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  • A conceptual model of events during reproduction of diploid B. stricta.
    in ,

    Establishing the cell biology of apomixis in Boechera

    The genus Boechera (Brassicaceae) is comprised of both sexual and apomictic species, permitting comparative analyses of meiotic disturbances and parthenogenesis. Hybridization, polyploidy and environmental adaptation that arose during the evolution of Boechera may serve as (epi)genetic regulators of apomictic initiation in this genus. Rojek et al. focus on B. stricta, a primarily sexually reproducing species […] More

  • Green smears
    in

    Retrotransposons in holocentric chromosomes of Eleocharis with different ploidy levels

    Long terminal repeat-retrotransposons (LTR-RTs) comprise a large portion of plant genomes, with massive repeat blocks distributed across the chromosomes. Eleocharis (Cyperaceae) species have holocentric chromosomes, and show a positive correlation between chromosome numbers and the amount of nuclear DNA. de Souza et al. present an overview of the diversity and the role of several Copia […] More

  • Vicia cracca
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    Colchicine application and reproductive fitness in Fabaceae

    Unravelling the direct consequences of polyploidization to reveal its evolutionary significance and effects on reproductive fitness, Münzbergová studies diploid offspring of synthetic tetraploid mothers in Vicia cracca (Fabaceae) to assess the effects of colchicine application in the maternal generation. Hitherto there has been a prevailing assumption that the effects of the substances used to create […] More

  • A theoretical overview of crosses involving reduced (dashed arrows) and unreduced (solid arrows) gametes of diploid (red with black stroke) and tetraploid (blue with black stroke) parents and cytotypes of the resulting offspring
    in

    Spatio-temporal dynamics of diploid – polyploid contact zones in an annual herb

    Hybrid zones, or zones of genetic admixture of different intraspecific cytotypes, provide clues to evolutionary transitions and the mechanisms of polyploid speciation. Čertner et al. present insights into the spatio-temporal dynamics of diploid – polyploid contact zones. A combination of flow cytometry and large-scale field sampling enables comparison of cytotype diversity across spatial and temporal […] More

  • Distribution of studied Fosterella cytotypes.
    in

    Ecological range shift and polyploidy in Fosterella

    Distribution of polyploidy along a relatively steep Andean elevation gradient is studied using the genus Fosterella (Bromeliaceae) as a model system. Paule et al. observed an ecological differentiation of cytotypes with polyploids preferentially occupying colder habitats with high annual temperature variability (seasonality). Ancestral chromosome number reconstructions suggest a link between polyploidizations, dispersal events and range […] More

  • Drosera / Sundew.
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    Evolution of genome size and GC content in Droseraceae

    Previous studies have suggested that carnivory and holokinetic chromosomes might be associated with genome downsizing in plants. Veleba et al. analysed genome evolution in sundews (Droseraceae), a widespread genus that uniquely combines chromosomal holokinetics with carnivory, and their relatives to show that this trend is not universally true. An analysis of genomic parameters and their […] More

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    Correlations of polyploidy, apomixis and alpine environmental gradients

    In a recent article published in AoB PLANTS, Schinkel et al. present a study on geographical parthenogenesis, an enigmatic and much disputed phenomenon that involves closely related sexual and apomictic (asexually reproducing) taxa displaying largely divergent distribution patterns. Based on a large sampling of natural populations of Ranunculus kuepferi, their study is the first quantitative, […] More

  • Neighbour-net diagram based on AFLP profiles of 460 Cyanus
    in

    On the origins of Balkan endemics

    The Balkan Peninsula is one of the most important centres of plant diversity in Europe. Yet its flora is still largely unexplored and calls for further investigations. Olšavská et al. focus on Balkan taxa of the Cyanus napulifer group (Asteraceae), comprising a number of local endemics. Using variation genetic markers, relative DNA content and multivariate […] More

  • Photomicrographs obtained from bio-SEM analyses of A. zerumbet shoot nuclear suspensions using different isolation buffers.
    in

    Does removal of secondary metabolites improve Zingiberaceous nuclei quality?

    The family Zingiberaceae is well known for its range of secondary constituents and bioactive metabolites, such as flavonoids, phenolic acids and essential oils known to increase nuclei stickiness in cell free lysate. As single nuclei of correct shape and size are the prerequisites for accurate genome size estimation by flow cytometry, Sadhu et al. present […] More

  • Geographical locations of populations of Alnus glutinosa and A. incana across the study area.
    in

    Geographic distribution of the two cytotypes of Alnus glutinosa in Europe

    Polyploidy in plants has been studied extensively. In many groups, two or more cytotypes represent separate biological entities with distinct distributions, histories and ecology. Mandák et al. analysed ploidy level variation in populations of Alnus glutinosa over the whole Europe. In addition to diploid populations they for the first time report the occurrence of tetraploid […] More

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