore, are central to the diversification of glucosinolate metabolism. We sequenced bacterial artificial chromosomes containing the MAM cluster from several Arabidopsis relatives, conducted enzyme assays with heterologously expressed MAM genes, and analyzed MAM nucleotide variation patterns. Our results show that gene duplication, neofunctionalization, and positive selection provide the mechanism for biochemical adaptation in plant defense. These processes occur repeatedly in the history of the MAM gene family, indicating their fundamental importance for the evolution of plant metabolic diversity both within and among species.