Four taxa of Japanese Agrimonia were studied cytologically. Chromosome numbers were: n=14, 2n=28 for A. coreana and A. nipponica; n=28, 2n=56 for A. pilosa var. japonica; and 2n=42 for A.×nippono-pilosa. The karyotypes of the four taxa were gradual and symmetric, and are expressed as follows: A. coreana: 2n=28=12m+4tm+12sm; A. nipponica: 2n=28=16m+2tm+6sm+2tsm+2st;A. pilosa var. japonica: 2n=56=42m+12sm+2tsm;A.×nippono-pilosa: 2n=42=29m+1tm+9sm+2tsm+1st. The karyotype formula of A.×nippono-pilosa corresponded with half a set of A. nipponica (8m+1tm+3sm+1tsm+1st) and half of A. pilosa var. japonica (21m+6sm+1tsm). Thus, this plant is thought to be F1 hybrid between A. nipponica and A. pilosa var. japonica. In the PMCs of this proposed hybrid, the most frequent kind of chromosome pairing was 14II+14I, which suggests that A. pilosa var. japonica is an allopolyploid which includes the same genome as that of A. nipponica.
All Science Journal Classification (ASJC) codes
- Animal Science and Zoology
- Plant Science
- Cell Biology