Karyotype Investigations in Iranian Scorzonera tortuosissima and S. intricata, Asteraceae

抄録

Somatic chromosomes of two Scorzonera species from subgenus Scorzonera, section Intricatae collected from four localities in southeast Iran were observed. In S. tortuosissima, 2n=28 was observed. S. intricata revealed two chromosome numbers of 2n=20 and 21. The chromosome numbers of 2n=21 had one B chromosome then the basic number is x=10 which is a new basic chromosome number for Scorzonera. Both species showed a predominance of metacentric chromosomes in each karyotype. The karyotype was formulated as 12m+2sm for S. tortuosissima and 8m+2sm for S. intricata.