Study on the chromosome of cupressaceae, 8: Karyotype of Juniperus.
1991
Nagano K. | Nakamura M. | Toda Y.
The detailed karyotype analysis on 5 species of Juniperus and 4 varieties of J. chinensis was studied. A comparative karyological study among the species and the varieties through the observation of nucleoli using the Ag-I method was also conducted. The number of chromosomes of Juniperus was 2n=22, except for J. chinensis (2n=44) and its varieties (2n=44). Karyotype of Juniperus in all species observed consisted of satellite chromosome, metacentric chromosomes and submetacentric chromosome. The relative lengths of each chromosome in all species and varieties observed held no remarkable differences. And also their sizes decreased from large to small in a gradual manner. For these two reasons, this karyotype was classified as symetric and gradual. The number of satellite chromosomes of Juniperus coincided highly with the maximum number of nucleoli per cell. However, J. chinensis var. procumbens, which was tetraploid, had 4 nucleoli, one of which was very small, and it was found by the karyotype analsis that var. procumbens had only 3 observable satellite chromosomes.
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