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Cytogenetical Studies in Narenga porphyrocoma

D. Jagathesan, T. V. Sreenivasan

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Abstract

Meiosis and pollen mitosis were studied in twenty plants of Narenga poyphyyoconla. Karyotype was analysed and found to be asymmetrical and belong to 2b type according to Stebbin's (1958) system of classification. Meiotic abnormalities such as bridges, laggards and cells with different chromosome numbers were observed. It is suggested that these mosaics have probably arisen due to one pair of homologous chromosomes possessing a weak centromere and abnormalities in postmeiotic cell divisions.

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Meiosis and pollen mitosis were studied in twenty plants of Narenga poyphyyoconla. Karyotype was analysed and found to be asymmetrical and belong to 2b type according to Stebbin's (1958) system of classification. Meiotic abnormalities such as bridges, laggards and cells with different chromosome numbers were observed. It is suggested that these mosaics have probably arisen due to one pair of homologous chromosomes possessing a weak centromere and abnormalities in postmeiotic cell divisions.

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Available abstract

Meiosis and pollen mitosis were studied in twenty plants of Narenga poyphyyoconla. Karyotype was analysed and found to be asymmetrical and belong to 2b type according to Stebbin's (1958) system of classification. Meiotic abnormalities such as bridges, laggards and cells with different chromosome numbers were observed. It is suggested that these mosaics have probably arisen due to one pair of homologous chromosomes possessing a weak centromere and abnormalities in postmeiotic cell divisions.

Key concepts: Biology, Meiosis, Centromere, Homologous chromosome, Mitosis, Karyotype, Pollen, Chromosome

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