Abstract Detail


Morrison , Glen R [1], Huang, Yi [2], Saavedra, Natalie [2], Sanders, Andrew [2], Stoughton, Thomas [3], Keeley, Jon [4], Parker, V. T. [5], Litt, Amy [6].

Genomic data show genetic distinction among some, but not all species, in the historically puzzling genus Arctostaphylos.

The manzanitas (Arctostaphylos Adans., Ericaceae) are evergreen shrubs and small trees known for their distinctive colorful bark, twisting branches, and urn-shaped flowers. Arctostaphylos is the most species-diverse woody genus in the California Floristic Province (CFP) and shows a high degree of endemism there, with all but a few of the sixty species occurring only in the CFP. Species boundaries in the manzanitas have long been a subject of debate among taxonomists of the group, due to great morphological similarity among many species, interspecific hybridization, and introgression. However, previous genetic analyses were unable to distinguish within- versus among-species variability due to limitations of the sequencing data used and a lack of multiple samples within species. In this study, we used double digest restriction site-associated DNA sequencing to generate thousands of single nucleotide polymorphisms for fifteen manzanita species, including multiple individuals per species. We used distance-based and tree-based methods to assess genetic differentiation among sampled species. Preliminary results from this study demonstrate that many species are genetically coherent and distinct, while others appear genetically intermixed with one or more other species. However, these data are still preliminary, and additional sampling and inclusion of other lines of evidence are needed to assess whether these species are distinct.

1 - University of California, Riverside, Botany and Plant Sciences, 900 University Ave, Riverside, CA, 92521, United States
2 - University of California, Riverside, 900 University Ave, Riverside, CA, 92521, United States
3 - Plymouth State University, 17 High St, Plymouth, NH, 03264
4 - United States Geological Society, Western Ecological Research Center - Sequoia and Kings Canyon Field Station, 47050 Generals Highway, Three Rivers, CA, 93271-9651, USA
5 - San Francisco State University, Biology, 1600 Holloway Avenue, Department Of Biology, San Francisco, CA, 94132, United States
6 - University Of California, Riverside, Botany And Plant Sciences, 900 University Avenue, Riverside, CA, 92521, United States

none specified

Presentation Type: Oral Paper
Session: SYS2, Systematics II: Rosids part B to Basal Asterids
Location: Virtual/Virtual
Date: Tuesday, July 28th, 2020
Time: 1:45 PM
Number: SYS2006
Abstract ID:499
Candidate for Awards:None

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