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Abstract:

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.

Registro:

Documento: Artículo
Título:The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America
Autor:Luckow, M.; Fortunato, R.H.; Sede, S.; Livshultz, T.
Filiación:L. H. Bailey Hortorium, 228 Plant Sciences, Cornell University, Ithaca, NY 14853, United States
Consejo Nacional de Investigaciones Científicas Y Técnicas (CONICET), Instituto de Recursos Biológicos, I.N.T.A., Castelar 1712, Buenos Aires, Argentina
Laboratorio de Citogenética y Evolución, Departamento de Ecología, Genética y Evolución, Pabellón II, C1428EHA, Buenos Aires, Argentina
Palabras clave:Caesalpinioideae; Leucaena; Mimosoideae; Prosopidastrum; Prosopis
Año:2005
Volumen:30
Número:3
Página de inicio:585
Página de fin:602
DOI: http://dx.doi.org/10.1600/0363644054782206
Título revista:Systematic Botany
Título revista abreviado:Syst. Bot.
ISSN:03636445
CODEN:SYBOD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03636445_v30_n3_p585_Luckow

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Citas:

---------- APA ----------
Luckow, M., Fortunato, R.H., Sede, S. & Livshultz, T. (2005) . The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America. Systematic Botany, 30(3), 585-602.
http://dx.doi.org/10.1600/0363644054782206
---------- CHICAGO ----------
Luckow, M., Fortunato, R.H., Sede, S., Livshultz, T. "The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America" . Systematic Botany 30, no. 3 (2005) : 585-602.
http://dx.doi.org/10.1600/0363644054782206
---------- MLA ----------
Luckow, M., Fortunato, R.H., Sede, S., Livshultz, T. "The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America" . Systematic Botany, vol. 30, no. 3, 2005, pp. 585-602.
http://dx.doi.org/10.1600/0363644054782206
---------- VANCOUVER ----------
Luckow, M., Fortunato, R.H., Sede, S., Livshultz, T. The phylogenetic affinities of two mysterious monotypic mimosoids from southern South America. Syst. Bot. 2005;30(3):585-602.
http://dx.doi.org/10.1600/0363644054782206