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  • Härjedalen
    in

    No sexual niche partitioning in a dioecious moss

    Roughly half of the species of bryophytes have separate sexes (dioecious) and half are hermaphroditic (monoecious). This variation has major consequences for the ecology and evolution of the different species. In some sexually reproducing dioecious bryophytes, sex ratio has been shown to vary with environmental conditions. Bisang et al. use a specifically designed molecular marker […] More

  • Reproductive differentiation into sexual and apomictic cytotypes
    in

    Reproductive differentiation into sexual and apomictic cytotypes

    Mechanisms enabling the maintenance of sexual and apomictic modes of seed formation in sympatry are poorly understood. Dobeš et al. study populations of Potentilla puberula representing various combinations of five polyploid cytotypes (tetraploid–octoploid) and use a flow cytometric seed screen to calculate the male genomic contribution to the embryo and endosperm. They find a rare […] More

  • Gene function, reproduction and climate change (Review)
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    Gene function, reproduction and climate change (Review)

    Studies have suggested that plant sexual reproduction is particularly vulnerable to climate change, and a number of ecologically and evolutionarily relevant genes have recently been identified. Shimizu et al. consider that studying gene functions in naturally fluctuating conditions is very important in order to predict responses to changing environments. For example, modelling has shown that FLC in […] More

  • TcCRP1 as a pollen-tube attractant in Torenia
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    TcCRP1 as a pollen-tube attractant in Torenia

    A key factor of pollen-tube attraction to an ovule is that it is species-specific, and recently a family of secreted proteins with attractant properties has been discovered in Torenia fournieri. Kanaoka et al. study TcCRP1, an orthologous gene of TfCRP1 from T. concolor, and find it is expressed predominantly in the synergid cell. The gene product […] More

  • Apomixis is not prevalent in a high-alpine ecosystem
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    Apomixis is not prevalent in a high-alpine ecosystem

    `Apomixis is not prevalent in a high-alpine ecosystem Apomixis (agamospermy) is expected to provide selective advantages in high alpine environments, where conditions tend to be unfavourable for sexual reproduction of flowering plants. Hörandl et al. use flow cytometric seed screening to look for apomixis in 14 species typical for the glacier regions of the European Alps, […] More