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Genetic diversity in two variants of Orobanche gracilis Sm. [var. gracilis and var. deludens (Beck) A. Pujadas] from different regions of Spain

The pattern of genetic variation among populations of two taxa of Orobanche gracilis Sm. [var. gracilis and var. deludens (Beck) A. Pujadas] from Northern and Southern Spain growing on different hosts was analysed using RAPD markers. The Dice's distance matrix was analyzed by UPGMA method and the resultant dendrogram clearly divided populations by region and botanical variety with the Southern populations being more differentiated among them in both cases (var. gracilis and var. deludens). Concerning O. gracilis var. deludens, the dendrogram has also shown host differentiation between populations growing on two different species, Ulex baeticus and Ulex parviflorus. A complementary analysis of principal coordinates (PCoA) confirmed these results. The analysis of molecular variance (AMOVA) indicated that the lowest level of differentiation was found among the Northern O. gracilis var. gracilis populations whereas in the case of O. gracilis var. deludens from the South most of the genetic diversity was attributable to differences among populations.

Orobache gracilis; population genetics; molecular markers; AMOVA

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