Brassicaceae phylogeny inferred from phytochrome A and ndhF sequence data: Tribes and trichomes revisited

Mark A. Beilstein, Ihsan A. Al-Shehbaz, Sarah Mathews, Elizabeth A. Kellogg

Research output: Contribution to journalArticle

135 Scopus citations

Abstract

The family Brassicaceae comprises 3710 species in 338 genera, 25 recently delimited tribes, and three major lineages based on phylogenetic results from the chloroplast gene ndhF. To assess the credibility of the lineages and newly delimited tribes, we sequenced an approximately 1.8-kb region of the nuclear phytochrome A (PHYA) gene for taxa previously sampled for the chloroplast gene ndhF. Using parsimony, likelihood, and Bayesian methods, we reconstructed the phylogeny of the gene and used the approximately unbiased (AU) test to compare phylogenetic results from PHYA with findings from ndhF. We also combined ndhF and PHYA data and used a Bayesian mixed model approach to infer phylogeny. PHYA and combined analyses recovered the same three large lineages as those recovered in ndhF trees, increasing confidence in these lineages. The combined tree confirms the monophyly of most of the recently delimited tribes (only Alysseae, Anchonieae, and Descurainieae are not monophyletic), while 13 of the 23 sampled tribes are monophyletic in PHYA trees. In addition to phylogenetic results, we documented the trichome branching morphology of species across the phylogeny and explored the evolution of different trichome morphologies using the AU test. Our results indicate that dendritic, medifixed, and stellate trichomes likely evolved independently several times in the Brassicaceae.

Original languageEnglish (US)
Pages (from-to)1307-1327
Number of pages21
JournalAmerican journal of botany
Volume95
Issue number10
DOIs
StatePublished - Oct 1 2008
Externally publishedYes

Keywords

  • Approximately unbiased test
  • Arabidopsis
  • Brassica
  • Brassicaceae
  • PHYA
  • Phylogeny
  • Trichomes
  • ndhF

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Plant Science

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