On the monophyly of Macrolobium Schreb., an ecologically diverse neotropical tree genus (Fabaceae-Detarioideae)
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Author(s)
Murphy, B
De la Estrella, M
Schley, R
Forest, F
Klitgard, B
Type
Journal Article
Abstract
Premise of research. The Neotropical endemic Macrolobium is one of the most species-rich genera (ca. 75 species) within subfamily Detarioideae (Fabaceae, alternatively Leguminosae). Two sections distinguished by floral morphology have been recognized in the past. Although morphologically diverse, species within the genus share several characters, including a single well-developed petal in adaxial position. However, previous analyses based on plastid markers have suggested that the genus is not monophyletic. We produce the most densely sampled molecular phylogeny of Macrolobium and test the monophyly of the genus and the two sections. Methodology. We analyzed nucleotide sequence data from the nuclear ribosomal internal transcribed spacer (ITS) and plastid (matK, trnG) genomes using Bayesian and maximum likelihood analyses. Pivotal results. The combined analysis retains Macrolobium as a monophyletic genus, with two well-supported subclades corresponding to the two recognized sections. Macrolobium pendulum is the only species placed in a section different from its taxonomic treatment. The relationships recovered with the plastid markers differ slightly from the combined and ITS analyses, but without significant support. Conclusions. Macrolobium is shown to be a monophyletic genus and to contain two well-supported and morphologically defined sections with differing Amazonian and Andean/Central American distributions corresponding to the Gentry pattern. Species are also found to group partly according to habitat preferences and leaf morphology. Both sections contain groups of multijugate and unijugate species, and there appear to have been multiple shifts of this character.
Date Issued
2017-12-13
Online Publication Date
2018-12-13T07:00:17Z
Date Acceptance
2017-10-01
ISSN
1058-5893
Publisher
University of Chicago Press
Start Page
75
End Page
86
Journal / Book Title
International Journal of Plant Sciences
Volume
179
Issue
1
Copyright Statement
© 2017 by The University of Chicago. All rights reserved.
Source Database
manual-entry
Subjects
Science & Technology
Life Sciences & Biomedicine
Plant Sciences
Amazon
Andes
biogeography
Brownea clade
Leguminosae
phylogenetics
LEGUMINOSAE-CAESALPINIOIDEAE
PHYLOGENETIC ANALYSIS
MOLECULAR-DATA
ANDEAN UPLIFT
BROWNEA CLADE
DETARIEAE
EVOLUTION
SEQUENCES
MORPHOLOGY
TORTOISE
0607 Plant Biology
0603 Evolutionary Biology
Evolutionary Biology
Publication Status
Published