The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America

Two monotypic genera of Mimosoideae from southern South America, Mimozyganthus and Piptadeniopsis, have been particularly difficult to classify and there has been disagreement about their relationships to other legume genera. We undertook a phylogenetic study based on molecular data from the chlorop...

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Autores principales:	Luckow, M., Fortunato, R.H., Sede, S., Livshultz, T.
Formato:	JOUR
Materias:	Caesalpinioideae Leucaena Mimosoideae Prosopidastrum Prosopis
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03636445_v30_n3_p585_Luckow
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

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spelling	todo:paper_03636445_v30_n3_p585_Luckow2023-10-03T15:27:33Z The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America Luckow, M. Fortunato, R.H. Sede, S. Livshultz, T. Caesalpinioideae Leucaena Mimosoideae Prosopidastrum Prosopis Two monotypic genera of Mimosoideae from southern South America, Mimozyganthus and Piptadeniopsis, have been particularly difficult to classify and there has been disagreement about their relationships to other legume genera. We undertook a phylogenetic study based on molecular data from the chloroplast and nucleus, and synthesized it with new data from morphology, cytology, and palynology in order to determine where these genera belong in the mimosoid phylogenetic tree. Mimozyganthus, an enigmatic genus whose unique morphology led workers to consider it transitional between the subfamilies Mimosoideae and Caesalpinioideae, is instead nested among the higher mimosoids on the molecular tree. Careful evaluation of the characters that were considered to be caesalpinioid-like reveals that they are not identical and are independently derived. Piptadeniopsis is most closely related to Prosopidastrum, a primarily Argentinian genus with lomentiform fruits. This is in close agreement with most morphological characters, although the pollen is different in the two genera. Piptadeniopsis, Mimozyganthus, and Prosopidastrum form a monophyletic group on all molecular trees, a result consistent with vegetative and fruiting morphology, but not floral characters. Although the relationship of this group to other taxa is unresolved in the individual molecular analyses, a combined analysis of all molecular data for a subset of the taxa reveals that the three taxa are more closely related to the Leucaena group than to Prosopis. We hypothesize that the unique floral characters of Mimozyganthus may have evolved in response to pollinator selection, and a pollination study is needed to test this hypothesis. © Copyright 2005 by the American Society of Plant Taxonomists. Fil:Sede, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03636445_v30_n3_p585_Luckow
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Caesalpinioideae Leucaena Mimosoideae Prosopidastrum Prosopis
spellingShingle	Caesalpinioideae Leucaena Mimosoideae Prosopidastrum Prosopis Luckow, M. Fortunato, R.H. Sede, S. Livshultz, T. The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
topic_facet	Caesalpinioideae Leucaena Mimosoideae Prosopidastrum Prosopis
description	Two monotypic genera of Mimosoideae from southern South America, Mimozyganthus and Piptadeniopsis, have been particularly difficult to classify and there has been disagreement about their relationships to other legume genera. We undertook a phylogenetic study based on molecular data from the chloroplast and nucleus, and synthesized it with new data from morphology, cytology, and palynology in order to determine where these genera belong in the mimosoid phylogenetic tree. Mimozyganthus, an enigmatic genus whose unique morphology led workers to consider it transitional between the subfamilies Mimosoideae and Caesalpinioideae, is instead nested among the higher mimosoids on the molecular tree. Careful evaluation of the characters that were considered to be caesalpinioid-like reveals that they are not identical and are independently derived. Piptadeniopsis is most closely related to Prosopidastrum, a primarily Argentinian genus with lomentiform fruits. This is in close agreement with most morphological characters, although the pollen is different in the two genera. Piptadeniopsis, Mimozyganthus, and Prosopidastrum form a monophyletic group on all molecular trees, a result consistent with vegetative and fruiting morphology, but not floral characters. Although the relationship of this group to other taxa is unresolved in the individual molecular analyses, a combined analysis of all molecular data for a subset of the taxa reveals that the three taxa are more closely related to the Leucaena group than to Prosopis. We hypothesize that the unique floral characters of Mimozyganthus may have evolved in response to pollinator selection, and a pollination study is needed to test this hypothesis. © Copyright 2005 by the American Society of Plant Taxonomists.
format	JOUR
author	Luckow, M. Fortunato, R.H. Sede, S. Livshultz, T.
author_facet	Luckow, M. Fortunato, R.H. Sede, S. Livshultz, T.
author_sort	Luckow, M.
title	The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
title_short	The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
title_full	The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
title_fullStr	The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
title_full_unstemmed	The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
title_sort	phylogenetic affinities of two mysterious monotypic mimosoids from southern south america
url	http://hdl.handle.net/20.500.12110/paper_03636445_v30_n3_p585_Luckow
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The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America

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