Karyotypes,C-banding and nucleolar numbers inGuizotia (Compositae) |
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Authors: | Kifle Dagne |
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Institution: | (1) Department of Plant Breeding Research, The Swedish University of Agricultural Sciences, S-268 31 Svalöv, Sweden;(2) Present address: Department of Biology, Faculty of Science, Addis Ababa University, P.O. Box 1176, Addis Ababa, Ethiopia |
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Abstract: | Karyotypes, constitutive heterochromatin and nucleolar numbers of five recognized taxa and two systematically new populations ofGuizotia have been studied using Giemsa or aceto-orcein staining, C-banding and silver nitrate staining. All accessions have 2n = 30 chromosomes, but satellite chromosome number and nucleolar number varied from four to eight. Centromere positions varied from predominantly median to submedian and subterminal in different materials. The satellites and an interstitial region in the short arm of one chromosome pair were C-banded in all materials. Telomeric and centromeric C-bands were also observed. The material could be classified into three groups, indicating possible phylogenetic relationships. |
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Keywords: | Compositae Guizotia arborescens G scabra subsp scabra G scabra subsp schimperi G villosa G zavattarii Karyotype satellite chromosomes nucleolar number C-banding silver nitrate staining phylogenetic relationships |
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