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Reporting of B-Chromosomes in Trachyspermum ammi (L.) Sprague (Ajwain)

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To the best of our knowledge this is the first study regarding the reporting of B chromosomes in this plant species. During the meiotic study of Trachyspermum ammi (L.) Sprague, maximum two B chromosomes were reported in diploid plants which were retained in induced autotetraploid after the treatment of 0.2% colchicine at seedling stage. In the present study, the meiotic behaviour of B-chromosomes was analyzed in Trachyspermum ammi (L.) Sprague. The presence of B chromosomes and their number in the plant species of higher ploidy level is controversial. The existence of B chromosomes in polyploids varies from species to species. In the present case, no change has been observed in the number of B chromosomes despite the duplication of A chromosomes in autotetraploid plant. The unaffected number of B chromosomes represents their peculiar behaviour of inheritance. The plant species show adaptive mechanism for their retention in population. In the present study, significant changes (p < 0.05) have been observed in the chiasma frequency and pollen fertility of both diploid carrier plant as compare to non-carrier ones. Furthermore, the chromosomal associations have also been considered with observed number of B chromosomes in autotetraploid carrier plant. In autotetraploid carrier plant, the frequencies of multivalents were found to be quite low in comparison to diploid carrier plant.

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ACKNOWLEDGMENTS

Authors are thankful to NRCSS, Ajmer, Rajasthan, India for supplying seeds of T. ammi var. AA-1. One of the authors (Harshita Dwivedi) is extremely thankful to University Grant Commission (UGC) for financial assistance. Sincere thanks to all the members of Plant Genetics Laboratory for their encouragement and support.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Harshita Dwivedi, Girjesh Kumar Reporting of B-Chromosomes in Trachyspermum ammi (L.) Sprague (Ajwain). Cytol. Genet. 53, 68–75 (2019). https://doi.org/10.3103/S0095452719010079

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