Chromosome numbers in Hieracium and Pilosella species (Asteraceae) from the Iberian Peninsula and the Balearic Islands

Abstract

Mitotic chromosome numbers are reported from 16 Hieracium and two Pilosella species from the Iberian Peninsula and the Balearic Islands that are little known cytogenetically. The chromosome numbers of Hieracium aragonense Scheele (2 n = 27, 36), H. compositum Lapeyr. (2 n = 27), H. murcandidum G. Mateo (2 n = 27), H. spathulatum Scheele (2 n = 27), H. segurae Mateo (2 n = 27), H. teruelanum Mateo (2 n = 27), H. valentinum Pau (2 n = 27), Pilosella pseudovahlii (De Retz) Mateo (2 n = 18), and P. tardans (Peter) Sójak (2 n = 36) were determined for the first time. New cytotypes were detected in H. cordifolium Lapeyr. (2 n = 27) and H. loscosianum Scheele (2 n = 36). The karyotype of the studied species was similar in overall morphology and comprised metacentric and submetacentric chromosomes; secondary constrictions (up to two) were detected in the chromosome complements of some species.

Chromosome Numbers in Hieracium (Asteraceae) from Central and Southeastern Europe III

“…1g). This is the first chromosome number for the species from Poland which confirms the previously published counts from Spain (Castro et al, 2007).…”

Geographical parthenogenesis, genome size variation and pollen production in the arctic-alpine species Hieracium alpinum

“…The great majority of karyologically analysed taxa are either tri-or tetraploid, reproduce asexually and occupy a large holarctic range (Gustafsson 1946;Schuhwerk 1996). Conversely, sexual diploid taxa are rare and mostly confined to restricted ranges in southern parts of Europe (Merxmüller 1975;Vladimirov 2000;Castro et al 2007;Chrtek et al 2007). In Hieracium s.str., species typically contain only one ploidy level.…”

Chromosome Numbers in Hieracium (Asteraceae) from Central and Southeastern Europe II

“…Triploids have been reported from the Pyrenees (Castro et al, 2007;Chrtek et al, 2007), Sudetes, Western Carpathians (Chrtek, 1996;Májovský et al, 1974) and Caucasus (Nazarova, 1984). This is the first chromosome number report for this species from Poland.…”