Abstract
A triploid hybrid with an ABC genome constitution, produced from an interspecific cross between Brassica napus (AACC genome) and B. nigra (BB genome), was used as source material for chromosome doubling. Two approaches were undertaken for the production of hexaploids: firstly, by self-pollination and open-pollination of the triploid hybrid; and secondly, by application of colchicine to axillary meristems of triploid plants. Sixteen seeds were harvested from triploid plants and two seedlings were confirmed to be hexaploids with 54 chromosomes. Pollen viability increased from 13% in triploids to a maximum of 49% in hexaploids. Petal length increased from 1.3 cm (triploid) to 1.9 cm and 1.8 cm in the two hexaploids and longest stamen length increased from 0.9 cm (triploid) to 1.1 cm in the hexaploids. Pollen grains were longer in hexaploids (43.7 and 46.3 μm) compared to the triploid (25.4 μm). A few aneuploid offsprings were also observed, with chromosome number ranging from 34 to 48. This study shows that trigenomic hexaploids can be produced in Brassica through interspecific hybridisation of B. napus and B. nigra followed by colchicine treatment.
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Acknowledgements
This research is supported by Co-operative Bulk Handling Pty Ltd and the Faculty of Natural and Agricultural Sciences at The University of Western Australia, and UPA (University Postgraduate Award) scholarship to Aneeta Pradhan. We thank Winthrop Professor Kadambot Siddique for valuable support; Dr MarieClaire Castello, Dr Chhaya Atri, Dr Made Pharmawati and Cui Cheng for technical help and Damber Bahadur Shrestha for his help with the statistical analysis using SAS 9.2 software.
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Pradhan, A., Plummer, J.A., Nelson, M.N. et al. Successful induction of trigenomic hexaploid Brassica from a triploid hybrid of B. napus L. and B. nigra (L.) Koch. Euphytica 176, 87–98 (2010). https://doi.org/10.1007/s10681-010-0218-8
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DOI: https://doi.org/10.1007/s10681-010-0218-8