Seed progeny studies in alliums. II. Male meiosis in the progeny plants of tetraploid Allium tuberosum Rottl. ex Spreng.

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  • Gohil R. N.
    Cytogenetics Laboratory, Department of Botany, University of Kashmir
  • Koul A. K.
    Cytogenetics Laboratory, Department of Botany, University of Kashmir Department of Biosciences, University of Jammu

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  • II. Male meiosis in the progeny plants of tetraploid <i>Allium tuberosum</i> Rottl. ex Spreng

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Details of male meiosis have been studied in a seed progeny of autotetraploid desynaptic Allium tuberosum. Of the fifty plants scored four were aneuploids; two each with 31 and 33 chromosomes. There is a lot of variation in the pairing behaviour of the chromosomes of these plants. The frequency of desynaptic cells is considerably increased. The male sporogenous tissue of the progeny plants is chimeric with cells having zygoid and double the zygoid number of chromosomes. Meiosis in the pollen mother cells with zygoid number of chromosomes is abnormal characterized by the presence of multivalents, bivalents and univalents at metaphase I and unequal distribution of chromosomes, presence of chromatin bridge/s and fragments and laggards at anaphase. Male meiosis in the cells with double the zygoid number is perfectly normal with the formation of bivalents only resulting in equal separation of chromosomes at anaphase.

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