Chromosome patterns and nuclear phenomena in the cycad families Stangeriaceae and Zamiaceae

Marchant, C. J.

doi:10.1007/bf00329609

Cited by 56 publications

(42 citation statements)

References 24 publications

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“…Even on same slide of each of the 4 species, sizes of the heterochromatic short arms of the tchromosomes varied among the nucleus plates studied. These heterochromatic short arms had been observed on t-chromosome by Marchant (1968) and Moretti (1990b). Then, these arms had not been well-studied and concerned for karyotype analysis.…”

Section: Resultsmentioning

confidence: 70%

“…Zamia has been well studied in diversity of chromosome numbers from 2n=16 to 28 due to interspecific (Marchant 1968, Vovides 1983, Moretti 1990a, b, Moretti et al . 1991, Caputo et al 1996 and intraspecific aneuploids (Norstog 1980, Moretti and Sabato 1984, Moretti et al 1991, Vovides and Olivares 1996.…”

mentioning

confidence: 99%

“…1991, Caputo et al 1996 and intraspecific aneuploids (Norstog 1980, Moretti and Sabato 1984, Moretti et al 1991, Vovides and Olivares 1996. This aneuploid series might be promoted by the centric fusion (Marchant 1968, Norstog 1980 or centric fission (Moretti and Sabato 1984, Moretti 1990a, b, Moretti et al 1991.…”

mentioning

confidence: 99%

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A Karyotype Comparison of Nine Species of Aneuploid Zamia by Using the Conventional Orcein Staining and the Fluorochrome CMA-DAPI Differential Staining Methods.

Tagashira

Kondo

1999

CYTOLOGIA

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Summary 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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Section: Resultsmentioning

confidence: 70%

mentioning

confidence: 99%

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A Karyotype Comparison of Nine Species of Aneuploid Zamia by Using the Conventional Orcein Staining and the Fluorochrome CMA-DAPI Differential Staining Methods.

Tagashira

Kondo

1999

CYTOLOGIA

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“…This is evident from the examples of Stangeria paradoxa (MARCHANT 1968) with a few telocentric chromosomes and Podocarpus nivalis (HAIR and BEUZENBERG 1958) having majority of the chromosomes with terminal centromeres. In Welwitschia mirabilis (KHOSHOO and AHUJA 1963) and Tradescantia micrantha (JoNES and CoLDEN 1968) the whole individual complements are beset with telocentric chromosomes.…”

Section: Discussionmentioning

confidence: 94%

Telocentric Chromosomes and Karyotypes in the GenusBlepharis

Ranganath

Krishnappa

1982

Caryologia

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“…The occurrence of a diversity of karyotypes in a geographically restricted collection of individuals of one species is unique among cycads; no other example is known (see NoRSTOG 1980b). Among cycads other than Zamia, chromosome numbers are remarkably uniform (MARCHANT 1968 (Lepidozamia, Ceratozamia, Bowenia), or their cytology has not been well studied (Cycas, Dioon).…”

Section: Discussionmentioning

confidence: 99%

Karyotypes ofZamia Chigua(Cycadales)

Norstog

1981

Caryologia

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SUMMARY -Zamia chigua, an arborescent cycad of the Pacific coast of Colombia, South America, has been found to have chromosome numbers of 2n = 22, 24, 25 and 26. Specimens collected from two adjacent populations displayed this range of numbers with karyotypes differing principally in the numbers of telocentric and metacentric chromosomes present in each; 2n = 22, 24, 25, 26 plants were found to have 4, 2, 1 and 0 metacentrics and 12, 16, 18, and 20 telocentric chromosomes, respectively. Because all plants examined in the field demonstrated high fertility, it is inferred that meiosis and fertilization are essentially normal despite differences in chromosome numbers. Zamia chigua, on the basis of morphological and ecological characteristics, is considered to be a primitive member of its genus, and it is thought that chromosome and karyotype evolution in Zamia has occurred by fusion of telocentric chromosomes, producing lower-numbered, symmetrical karyotypes found in apparently more specialized members of the genus.

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Chromosome patterns and nuclear phenomena in the cycad families Stangeriaceae and Zamiaceae

Cited by 56 publications

References 24 publications

A Karyotype Comparison of Nine Species of Aneuploid Zamia by Using the Conventional Orcein Staining and the Fluorochrome CMA-DAPI Differential Staining Methods.

A Karyotype Comparison of Nine Species of Aneuploid Zamia by Using the Conventional Orcein Staining and the Fluorochrome CMA-DAPI Differential Staining Methods.

Telocentric Chromosomes and Karyotypes in the GenusBlepharis

Karyotypes ofZamia Chigua(Cycadales)

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