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KMID : 0368420040470040322
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Journal of Plant Biology
2004 Volume.47 No. 4 p.322 ~ p.329
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Geographical distribution of cytotypes and genomic structures in natural populations of theScilla scilloides complex in Korea
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Choi Hae-Woon
Lee Woo-Kyu
Choi Eun-Young
Park Jae-Hyun
Bang Jae-Wook
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Abstract
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Cytotype distribution, B-chromosome frequency, and genomic constitution in the natural populations of theScilla scilloides complex in Korea were analyzed. Plants with various cytotypes were found: AA (2n = 16), BB (18), AAB (25), ABB (26), ABB (34), ABBB (35), BBBB (36), AABBB (43), AAABBB (51) and AAAABBBB (68). Allotetraploid AABB plants predominated with a frequency of 68.3%, and were found to distribute all over the Korean peninsula and Cheju-do. In diploids, the type AA plants distributed throughout the Korean midwest, while the type BB plants were limited to Cheju-do. Two other cytotypes, ABBB and AABBB, were found only in the southern part of the Korean peninsula including Cheju-do. Chromosomal variations, aneuploidy, and centromeric shifts were also found in the natural populations. The cytotypes AAB and AAAABBBB are reported here for the first time. B-chromosomes were found in 149 (85.6%) of 174 populations, the highest frequency being 81.8% in BB populations. The number of B-chromosomes per plant ranged from 1 to 31, and IB plants predominated (21.0%). Subtypes, with respect to the number and composition of B-chromosomes, indicated that sexual reproduction is still prevalent in AABB populations.
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KEYWORD
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autosome, B-chromosome, cytotype, genome, Scilla scilloides, subtype
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