Haploid meiosis and its bearing on the phylogeny of pearl millet,Pennisetum typhoides stapf et hubb. (original) (raw)
Abstract
Meiotic chromosome associations in a spontaneously originated haploid plant of pearl millet have been studied and their phyletic significance discussed. Chromosome pairing could be observed at pachytene and diplotene. Out of a total of 285 PMC's studied at diakinesis-metaphase 1, 43 showed one bivalent and 7 had two bivalents per cell. Both rod- and ring-bivalents were observed. Apart from synapsis accompanied by chiasma formation, close associations of univalent chromosomes were observed. Out of 150 cells without true bivalents, 41 showed 1 s-s association and five, 2 s-s pairs per cell. On the basis of the realization of a maximum of two bivalents per cell, as also of a maximum of 2 s-s pairs, it has been inferred that the chromosome complement of_P. typhoides_ (_n_=7) has evolved from a basic set of_n_=5 chromosomes. Other available evidence supporting this inference is also discussed.
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Authors and Affiliations
- Division of Gonetics, Indian Agricultural Research Institute, New Delhi-12, India
Prem P. Jauhar
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Jauhar, P.P. Haploid meiosis and its bearing on the phylogeny of pearl millet,Pennisetum typhoides stapf et hubb..Genetica 41, 532–540 (1970). https://doi.org/10.1007/BF00958932
- Received: 13 July 1970
- Issue date: December 1970
- DOI: https://doi.org/10.1007/BF00958932