Abstract
Nectouxia (Solanaceae) is a monospecific genus endemic to Mexico and southern United States of America. Morphological and phylogenetic evidence supports a close relationship between Nectouxia and the Andean genus Salpichroa, but the phylogenetic analyses completed to date have included very few Salpichroa species. A comprehensive phylogenetic analysis including Nectouxia and all Salpichroa species was carried out to shed light on the relationship between the two genera. Maximum parsimony and Bayesian inference analyses were done using sequences from three markers (ITS, psbA-trnH, and ndhF-rpL32). The results of both analyses are congruent regarding the strongly supported clades while incongruences are observed in weakly supported clades that can be explained by rapid species radiation. Salpichroa species are divided in two main clades with strong support, while Nectouxia is resolved within one of them. Our results indicate that the two genera should be combined into a single genus or Salpichroa will be paraphyletic as currently circumscribed. The name Nectouxia has priority but the conservation of Salpichroa has been proposed. At the suprageneric level, the Nectouxia + Salpichroa clade is not closely related to Jaborosa, which is further evidence that the previously recognized tribe Jaboroseae is not monophyletic.
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Acknowledgements
We are indebted to G. Salazar Chávez (Instituto de Biología, UNAM, Mexico) and F. Chiarini (IMBIV, Argentina) for providing photographs of Nectouxia formosa. We thank the governments of Argentina, Bolivia, Ecuador, and Peru for the permits to do field trips and plant collections. This research was financially supported by grants awarded to G. Barboza and S. Leiva González by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina), Ministerio de Ciencia, Tecnología e Innovación Productiva (MINCYT, Argentina), Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT, Argentina), Consejo Nacional de Ciencia, Tecnología e Innovación Tecnológica (CONCYTEC, Peru), and Secretaria de Ciencia y Tecnología (SECyT-UNC, Argentina).
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Online Resource 1. Table of materials studied and GenBank accession numbers.
Online Resource 2. Alignment of concatenated psbA-trnH, ndhF-rpl32, and ITS sequences in nexus format.
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Carrizo García, C., Basso, A.V., Leiva González, S. et al. Unraveling the phylogenetic relationships of Nectouxia (Solanaceae): its position relative to Salpichroa . Plant Syst Evol 304, 177–183 (2018). https://doi.org/10.1007/s00606-017-1460-5
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DOI: https://doi.org/10.1007/s00606-017-1460-5