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A comparative karyomorphological analysis was performed on Actaea acuminata, A. asiatica, and A. erythrocarpa. The karyotype of A. acuminata was re-examind; its formula proved to be 2n = 16 = 10m + 2sm + 2st + 2t. This species' karyotype was found to differ from that of A. spicata (2n = 16 = 10m + 4sm + 2t), thus allowing us to propose a species st...
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Context 1
... the studied specimens were found to be diploid with 2n = 16 (Figures 2 and 3). Their chromosome sets contain five pairs of large metacentric chromosomes, gradually decreasing in length, and three pairs of shorter unequalarmed chromosomes ( Table 2). Values of the parameters characterizing levels of intrachromosomal asymmetry (mean centromeric asymmetry) and interchromosomal asymmetry (the coefficient of variation of chromosome length) proved to be similar among all the studied specimens (Table 3). ...Context 2
... sixth (by length) pair of chromosomes is subtelocentric, and the seventh one is submetacentric, having relative lengths of 5.59% and 4.62%, respectively, on average. The eighth pair is represented by telocentric chromosomes with a poorly distinguishable short arm; its relative length is on average 4.06% (Figure 2A and 3; Table 2). ...Context 3
... have similar arm ratios but are clearly distinguishable by length; their relative lengths are 5.60% and 4.59%, respectively, on average. The shortest pair of chromosomes is telocentric having a relative length of 4.33% on average; its short arm is almost indistinguishable (Figure 2B and 3; Table 2). ...Context 4
... parameters were found to be similar among the studied A. erythrocarpa specimens from different regions ( Figure 2C-F and 3; Table 2). Five pairs of large metacentric chromosomes vary in relative length on average from 5.94% to 8.17% and in the arm ratio on average from 1.06 to 1.32. ...