Abstract Detail

Population Genetics/Genomics

Villalobos-Barrantes, Heidy M [1], Vergara-Meriño, Beatriz [1], Guerrero, Pablo C. [2].

Molecular systematics and genetic diversity in the Eriosyce curvispina complex (Cactaceae).

In the context of the biodiversity, is important to identify the priority areas for conservation. The taxonomy uncertainty in many of the plant groups within different areas can difficult this work because introducing a bias in the number of species.The Atacama Desert and Mediterranean Chile is an area where coexist some of the more conspicuous and endemic cactus species of the world.  For some of them the taxonomy is still unresolved completely.  That is the case of the Eriosyce curvispina complex (Bertero ex Colla). This complex is composed by five varieties and one subspecies: E. curvispina, E. curvispina var. aconcaguensis, E. curvispina var. choapensis, E. curvispina var. mutabilis, E. curvispina var. robusta and E. curvispina subsp. tuberisulcata, and belong to the genus Eriosyce, subgenus Horridocactus, tribe Notocactae. The last treatment, of the genus, was made by F. Ritter (1980) but only was viewed as a catalogue because it lacks a key to species.  This group as a whole has had a chequered taxonomic and nomenclatural history as Kattermann show in 1994.  The Eriosyce curvispina complex has a variety of colour flowers, but similar stem form and a restricted distribution in the central Chile (31 o -34 o S and 72 o – 70o W).  Their habitat is threatened mainly by human intervention, aridity and the loss of protect areas because the agriculture mainly, and in this way an effective conservation actions are needed but first is crusial to resolve completely the taxonomy. We used five different molecular markers, tree from plastid and two from the nucleus for the best assessement of the systematics using Mr.Bayes and Beast2.  In addition we used 12 polymorphic microsatellites to estimate the genetic diversity of 150 individual from the six different varieties as putative populations using GenAlEx 6.51b2, Structure 2.3.4 and R packages Pophelper and Adegenet.The phylogeny analysis show new relationships inside the Eriosyce genus and split the Eriosyce curvispina complex in two clades. The Molecular Variance indicated a 76% within populations, the mean Heterozygosity as 0,654 and mean of Polymorphic Loci as 95%.  Structure analysis show a most likely K = 6 and the DAPC analysis show a strong soport to this results and high structure of the populations.  Our results show a very high structuraction of the populations and give a great support to conclude that the their are a separete species and not belong to the complex anymore.

1 - Universidad de Concepción, Grupo Biomas , Doctorado en Sistemática y Biodiversidad, Facultad de Ciencias Naturales & Oceanográficas, Concepción, Bio Bio, 4070409, Chile
2 - Universidad de Concepción, Grupo Biomas , Departamento de Botánica, Facultad de Ciencias Naturales & Oceanográficas, Concepción, Bio Bio, 4070409, Chile

genetic diversity
population genetics

Presentation Type: Poster
Session: P, Population Genetics/Genomics Posters
Location: Virtual/Virtual
Date: Thursday, July 30th, 2020
Time: 5:00 PM Time and date to be determined
Number: PPG004
Abstract ID:421
Candidate for Awards:None

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