Genome evolution of the psammophyte Pugionium for desert adaptation and further speciation

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Publikace nespadá pod Filozofickou fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
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HU Q.J. MA Y.Z. MALÍK MANDÁKOVÁ Terezie SHI S. CHEN C.L. SUN P.C. ZHANG L. FENG L.D. ZHENG Y.D. FENG X.Q. YANG W.J. JIANG J.B. LI T. ZHOU P.P. YU Q.S. WAN D.S. LYSÁK Martin XI Z.X. NEVO E. LIU J.Q.

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Proceedings of the National Academy of Sciences of the United States of America
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www https://www.pnas.org/content/118/42/e2025711118
Doi http://dx.doi.org/10.1073/pnas.2025711118
Klíčová slova polyploidization; chromosomal structural variation; microhabitat divergence
Popis Deserts exert strong selection pressures on plants, but the underlying genomic drivers of ecological adaptation and subsequent speciation remain largely unknown. Here, we generated de novo genome assemblies and conducted population genomic analyses of the psammophytic genus Pugionium (Brassicaceae). Our results indicated that this bispecific genus had undergone an allopolyploid event, and the two parental genomes were derived from two ancestral lineages with different chromosome numbers and structures. The postpolyploid expansion of gene families related to abiotic stress responses and lignin biosynthesis facilitated environmental adaptations of the genus to desert habitats. Population genomic analyses of both species further revealed their recent divergence with continuous gene flow, and the most divergent regions were found to be centered on three highly structurally reshuffled chromosomes. Genes under selection in these regions, which were mainly located in one of the two subgenomes, contributed greatly to the interspecific divergence in microhabitat adaptation.
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