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Plant Systematics and Evolution

, Volume 301, Issue 4, pp 1215–1226 | Cite as

Systematic implications of seed morphological diversity in Portulacaceae (Caryophyllales)

  • Gilberto OcampoEmail author
Original Article

Abstract

The Portulacaceae are a monogeneric family with around 100 species distributed around the world. Seed morphology in the group is diverse, but its systematic significance is controversial, and its diversification patterns are unknown. In this study, the seed morphology and size of 63 samples representing 49 species, nine varieties, and two cultivars are evaluated under a phylogenetic framework. Eight seed features (including size) and DNA sequences were analyzed with parsimony and Bayesian methods and seed diversification patterns were estimated using ancestral character reconstruction under a parsimony approach. Analyses of the seed features retrieved an unresolved phylogeny, contrary to the phylogenetic estimate of the DNA data that was consistent with the clades and subclades obtained in previous studies. The analyses of a combined data matrix of seed features and DNA sequence data did not improve nodal support for the relationships within Portulacaceae. Although the hypothesis testing procedures could not reject the monophyly of major clades within Portulacaceae, ancestral character reconstruction analyses showed that the seed features are homoplasious and do not represent synapomorphies for those clades. Some character states were predominantly present in one clade and were rarely found in others. Seed size seemed to be relatively constant throughout the evolutionary history of Portulacaceae (<0.85 mm long), with multiple independent events of size increase. Although seed features do not reflect the evolutionary history of Portulacaceae, they still have a high taxonomic value, especially when used along with other features.

Keywords

Character evolution Portulaca Portulacaceae Seed morphology Systematics 

Notes

Acknowledgments

I am grateful to James André, Hari Chhetri, J. Travis Columbus, Jennifer Cruse-Sanders, Patricia Jaramillo, James Matthews, Alfredo Reyes-Betancort, and Megan Thomas for providing samples for this study; Priscila Burgoyne at the Pretoria National Herbarium, Héctor Osorio at the Museo Nacional de Historia Natural (Uruguay), Bryan Simon at the Queensland Herbarium, Fernando Zuloaga at the Instituto de Botánica Darwinion, the Missouri Botanical Garden, and the University of Arizona Herbarium for access to herbarium collections; James André, J. Travis Columbus, Stephen Dreher, Amanda Ingram, Tasha LaDoux, Oscar Morales, Sarah Siedschlag, and Valerie Sosa for their companionship and assistance during fieldwork. This study was supported by Rancho Santa Ana Botanic Garden, the Cactus and Succulent Society of America, Claremont Graduate University, the Claremont University Club, and The Community Foundation serving the Riverside and San Bernardino Counties. Financial support to the author was provided by Rancho Santa Ana Botanic Garden, The Fletcher Jones Foundation, Comisión Nacional de Ciencia y Tecnología (Mexico), Fundación Prywer (Mexico), and the Instituto de Ecología, A.C. (Mexico).

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Copyright information

© Springer-Verlag Wien 2014

Authors and Affiliations

  1. 1.Rancho Santa Ana Botanic Garden and Claremont Graduate UniversityClaremontUSA
  2. 2.Department of Botany, Institute for Biodiversity Science and SustainabilityCalifornia Academy of SciencesSan FranciscoUSA

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