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Giemsa C-banded Karyotypes of Two Subspecies of Hordeum brevisubulatum from China

Ib Linde-Laursen and Roland von Bothmer
Plant Systematics and Evolution
Vol. 145, No. 3/4 (1984), pp. 259-268
Published by: Springer
Stable URL: http://www.jstor.org/stable/23669992
Page Count: 10
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Giemsa C-banded Karyotypes of Two Subspecies of Hordeum brevisubulatum from China
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Abstract

C-banding patterns of H. brevisubulatum subsp. brevisubulatum (2x) and subsp. turkestanicum (4x) had conspicuous telomeric C-bands in at least one chromosome arm with a minor difference in average band size between subspecies. Other conspicuous bands were few in number as in other taxa of the species complex. The C-banded area of the chromosomes was estimated to be 7 to 8 and 6 per cent, respectively. C-banding- and SAT-chromosome polymorphisms were observed in both subspecies. The latter and previous observations indicate that the number of SAT-chromosomes is a less reliable diagnostic character. Nucleolar organizer region polymorphisms were demonstrated through silver nitrate staining of nucleoli. C-banding patterns corroborated that tetra- and hexaploid cytotypes of subsp. turkestanicum form an autopolyploid series. Reliable identification of H. brevisubulatum taxa based on cytological criteria should include the simultaneous use of C-banding patterns, and number and morphology of marker chromosomes.

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