Meiosis in males of the brown planthopper, Nilaparvata lugens
1986
Liquido, Nicanor J.
Meiosis in spermatocytes was studied among the three biotypes of the brown planthopper, Nilaparvata lugens (Stål). The chromosome number, morphology, and behavior of the biotypes were similar. The auto-somes divided normally, reductional for the first division and equational for the second. The X chromosome had an unstable segregation behavior; it may segregate equationally or reductionally during the first division depending on its chromatids' orientation. Metaphase I plates contained 14 autosomal bivalents and an X chromosome (14II + X). The co-oriented sister chromatids of the X chromosome moved together to either one of the poles during anaphase I, while auto-oriented sister chromatids segregated to opposite poles. Because of the anomalous segregation behaviour of the X chromosome, metaphase II plates may both contain 14I + X chromatid, or one with only 14I and the other with 14I + X chromosome. Male N. lugens has a diploid chromosome number of 29.
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