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Citation for Study 2103

About Citation title: "Brassicaceae phylogeny inferred from phytochrome A and ndhF sequence data: tribes and trichomes revisited".
About This study was previously identified under the legacy study ID S2106 (Status: Published).


Beilstein M., Al-shehbaz I., Mathews S., & Kellogg E. 2008. Brassicaceae phylogeny inferred from phytochrome A and ndhF sequence data: tribes and trichomes revisited. American Journal of Botany, null.


  • Beilstein M.
  • Al-shehbaz I.
  • Mathews S.
  • Kellogg E.


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 recover 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 Descuraineae are not monophyletic), while 13 of the 23 sampled tribes are monophyletic in PHYA trees. In addition to phylogenetic results, we documented trichome branching pattern from species across the phylogeny and explored the evolution of different trichome morphologies using the AU tests. Our results indicate that dendritic, medifixed, and stellate trichomes likely evolved independently several times in the Brassicaceae.

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