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Forests 2017, 8(5), 143; doi:10.3390/f8050143

Genetic Diversity in Relict and Fragmented Populations of Ulmus glabra Hudson in the Central System of the Iberian Peninsula

1
Departamento de Biotecnología-Biología Vegetal, Escuela Técnica Superior de Ingeniería Agronómica, Alimentaria y de Biosistemas, Universidad Politécnica de Madrid, Avda. Puerta de Hierro 2-4, 28040 Madrid, Spain
2
Departamento de Sistemas y Recursos Naturales, Escuela Técnica Superior de Ingeniería de Montes, Forestal y del Medio Natural, Universidad Politécnica de Madrid, Paseo de las Moreras s/n, 28040 Madrid, Spain
3
Department of Botany, Gargi College, University of Delhi, Sirifort Road, New Delhi 110049, India
*
Author to whom correspondence should be addressed.
Academic Editor: Timothy A. Martin
Received: 16 February 2017 / Revised: 19 April 2017 / Accepted: 20 April 2017 / Published: 27 April 2017
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Abstract

Ulmus glabra Hudson, or Wych elm, occurs as fragmented and relict natural populations in the Central System, which acts as a refugium in the Iberian Peninsula. Considering the importance of the Central System populations of U. glabra, the main objective was to assess their genetic diversity using nuclear microsatellite markers. A total of 360 different genotypes were detected in the 427 U. glabra individuals analyzed. Wych elm populations showed a highly significant genetic differentiation (24%; p = 0.0001). Of the 22 populations studied, population of Rozas de Puerto Real (ROZ) showed the highest values of effective number of alleles (2.803), mean Shannon’s diversity (1.047) and expected heterozygosity (0.590). Populations of ROZ and Mombeltrán (MOM) showed the highest values of observed heterozygosity (0.838 and 0.709, respectively), and highly negative values for inbreeding coefficient (−0.412 and −0.575, respectively). Also, most of putative hybrids (50 of 55) were observed in these two populations. Demographic analysis revealed signals for recent (four populations) and ancestral (fifteen populations) bottlenecks. Fragmented populations with diminishing number of individuals, along with anthropogenic intervention and Dutch elm disease (DED), are the main threats to U. glabra populations. From a future perspective, the information generated can be considered in the formulation of conservation strategies for U. glabra populations in the Central System. View Full-Text
Keywords: fragmented populations; genetic diversity; introgression; microsatellite markers; population bottleneck; Ulmus glabra; Wych elm fragmented populations; genetic diversity; introgression; microsatellite markers; population bottleneck; Ulmus glabra; Wych elm
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Martín del Puerto, M.; Martínez García, F.; Mohanty, A.; Martín, J.P. Genetic Diversity in Relict and Fragmented Populations of Ulmus glabra Hudson in the Central System of the Iberian Peninsula. Forests 2017, 8, 143.

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