Genetic diversity and population structure ofHypericum humifusumL. (Hypericacae) in Tunisia: Implications for conservation

Autor:	Afef Béjaoui, Mohamed Boussaid, Chokri Messaoud, Mohamed Nejib Rejeb, Abdennacer Boulila
Rok vydání:	2010
Předmět:	Genetic diversity Habitat fragmentation biology Outbreeding depression Zoology Plant Science biology.organism_classification Gene flow Genetic distance Genetic structure Genetic variation Botany Hypericum humifusum Ecology Evolution Behavior and Systematics
Zdroj:	Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology. 144:592-601
ISSN:	1724-5575 1126-3504
DOI:	10.1080/11263504.2010.489325
Popis:	Sixteen Tunisian natural populations of Hypericum humifusum from different bioclimates (sub‐humid, upper semi‐arid and lower semi‐arid) were assessed for their genetic diversity using nine isozymes. For all populations and all enzymes, 11 polymorphic loci were detected. The allelic frequencies varied according to the populations. A high genetic diversity and an excess of heterozygosity were observed within populations (A p = 2.02; P% = 64.29; H o = 0.321). The outbreeding mating system and the high number of individuals in the starting populations may contribute to this high variation. A relatively high level of differentiation (F ST = 0.142) and a restricted gene flow among populations (N m =1.34) were revealed. The lower semi‐arid populations showed the highest differentiation (F ST = 0.205). The relationship between F ST and geographic distance matrices was not significant, indicating that the genetic structure among populations is more closely linked to habitat fragmentation and probably to f...
Databáze:	OpenAIRE
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