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Karyology and Phylogeny of Some Mesoamerican Species of Zamia (Zamiaceae)

Paolo Caputo, Salvatore Cozzolino, Lucinao Gaudio, Aldo Moretti and Dennis W. Stevenson
American Journal of Botany
Vol. 83, No. 11 (Nov., 1996), pp. 1513-1520
Stable URL: http://www.jstor.org/stable/2446105
Page Count: 8
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Karyology and Phylogeny of Some Mesoamerican Species of Zamia (Zamiaceae)
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Abstract

Chromosome numbers and karyotypes of four species of Zamia L (Zamiaceae) are described Plants of Z manicata from Colombia are 2n = 18 with eight metacentric (M), four submetacentric (S), two acrocentric (A), and four telocentric (T) chromosomes Plants of Z ipetiensis from Panama are 2n = 23 with 3M + 4S + 2A + 14T Plants of Z cunaria from Panama have two different chromosome numbers, 2n = 23 with 3M + 4S + 2A + 14T and 2n = 24 with 2M + 4S + 2A + 16T Plants of Z acuminata from Costa Rica and Panama are 2n = 24 with 2M + 4S + 2A + 16T On the basis of the occurrence of a one-to-two-ratio in the variation of M- and T-chromosome numbers in the karyotypes, centric fission or fusion are considered for their potential involvement in the chromosome variation of these plants Data deriving from morphology and karyology, interpreted in a cladistic framework, suggest that centric fission rather than centric fusion is involved in the karyotype diversification of the four species and their closest Mesoamerican allies.

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