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Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.

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Abstract

Chromosomal behaviour during megasporogenesis and microsporogenesis has been studied in ornamental Delphinium ajacis L. Meiosis in female sex cell initiates later than male. The floral buds which carry egg mother cell (EMC) at diplotene stage has pollen mother cells (PMCs) at tetrad stage of meiosis suggesting protandry. Although the 16 chromosomes formed regular eight bivalents in both the sex cells, they differed in overall chiasma frequency which was 32.95% higher in EMCs and found to be 18.52 ± 2.12 per cell. In PMCs, the average chiasma frequency recorded was 13.93 ± 1.40 per cell. Interestingly, this variation in chiasma frequency was largely confined to the two large bivalents which shared 42.61% chiasma per EMC. The use of Q–Q plot, Box plot and Whisker plot showed departure in the chiasma frequency distributions in EMCs and PMCs from the normal distribution pattern. The difference in chiasma frequency in the two sex cells was significant at all levels as indicated by the low P values of 3.094 × 10−11 obtained from nonparametric test, i.e. Wilcoxon rank-sum test. It is suggested that the two different mechanisms of recombination are operational in the two sex cells, and the sex differences of chiasma frequency could have arisen due to differential epigenetic modifications of the chromatin which pattern the double-strand breaks, and the position and frequency of crossing over visible as chiasmata.

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Acknowledgements

KKK thanks Sanjeev Dutt Sharma, the Librarian, Hindu College, for providing access to the journals beyond reach. The technical help rendered by Santosh Kumar and Ravi Kumar is also thankfully acknowledged.

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Authors and Affiliations

  1. Department of Botany, Hindu College, University of Delhi, Delhi, 110 007, India

    K. K. Koul

  2. Department of Botany, Ramjas College, University of Delhi, Delhi, 110 007, India

    Ranjna Nagpal

  3. Department of Statistics, Hindu College, University of Delhi, Delhi, 110 007, India

    Kamal Nain

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  1. K. K. Koul
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Correspondence to K. K. Koul.

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Corresponding editor: H. A. Ranganath

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Koul, K.K., Nagpal, R. & Nain, K. Male and female meiosis evince differential patterns in chiasma formation: a case study of ornamental plant, Delphinium ajacis L.. J Genet 99, 40 (2020). https://doi.org/10.1007/s12041-020-1179-x

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