Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/6376
Título: Low genetic diversity and significant structuring in the endangered Mentha cervina populations and its implications for conservation
Autor: Rodrigues, Leandra
Berg, Cássio Van den
Póvoa, Orlanda
Monteiro, Ana
Palavras-chave: Mentha cervina
genetic diversity
population structure
conservation genetics
endemic species
Data: 2013
Editora: Elsevier
Citação: "Biochemical Systematics and Ecology". ISSN 0305-1978. 50 (2013) 51-61
Resumo: Eighteen populations of the endangered aromatic and medicinal plant Mentha cervina (Lamiaceae) were sampled across its natural range, in the western half of the Iberian Peninsula, and inter-simple sequence repeats (ISSRs) markers were used to assess genetic diversity and population structure. M. cervina populations exhibited a relatively low genetic diversity (percentage of polymorphic loci PPB ¼ 14.2–58.3%, Nei’s genetic diversity He ¼ 0.135–0.205, Shannon’s information index I ¼ 0.08 0.33). However, the genetic diversity at species level was relatively high (PPB ¼ 98.3%; He ¼ 0.325; I ¼ 0.23). The results of the analysis of molecular variance indicated very structured populations, with 50% of the variance within populations, 44% among populations and 6% between regions defined by hydrographic basins, in line with the gene differentiation coefficient (GST ¼ 0.532). A Mantel test did not find significant correlation between genetic and geographic distance matrices (r ¼ 0.064), indicating that isolation by distance is not shaping the present genetic structure. The levels and patterns of genetic diversity in M. cervina populations were assumed to result largely from a combination of evolutionary history and its unique biological traits, such as breeding system, low capacity of dispersion, small effective size and habitat fragmentation. The high genetic differentiation among populations indicates the necessity of conserving the maximum possible number of populations. The results also provide information to select sites for ex situ conservation. Optimal harvesting strategies, cultivation and tissue culture should also be developed as soon as possible to guarantee sustainable use of the species under study.
Peer review: yes
URI: http://hdl.handle.net/10400.5/6376
ISSN: 0305-1978
Versão do Editor: www.elsevier.com/locate/biochemsyseco
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