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Abstract Detail


Freund, Forrest D [1], Freyman, William [1], Rothfels, Carl [1].

Inferring the evolution of corm lobation in Isoëtes using Bayesian model-averaged ancestral state reconstruction.

The isoetalean lycophytes are among some of the oldest lineages of extant land plants. While the single contemporary genus, Isoetes L., is a highly reduced and apparently simple plant, the extensive fossil history of this lineage shows that these plants were once far more elaborate, and included complex arborescent forms. However, over evolutionary time, they have undergone serial reduction, resulting in their current diminutive state. This reduction is hypothesized to have continued to the present, with extant Isoetes showing a highly reduced number of basal, root-producing meristems (the number of meristems determines the lobation corm pattern). Using the most recently published Isoetes phylogeny in conjunction with Bayesian model-averaged ancestral state inference, we tested the hypothesis of this evolutionary reduction by reconstructing the history of corm lobation evolution that led to the extant members of the genus.

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1 - U.C. Berkeley, Integrative Biology, 3040 Valley Life Sciences Building #3140, Berkeley, CA, 94720-3140, USA

ancestral state.

Presentation Type: Oral Paper
Session: 6, Pteridological Section/AFS
Location: Sundance 1/Omni Hotel
Date: Monday, June 26th, 2017
Time: 11:15 AM
Number: 6007
Abstract ID:124
Candidate for Awards:None

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