2016 Volume 81 Issue 3 Pages 279-283
Several bulbs of Scilla scilloides collected at two localities in Northern Taiwan were studied for their karyotypes. All plants had 2n=34 chromosomes and their karyotypes, including the characteristic chromosomes of A and B genomes, were considered to be AABB genome constitution. The karyotype of each plant had two, three or four secondary constricted chromosomes. In all plants, two chromosomes with clear secondary constriction having an elongated thread and satellite corresponded to the b1 chromosome of the B genome. In some plants, two or one a2 chromosomes of the A genome had secondary constriction at the proximal region in addition to the b1 chromosome. All plants formed, at maximum, four nucleoli with various sizes in a nucleus, indicating that they had four NORs in contrast with the number of secondary constrictions. Size variation of nucleoli seemed to correlate with incidence of secondary constriction. The variation of secondary constriction or NOR in AABB plants of Taiwan populations was discussed with AABB karyotypes in other localities.