Table 3. A comparison of the karyotypic characteristics of S. oleracea L. Mazeran and S. tetrandra Stev. PI 647859.

Chromosome No.	Centromere Position	Relative Length (%)	Arm Ratioa	45Sb	5Sb	Satelliteb
S. oleracea L. Mazeran
1	Submedian	19.6	1.73
2	Submedian	18.2	2.17	S	L
3	Subterminal	17.3	3.44
4	Subterminal	16.0	3.36
5	Subterminal	14.5	3.11	S	L	S
6	Subterminal	14.4	6.61	S		S
Total length		100
S. tetrandra Stev. PI 647859
X	Median	18.1	1.29
Y	Median	29.9	1.12
1	Submedian	16.7	2.39		L
2	Submedian	16.6	2.84
3	Submedian	14.8	1.85
4	Submedian	17.9	1.86	S	L	S
5	Submedian	15.9	2.46	S		S
Total length (X)		100
Total length (Y)		111.8

Autosomes of S. tetrandra Stev. PI 647859 were ordered according to their similarity in the possession of rDNA loci (45S and 5S) to those of S. oleracea L. Mazeran.

^ar-index (long/short arm length ratio; Levan et al. 1964).

^bPositions of the rDNA loci (45S and 5S) and the satellites on the short (S) or long (L) arm.