Positive selection driving diversification in plant secondary metabolism.

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Benderoth, M; Textor, S; Windsor, AJ; Mitchell-Olds, T; Gershenzon, J; Kroymann, J

Published Date

  • June 5, 2006

Published In

Volume / Issue

  • 103 / 24

Start / End Page

  • 9118 - 9123

PubMed ID

  • 16754868

Pubmed Central ID

  • 16754868

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.0601738103

Language

  • eng