Abstract
A repeated sequence of 180 bp in tandem array has been isolated from the dioecious plant species Rumex acetosa which has a multiple sex chromosome system, XX♀/XY1Y2♂. There are two or three thin C-bands on the X while the Ys are almost entirely heteropycnotic and DAPI-positive but contain no C-band material. The Ys thus represent massive blocks of facultative heterochromatin. The 180 bp sequence has been localized to the X and both Y chromosomes by in situ hybridization. The molecular data support an origin of the sex-multiple from a homomorphic chromosome pair rather than from a sex chromosome/autosome translocation.
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Rejón, C., Jamilena, M., Garrido Ramos, M. et al. Cytogenetic and molecular analysis of the multiple sex chromosome system of Rumex acetosa. Heredity 72, 209–215 (1994). https://doi.org/10.1038/hdy.1994.28
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DOI: https://doi.org/10.1038/hdy.1994.28
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