Abstract Detail

Phylogenomics

Rose, Jeffrey [1], Heeg, Luciann [2], Kriebel, Ricardo [2], Codina, Audrey [3], Keefover-Ring, Ken [2], Sytsma, Kenneth [4], Drew, Bryan [5].

Phylogenomics and Evolution of Leaf Volatiles in the California Sages.

The California Sages (Salvia subg. Audibertia) are a small but florally and chemically diverse clade endemic to western North America. They are most speciose in the California Floristic Province where they form an important component of the chaparral and desert communities. Previous analyses based on plastid and nuclear ribosomal DNA supported the reciprocal monophyly of most species as well as the recognition of two sects.: Audibertia and Echinosphace. However, nuclear ribosomal markers suggested some uncertainty as to the monophyly of the entire subgenus. In addition, discordance between the nuclear and plastid genomes implied at least four instances of gene flow between species. More recently, we conducted a genus-wide study using ~100 nuclear loci and nearly complete plastomes. These results largely recapitulated those found initially but suffered from limited sampling of the subgenus. Here, we drastically increase taxonomic sampling within subg. Audibertia, using hundreds of nuclear loci to test its monophyly, resolve previously uncertain intra-subgeneric relationships, and assess gene-tree discordance. We combine this phylogeny with data from leaf volatiles identified using gas chromatography-mass spectrometry. We use these chemical data, gathered from subg. Audibertia and closely related subgenera, to test the hypothesis that speciation in Mediterranean climates has been a key factor in the diversification of volatile compounds.

1 - University of Nebraska at Kearney, 2504 9th Avenue, Kearney, NE, 68849, United States
2 - University of Wisconsin, Botany, 430 Lincoln Drive, Madison, WI, 53706, United States
3 - University of Nebraska at Kearney, Biology, 2504 9th Avenue, Kearney, NE, 68849, United States
4 - University Of Wisconsin, Department Of Botany, Birge Hall, 430 Lincoln Drive, Madison, WI, 53706, United States
5 - University Of Nebraska-Kearney, Biology, 905 W 25th Street, Kearney, NE, 68849, United States

Keywords:
essential oil content
Lamiaceae
cytonuclear discordance
California Floristic Province
Salvia
Mediterranean climate.

Presentation Type: Oral Paper
Number: PHYLO II001
Abstract ID:473
Candidate for Awards:None