Journal
AMERICAN JOURNAL OF BOTANY
Volume 95, Issue 10, Pages 1307-1327Publisher
WILEY
DOI: 10.3732/ajb.0800065
Keywords
approximately unbiased test; Arabidopsis; Brassica; Brassicaceae; ndhF; PHYA; phylogeny; trichomes
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Funding
- National Science Foundation [DEB-0408104]
- National Geographic [7405-03, 7452-03]
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The family Brassicaceae comprises 37 10 species in 338 genera, 25 recently delimited tribes, and three major lineages based on phylogenetic results front 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 (or 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 phylogenctic 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.
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