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It is a matter of great serendipity that while studying cytogenetics of Eclipta alba (L.) Hassk. we reported B chromosome. It is the maiden study regarding the reporting of B chromosomes in this plant species as per our knowledge. During the meiotic study of Eclipta alba (L.) Hassk maximum three B chromosomes were reported in Bhringraj. The study deals with the effect of B chromosomes on A chromosome chiasma frequency, chiasma distribution, and pollen fertility in Eclipta alba (L.) Hassk. The results suggest that B chromosome enhances the chiasma frequency, and also increases variations in carrier and non-carrier pollen mother cells (PMCs). Moderate reduction in fertility of carrier plants, in contrast to non-carriers could also be recorded. With regard to earlier investigations, the possible mechanism of action of B-chromosomes has been discussed. Aside from their intrinsic enigmatic properties, B-chromosomes might be a useful experiment tool to study the wider issues of genome organization and evolution in plants.

Key words: B chromosomes, Chiasma, carrier and non-carrier plants, fertility, meiosis

Tsitologiya i Genetika 2022, vol. 56, no. 2, pp. 73-74

  • Plant Genetics Laboratory, Department of Botany, University of Allahabad, Prayagraj-211002

E-mail: radhauniv2015


In "Cytology and Genetics":
Girjesh Kumar & Radha Mishra De Novo Reporting of B Chromosomes with Their Bewildermentic Responses in Eclipta alba (L.) Hassk, Cytol Genet., 2022, vol. 56, no. 2, pp. 179184
DOI: 10.3103/S0095452722020050


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