Recent Y chromosome divergence despite ancient origin of dioecy in poplars (Populus)

Molecular Ecology
A GeraldesQuentin C B Cronk

Abstract

All species of the genus Populus (poplar, aspen) are dioecious, suggesting an ancient origin of this trait. Despite some empirical counter examples, theory suggests that nonrecombining sex-linked regions should quickly spread, eventually becoming heteromorphic chromosomes. In contrast, we show using whole-genome scans that the sex-associated region in Populus trichocarpa is small and much younger than the age of the genus. This indicates that sex determination is highly labile in poplar, consistent with recent evidence of 'turnover' of sex-determination regions in animals. We performed whole-genome resequencing of 52 P. trichocarpa (black cottonwood) and 34 Populus balsamifera (balsam poplar) individuals of known sex. Genomewide association studies in these unstructured populations identified 650 SNPs significantly associated with sex. We estimate the size of the sex-linked region to be ~100 kbp. All SNPs significantly associated with sex were in strong linkage disequilibrium despite the fact that they were mapped to six different chromosomes (plus 3 unmapped scaffolds) in version 2.2 of the reference genome. We show that this is likely due to genome misassembly. The segregation pattern of sex-associated SNPs revealed this to b...Continue Reading

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Citations

Jan 23, 2016·Molecular Ecology·Loren Rieseberg, Armando Geraldes
Jun 9, 2015·The New Phytologist·Deborah Charlesworth
Jun 27, 2015·Molecular Ecology·Dmitry A Filatov
Dec 15, 2015·Annual Review of Plant Biology·Deborah Charlesworth
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Jul 12, 2018·Plant Biotechnology Journal·Hui-Min JiaZhong-Shan Gao
Aug 28, 2018·PLoS Biology·Jacob A TennessenTia-Lynn Ashman
Oct 31, 2018·Proceedings of the National Academy of Sciences of the United States of America·Yao-Cheng LinNathaniel R Street
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Jul 20, 2018·Molecular Genetics and Genomics : MGG·Ran ZhouStephen P DiFazio
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Dec 16, 2016·The Journal of Heredity·Alex Harkess, Jim Leebens-Mack
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Aug 28, 2020·Frontiers in Plant Science·Quentin Cronk, Niels A Müller
Jun 9, 2020·International Journal of Genomics·Wencai WangXianzhi Zhang

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