Polyploidy variation in some species of the genus Artemisia L. ( Asteraceae) in Iran

摘要

Mitotic chromosome numbers are reported for thirty three populations representing four species of Artemisia. In A. incana, chromosome numbers were varied from 2n = 2x = 16, 18 to 2n = 3x =24. In A. fragrans eight diploid populations (2n =2x= 18) and three populations with both diploid and tetraploid chromosome number (2n = 2x = 18, 36) were identified. In A. scoparia six populations with chromosome number (2n = 2x = 16) and two populations with different chromosome number (2n = 2x = 16, 18) were found. The highest variation in chromosome number was observed in A. spicigera. In this species; different chromosome numbers (2n = 2x = 18, 2n =3x =27 , 2n= 4x = 36, 2n =5x = 45, 2n =6x = 54 and 2n =8x = 72) were identified in different populations that collected from different parts of Iran. Polyploidy is confirmed as the most significant evolutionary trend in chromosome number within the genus.