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New record of chromosome count and B- chromosome in Tinantia erecta (Jacq.) Fenzl collected from different localities of Mussoorie, Uttarakhand (India)

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Abstract

Plants of Tinantia erecta (Jacq.) Fenzl were collected from four localities of Mussoorie, Uttarakhand (India) to investigate their cytological status and course of male meiosis. Three populations revealed the presence of n = 32 and one population showed the presence of n = 34 as the gametophytic chromosome count which is being reported for the first time from India. Presence of B- chromosomes (n = 32 + 0 − 1B) is being reported for the first time at the world level from one of the populations under present study. A detailed study of the course of meiosis revealed presence of irregularities in the form of stickiness, vagrants, interchromosomal connections, chromatin bridges, non-synchronous disjunction of bivalents, laggards and secondary associations. The variation in chromosome number and presence of B-chromosomes however did not have any bearing on the morphology of the plants.

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Acknowledgements

The authors are thankful to the University Grants Commission, New Delhi for providing facilities under DRS SAP III and ASSIST programme. Financial support to Poonam Rani under JRF programme of CSIR is greatly acknowledged. Thanks, are also due to Head, Deparment of Botany, Punjabi University, Patiala for providing the necessary infrastructural facilities.

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  1. Department of Botany, Punjabi University, Patiala, Punjab, 147002, India

    Arneet Grewal & Poonam Rani

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  1. Arneet Grewal
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  2. Poonam Rani
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Correspondence to Poonam Rani.

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Corresponding Editor: Anita Mukherjee; Reviewer: Anath Bandhu Das.

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Grewal, A., Rani, P. New record of chromosome count and B- chromosome in Tinantia erecta (Jacq.) Fenzl collected from different localities of Mussoorie, Uttarakhand (India). Nucleus 65, 73–79 (2022). https://doi.org/10.1007/s13237-021-00359-y

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