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Karyomere formation in cleaving eggs of Tetradontophora bielanensis (Collembola)

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Klag J., Jura C., Krzysztofowicz A., Kisiel E.

Folia Biologica

1995

vol. 43

issue 1-2

61-67

The term "karyomere"designates a p[articular kind oforganization of the telophase nucleus, in which each individual chromosome is surrounded by a typical nuclear envelope, thus representing a small nuclear structure.In T.bielenensis they are formed during firts prophase and subsequently change into chromosomes making a metaphase plate.Each metaphase chromosome is completly enclosed by a double envelope, similar to a nuclear one but devoid of nuclear pores.The only place on the chromosome where the envelope is not complete is the region of the kinetochore.Anaphase starts with the division of the chromosome into chromatids and subsequent decondensation of the latter.During anaphase, te process of decondensation of the chromatids starts at the leading ends of each chromatid and hence, they acquire a tennis racket-like appearance.As a result, on the spindle poles two groups of the chromosome vesicles or karyomeres are gethered.Each karyomere has the appearance of a typical nucleus enclosed by a double envelope pierced by nucleus pores filed with nucleoplasm containing patches ofchromatin.It is suggested that karyomeres are formed only in species with a large amount of chromatin in their nuclei.

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1 Folia Biologica

1 1995

1 Jura C.

1 Kisiel E.

1 Klag J.

1 Krzysztofowicz A.

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Karyomere formation in cleaving eggs of Tetradontophora bielanensis (Collembola)