Suryawanshi, V; Talke, IN; Weber, M; Eils, R; Brors, B; Clemens, S; Krämer, U: Between-species differences in gene copy number are enriched among functions critical for adaptive evolution in Arabidopsis halleri., BMC Genomics(17), 3319 (2016), doi:10.1186/s12864-016-3319-5
Abstract:
Gene copy number divergence between species is a form of genetic polymorphism that contributes significantly to both genome size and phenotypic variation. In plants, copy number expansions of single genes were implicated in cultivar- or species-specific tolerance of high levels of soil boron, aluminium or calamine-type heavy metals, respectively. Arabidopsis halleri is a zinc- and cadmium-hyperaccumulating extremophile species capable of growing on heavy-metal contaminated, toxic soils. In contrast, its non-accumulating sister species A. lyrata and the closely related reference model species A. thaliana exhibit merely basal metal tolerance.
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