Chromosome Botany
Online ISSN : 1881-8285
Print ISSN : 1881-5936
ISSN-L : 1881-5936
A comparative study of karyotypes in two species of Byblis (Byblidaceae)
Yoshikazu HoshiKenji FukushimaKatsuya Nagano
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2007 Volume 2 Issue 1 Pages 39-43

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Abstract

Byblis filifolia and B. liniflora had the diploidal and the tetraploidal chromosome numbers of 2n=16 and 32, respectively. In condensation behavior from prophase to metaphase, most chromosomes of both species had early condensing segments at the proximal regions. At prometaphase and early-metaphase, all chromosomes except for some small sized chromosomes had decondense segments at the distal regions in both arms. At mid-metaphase, well-spread chromosomes were quite rare to obtain, because all chromosomes at mid-metaphase stage were quite sticky nature, but not earlier stages of metaphase and prophase. The metaphase chromosomes in both species showed a gradual decrease in size from the largest to the smallest. In B. filifolia, total chromosome length at early-metaphase was 40.5 μm, while total chromosome length at mid-metaphase was 23.3 μm. In contrast, B. liniflora showed total chromosome length of 106.1 μm at early-metaphase, and 54.0 μm at mid-metaphase. To compare to the same stage of metaphase, the total length in B. liniflora was nearly twice as long as that of B. filifolia. Two sat-chromosomes were observed in both species.

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© 2007 International Society of Chromosome Botany
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