Karyotype and Meiotic Chromosome Behavior of Leaf Sucking Bug (Strachia crucigera)
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Abstract
Leaf sucking bug or black cabbage bug, Strachia crucigera is an insect that lives in vegetable plots, including cabbage and cauliflower. It has a particular type of chromosome called holocentric chromosomes that allow fragmented chromosomes to move to a pole at anaphase, thus preventing chromosome loss. In this study, the black cabbage bugs collected from Chon Buri province were studied for meiotic chromosome behavior and karyotype using aceto-orcein staining. The result revealed that the chromosome complement of Strachia crucigera was 2n = 14 (12A+XY). Meiotic chromosome behaviors showed that autosomes divided pre-reductionally while sex chromosomes divided post-reductionally (divide equationally at anaphase I but divide reductionally at anaphase II). At metaphase I, the sex chromosomes, X and Y, often formed a pseudo-bivalent at the center of the ring, while the autosomal bivalents were arranged in a circle. Meiosis cell division of this insect is similar to that of other Heteropteran species (insect, Hemiptera).
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