Giemsa C-banded karyotypes of eight species of Alstroemeria L. and some of their hybrids
1996
Buitendijk, J.H. | Ramanna, M.S.
Karyotype analysis of Alstroemeria angustifolia ssp. angustifolia, A. aurea, A. inodora, A. ligtu spp. ligtu, A. magnifica ssp. magnifica, A. philippii and A. psittacina using Feulgen-staining and Giemsa C-banding techniques revealed for each species a characteristic chromosome morphology and C-banding pattern. These characteristics could he used to identify many individual chromosomes in diploid interspecific hybrids. Besides interspecific variation, sonic degree of intraspecific variation in C-banding pattern was observed within A. angustifolia ssp. angustifolia, A. aurea, A. ligtu ssp. ligtu, A. magnifica ssp. magnifica and A. Philippii. All species had large chromosomes (2n = 2x = 16) and asymmetric karyotypes. In many species the short arms of the acrocentric chromosomes were darkly stained upon Giemsa C-banding. These telomeric bands seemed satellites. B-chromosomes were observed in one species, A. angostifolia ssp. angustifolia. A variable number of large intercalary and telomeric C-bands was present in the Chilean species, whereas the Brazilian species showed only small C-bands. The differences in karyotypes suggest an early separation of the Chilean and Brazilian species, after which speciation followed different evolutionary pathways. In Alstroemeria the Giemsa C-banding technique can be valuable to plant taxonomists for unravelling species relationships.
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