Adil GÜNER, Vehbi ESER - optima
Adil GÜNER, Vehbi ESER - optima
Adil GÜNER, Vehbi ESER - optima
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Posters<br />
84<br />
FINE–SCALE GENETIC STRUCTURE OF CENTAUREA CINERARIA<br />
SUBSP. CINERARIA (ASTERACEAE) IN RELATION TO ITS<br />
FRAGMENTED HABITAT IN THE MEDITERRANEAN BASIN<br />
Carmine GUARINO 1 , Simona SANTORO 1 , Luciana DE SIMONE 1 , Guido CIPRIANI 2 ,<br />
Vincenzo LA VALVA 3<br />
1 Sannio University, Faculty of Sciences, Dept. of Biological and Environmental Sciences, Benevento, Italy<br />
guarino@unisannio.it<br />
2 Udine University, Faculty of Agricultural, Dept. of Crop Science and Agricultural Engineering, Udine, Italy<br />
guido.cipriani@uniud.it<br />
3 Naples University, Faculty of Sciences, Dept. of Biological Sciences, Section of Vegetal Biology, Naples, Italy<br />
vincenzo.lavalva@unina.it<br />
Centaurea cineraria L. subsp. cineraria (Asteraceae) is an endemic, sea-cliff-dwelling plant<br />
from southern Italy that reproduces sexually by cross-pollination. However, individuals of C.<br />
cineraria subsp. cineraria are spatially subdivided into two subpopulations located,<br />
respectively, on the island and continental parts of the cliff, and separated from the sea.<br />
Genetic diversity and population structure have been investigated through the analysis of<br />
neutral hypervariable markers such as simple sequence repeats (SSRs) to unravel the impact<br />
of habitat fragmentation of this species habitat that could have led to present genetic<br />
differentiation between the populations.<br />
We found that the genetic diversity was considerable (average He = 0.496-0.863), together<br />
with a low differentiation among populations, as estimated by FST = 0.229 and a high<br />
inbreeding level (FIS= 0.449). Bayesian analysis suggests that the current populations of C.<br />
cineraria subsp. cineraria are structured into two gene pools.<br />
SSR data indicated significant deviation from random dispersal of genes and genotypes<br />
between the two groups, suggesting that mating occurs mainly among individuals within<br />
subpopulations, thus, favouring the divergence between the two groups. This<br />
microevolutionary differentiation scenario might have been caused by a coupled effect of past<br />
genetic drift and reproductive system, as a result of the geological activity in the<br />
Mediterranean.<br />
The identification of such genetic structure in this narrow endemic prompts a management<br />
strategies of its single extant population.<br />
Keywords Centaurea cineraria subsp. cineraria; microsatellites; habitat fragmentation; plant<br />
genetic diversity.<br />
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