Comparative karyomorphological studies in three species of Dracocepharum L. (Lamiaceae) in Altai Mountains, Russia and Mongolia

Abstract

Karyomorophology at the resting nuclei, mitotic prophase and metaphase chromosomes in three species of Dracocepharum were studied. They had commonly the resting nuclei of the complex chromocenter type, the mitotic prophase chromosomes of the proximal type, and the mitotic metaphase chromosomes had 2n=12 for D. peregrinum, 2n=10 for D. nutans and 2n=24 for D. origanoides. These chromosome numbers were verified with the previous reports. The karyotype formula of three species had 2n=12=8m+4sm for D. peregrinum, 2n=10=8m+2sm for D. nutans and 2n=24=14m+10sm for D. origanoides, and chromosome sizes for D. peregrinum is a little smaller one compare with D. nutans and D. origanoides.