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Genome size variation and polyploidy in the geographical range of Juniperus sabina L. (Cupressaceae)

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Farhat, Perla | Siljak-Yakovlev, Sonja | Adams, Robert | Bou Dagher Kharrat, Magda | Robert, Thierry

Edité par CCSD ; Taylor & Francis -

International audience. Polyploidy and natural hybridization are considered as two major evolutionary processesinvolved in plant speciation and diversification. In conifers, natural hybridization has beennoticed to be more frequent than polyploidy. Nevertheless, a few cases of polyploidy havebeen reported in the genus Juniperus. In this genus, a new variety Juniperus sabina var.balkanensis has been postulated to have arisen from an ancient hybridization between thetetraploid species Juniperus thurifera and the diploid species Juniperus sabina var. sabina. Thegenome size variation and the ploidy level of two J. sabina taxa were estimated by flowcytometry in a panel of 29 populations. All 13 populations of J. sabina var. sabina werediploid, with genome sizes ranging from 22.09 to 25.03 pg/2C, while the 16 populations ofJ. sabina var. balkanensis were tetraploid, with genome sizes ranging from 41.99 pg to 51.33pg/2C. These findings open new venues towards the discovering of the polyploidizationpathway of J. sabina var. balkanensis and to understand historical and ecological factors thatexplain its current geographical distribution.

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