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    Dating the origins of polyploidy events

    A locus-specific marker designed from the SNP site between the paralogous loci produced a single band that also showed clear polymorphism among ginseng cultivars.

    Our data imply that the recent genome duplication has resulted in two highly similar paralogous regions in the ginseng genome.

    The two paralogous sequences could be differentiated by large SSR number variations and one or two additional SNPs or In Dels in every 100 bp of genic region, which can serve as a reliable identifier for each locus.

    are polyploid or with diploid and polyploid cytotypes.

    Two hundred million years of evolution and multiple ploidy levels make this group a unique subject for studying the evolution of polyploidy in animals.As most sturgeon species have gone through significant functional diploidization, 2 scales of ploidy levels can be distinguished: the “evolutionary scale,” which indicates the maximum ploidy level achieved and the “recent scale,” which indicates the current functional ploidy level.This study analyzes published and new microsatellites to check the ploidy level and to determine the degrees of functional diploidization in 10 sturgeon species from Europe and Asia.American Journal of Botany explore the evolutionary importance of polyploidy. Crepis was among the first plant genera studied using biosystematic approaches, and the landmark monograph by Babcock and Stebbins (1938) established the genus as a model for research on asexual polyploids.Research presented in this issue highlights recent advances in old and new topics in the study of polyploidy. Sears and Whitton (2016) revisit Crepis with contemporary data and largely find support for the classic results of Babcock and Stebbins (1938).

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