The evolution of huge Y chromosomes inCoccinia grandisand its sister,Coccinia schimperi

Author:

Janousek Bohuslav1ORCID,Gogela Roman1ORCID,Bacovsky Vaclav1ORCID,Renner Susanne S.2ORCID

Affiliation:

1. Institute of Biophysics of the Czech Academy of Sciences, Královopolská 135, 61265 Brno, Czech Republic

2. Department of Biology, Washington University, Saint Louis, MO, USA

Abstract

Microscopically dimorphic sex chromosomes in plants are rare, reducing our ability to study them. One difficulty has been the paucity of cultivatable species pairs for cytogenetic, genomic and experimental work. Here, we study the newly recognized sistersCoccinia grandisandCoccinia schimperi, both with large Y chromosomes as we here show forCo. schimperi. We built genetic maps for male and femaleCo. grandisusing a full-sibling family, inferred gene sex-linkage, and, withCo. schimperitranscriptome data, tested whether X- and Y-alleles group by species or by sex. Most sex-linked genes for which we could include outgroups grouped the X- and Y-alleles by species, but some 10% instead grouped the two species' X-alleles. There was no relationship between XY synonymous-site divergences in these genes and gene position on the non-recombining part of the X, suggesting recombination arrest shortly before or after species divergence, here dated to about 3.6 Ma.Coccinia grandisandCo. schimperiare the species pair with the most heteromorphic sex chromosomes in vascular plants (the condition in their sister remains unknown), and future work could use them to study mechanisms of Y chromosome enlargement and parallel degeneration, or to test Haldane's rule about lower hybrid fitness in the heterogametic sex.This article is part of the theme issue ‘Sex determination and sex chromosome evolution in land plants’.

Funder

Grantová Agentura České Republiky

Publisher

The Royal Society

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Transcriptomics reveal useful resources for examining fruit development and variation in fruit size in Coccinia grandis;Frontiers in Plant Science;2024-05-28

2. Sexy ways: approaches to studying plant sex chromosomes;Journal of Experimental Botany;2024-04-23

3. Sex-chrom v. 2.0: a database of green plant species with sex chromosomes;Chromosoma;2023-02-02

4. The evolution of huge Y chromosomes inCoccinia grandisand its sister,Coccinia schimperi;Philosophical Transactions of the Royal Society B: Biological Sciences;2022-03-21

5. The contributions of Nettie Stevens to the field of sex chromosome biology;Philosophical Transactions of the Royal Society B: Biological Sciences;2022-03-21

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