Abstract
Genome types of 22 banana specimens (Musa species) and one species of Ensete from Arunachal Pradesh and Manipur, North Eastern India, were characterized by morphological scoring system and IRAP-PCR molecular technique. Sixteen specimens were identified up to species levels, and six were identified as cultivars/hybrids of Musa acuminata (AA) and M. balbisiana (BB). Seven Musa specimens were classified as members of the ornamental banana under the section Rhodochlamys, whereas 15 were members of the section Eumusa. Score card based characterization revealed five genome types of which majority of the banana specimens belongs to allopolyploids (19) while only four were autopolyploids. Allotriploid genomes (AAB/ABB) were the largest group recorded in 15 specimens while, autopolyploid genomes (AA/AAA and BB/BBB) were found in four specimens. Genome distribution varied from highest of 45% in AAB (Dessert banana) followed by 23% ABB (Cooking banana), 17% AB (Ney Poovan), and 9% each for AA/AAA (Cavendish group) and BB/BBB (Saba group), respectively. The genome type of Ensete glaucum was found to be allodiploid (AB). Molecular characterization using IRAP-PCR profiles revealed the presence of B genome specific band (~350 bp) in 21 specimens except two specimens of M. acuminata. This band is considered to be a characteristic signature of M. balbisiana genome type (BB). The brightness intensities of the B specific band were significantly high in M. balbisiana as compared to other specimens. A larger size band of ~430 bp and another small sized band of ~250 bp were observed in the two specimens of M. acuminata as well as in all other specimens identified to have “A” genome except M. balbisiana. Based on this study, presence of ~430 bp DNA band in IRAP profiles of banana can be considered as a signature band for identification of A genome in wild and cultivated bananas. The present study concludes that morphological scoring system could classify genome types with their economic values while IRAP-PCR based molecular characterization can validate presence or absence of A or B genome types in wild species and cultivated varieties of banana.
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The authors declare that they have no conflict of interest.
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Authors gratefully acknowledge the Department of Biotechnology, Government of India sponsored Bioinformatics Infrastructure Facility (DBT-BIF), Department of Forestry for providing research facilities and studentship during the study.
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Ranibala, G., Sureshkumar Singh, S., Khan, M.L. (2022). Morphological and Molecular Characterization of Genome Types in Wild and Cultivated Bananas (Musa Species) of Two States in North Eastern India. In: Kumar, A., Choudhury, B., Dayanandan, S., Khan, M.L. (eds) Molecular Genetics and Genomics Tools in Biodiversity Conservation. Springer, Singapore. https://doi.org/10.1007/978-981-16-6005-4_14
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