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Phylogeny, classification, and fruit evolution of the species-rich Neotropical bellflowers (Campanulaceae: Lobelioideae)

Artikel i vetenskaplig tidskrift
Författare L. P. Lagomarsino
Alexandre Antonelli
N. Muchhala
A. Timmermann
S. Mathews
C. C. Davis
Publicerad i American Journal of Botany
Volym 101
Nummer/häfte 12
Sidor 2097-2112
ISSN 0002-9122
Publiceringsår 2014
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 2097-2112
Språk en
Länkar dx.doi.org/10.3732/ajb.1400339
Ämnesord Andes, Burmeistera, Campanulaceae, Centropogon, fruit evolution, Lobelioideae, Neotropics, SECONDARY POLLEN PRESENTATION, BURMEISTERA CAMPANULACEAE, INFRAGENERIC, CLASSIFICATION, HISTORICAL BIOGEOGRAPHY, SUBFAMILY LOBELIOIDEAE, PLANT, DIVERSIFICATION, POLLINATION SYNDROMES, LIKELIHOOD APPROACH, CHROMOSOME-NUMBERS, ADAPTIVE RADIATION, Plant Sciences
Ämneskategorier Botanik

Sammanfattning

Premise of the study: The species-rich Neotropical genera Centropogon, Burmeistera, and Siphocampylus represent more than half of the similar to 1200 species in the subfamily Lobelioideae (Campanulaceae). They exhibit remarkable morphological variation in floral morphology and habit. Limited taxon sampling and phylogenetic resolution, however, obscures our understanding of relationships between and within these genera and underscores our uncertainty of the systematic value of fruit type as a major diagnostic character. Methods: We inferred a phylogeny from five plastid DNA regions (rpl32-trnL, ndhF-rpl32, rps16-trnK, trnG-trnG-trns, rbcL) using maximum-likelihood and Bayesian inference. Ancestral character reconstructions were applied to infer patterns of fruit evolution. Key results: Our results demonstrate that the majority of species in the genera Centropogon, Burmeistera, and Siphocampylus together form a primarily mainland Neotropical clade, collectively termed the "centropogonids." Caribbean Siphocampylus, however, group with other Caribbean lobelioid species. We find high support for the monophyly of Burmeistera and the polyphyly of Centropogon and mainland Siphocampylus. The ancestral fruit type of the centropogonids is a capsule; berries have evolved independently multiple times. Conclusions: Our plastid phylogeny greatly improves the phylogenetic resolution within Neotropical Lobelioideae and highlights the need for taxonomic revisions in the subfamily. Inference of ancestral character states identifies a dynamic pattern of fruit evolution within the centropogonids, emphasizing the difficulty of diagnosing broad taxonomic groups on the basis of fruit type. Finally, we identify that the centropogonids, Lysipomia, and Lobelia section Tupa form a Pan-Andean radiation with broad habitat diversity. This clade is a prime candidate for investigations of Neotropical biogeography and morphological evolution.

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