Karyotypes of Adonis amurensis (Ranunculaceae) in the Primorsky Territory and in Sakhalin

The karyotypes of Adonis amurensis Regel et Radde from the Primorye Territory and Sakhalin were studied. Comparison of karyotypes was carried out by the absolute and relative length of the chromosomes and the centromere index. The both samples showed 2n = 2x = 16, the chromosomes of Adonis amurensis are quite large and clearly morphologically differentiated. The method of maximal similarity of homologues was used to identify chromosomes. The results of morphometric analysis and idiograms are presented. Karyotypes are uniform in type of chromosomes. According to the degree of asymmetry, 4 pairs of metacentric and submetacentric chromosomes were identified. The chromosomes of samples from the Primorye Territory are larger than those from Sakhalin. The average total length of the haploid set of samples from Primorye Territory was 68.35 μm; from Sakhalin it was 61.49 μm. Karyotypes have satellites on short shoulders. Each satellite has its own specific shape, size and length of the thread. A distinctive feature of karyotypes of continental and insular plants is the number of satellites in the samples. Karyotypes are characterized by polymorphism in size and morphology of satellite regions of chromosomes. The variations in morphometric parameters are quite stable. The karyotypes show differences plant from Sakhalin Island and Primorye Territory.