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Abstract Detail


Cohen, Jim [1].

An updated phylogeny of Lithospermum L. (Boraginaceae): Using hundreds of DNA regions to resolve evolutionary relationships.

Lithospermum L. (Boraginaceae) is a medium-sized, cosmopolitan genus with diverse vegetative, floral, and pollen morphology. The phylogenetics of the genus have been investigated using multiple chloroplast DNA (cpDNA) regions and the nuclear ribosomal Internal Transcribed Spacer (ITS), and the resolved phylogenetic relationships have differed depending the loci and taxon combinations employed. In Boraginaceae, loci from the nuclear genome have not been often explored for phylogenetics, yet these can provide a more robust phylogeny due to the use of multiple independent regions. Using hundreds of DNA regions from across the nuclear genome, phylogenetic relationships of Lithospermum and relatives were reconstructed using multiple methods. The resulting phylogenies resolved similar evolutionary relationships for analyses of concatenated regions and those based on phylogenies examined with coalescent methods. While evolutionary relationships were overall quite similar across the investigated nuclear regions, phylogenetic relationships differed to a larger extent between phylogenies reconstructed from the nuclear DNA regions and those from cpDNA loci. Given a lack of a compelling evidence for all but one cause of incongruence, incomplete lineage sorting (ILS) appears to be the cause for the different phylogenetic relationships between the two genomes. Additionally, heterostyly arose multiple times in the genus, and corolla length increased multiple times independently. Lithospermum also is resolved to have originated in the Old World and colonized eastern North America before dispersing westward.

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1 - Weber State University, Botany and Plant Ecology, 1415 Edvalson St., Dept. 2504, Ogden, UT, 84408, USA

Targeted enrichment.

Presentation Type: Oral Paper
Session: SYSTII, Systematics II: Basal Asterids & Euasterids I
Location: Virtual/Virtual
Date: Tuesday, July 20th, 2021
Time: 1:00 PM(EDT)
Number: SYSTII003
Abstract ID:205
Candidate for Awards:None

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