Forum Topic: Benthamiana ploidy

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Benthamiana ploidy

Hi, I am very confused browsing literature because I can not find a clear statement about the ploidy of N. benthamiana. N. tabacum is clearly an allotetraploid, and tetraploid (2n = 4x = 48), with 4 copies of n=12. Genome size over 4.5 Gb, however, N benthamiana it is reported to be an "ancient" allotetraploid, but currently it is n=19, and 38 total number of chromosomes, so it seems that from the ancient allotetraploid (48 chromosomes), genome fractionation has occurred and 38 remains, and that currently the genome is "diploid" (2n = 2x = 38). Is this correct?. Is N benthamiana diploid?. Thank you very much. Best regards,

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