Zamia angustifolia, Z. integrifolia, Z. pumila and
Z. pygmaea had the common chromosome number of 2n= 16 and the common karyotype which consisted of 12 median-, 2 submedianand 2 subterminal-centromeric chromosomes. The 4 species showed commonly the CMA-positive band in the centromeric region of 2 median-, 2 submedian-and 2 subterminal-centromeric chromosomes. In contrast,
Z. furfuracea, Z. loddigesii, Z. skinneri and
Z. vazquezii had commonly the chromosome number of 2n=18 and 10 median-and 2 submedian-centromeric chromosomes in karyotype but exhibited 6 different chromosomes from each other.
Zamia furfuracea and
Z. loddigesii displayed the CMA-positive band in the centromeric region of 8 median-and 6 acro-centromeric chromosomes.
Zamia skinneri performed the CMA-positive band in the centromeric region of 4 acro-and 2 terminal-centromeric chromosomes, while
Z. vazquezii performed the CMA-positive band in the centromeric region of 4 median-and 6 terminal-centromeric chromosomes.
Zamia muricata had the chromosome number of 2n=23 differed from that of the previous count, the karyotype which consisted of 7 median-and 16 acro-centromeric chromosomes and the CMA-positive band in the centromeric region of 4 median-and 16 acro-centromeric chromosomes. Then, the 9 species of
Zamia studied exhibited unclear DAPI-positive bands near the centromeric region of most of their chromosomes. By comparison, the closely related
Ceratozamia mexicana had the chromosome number of 2n=16 and the CMA-positive band at the terminal region of 6 chromosomes.
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