Ultrastructure of chromatin organization in diffused-centromeric chromosomes of Drosera as compared with localized-centromeric chromosomes of Drosophyllum (Droseraceae) detected by scanning electron microscopy

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Condensation process of chromatins in Drosera roseana and D. falconerii toward the mitotic metaphase is different from that of Drosophyllum lusitanicum : Chromatin fibres in the small-sized chromosomes at metaphase in the species of Drosera are not clearly visible on the surface and are folded and loaded compactly to form bigger classes of fibers and the knob-like, globular structures, while those 40-70 nm diameter in the large-sized chromosomes in Drosophyllum lusitanicum are clearly visible and relatively loose on the surface and are fold to form condensed chromosomes without other intermediate level of fibres. The chromosomes of the two species of Drosera do not show any single localized centromere and those at prometaphase and metaphase have the longitudinal gap between their sister chromatids. Some chromosomes are often conjugated at terminal end with each other, and show small dents interrupting the chromatid attachment at metaphase-to-anaphase transition stage and the chromatids or the newly separated chromosome are oriented their long axis parallel to the equatorial plate and to each other. Several possible spindle attachment sites could be detected on a poleward side of metaphase chromosomes.
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