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  • The origin of the sporophyte shoot (Viewpoint)
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    The origin of the sporophyte shoot (Viewpoint)

    The long-held notion that the sporophyte shoot is homologous with the seta of mosses has been questioned, but no alternative evolutionary model has hitherto been proposed. Ligrone et al. explore the origin of the sporophyte shoot in terms of changes in embryo organization, within the framework of molecular phylogeny placing the three bryophyte lineages at the […] More

  • Growth regulators and germination of recalcitrant seeds
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    Growth regulators and germination of recalcitrant seeds

    Growth regulators and germination of recalcitrant seeds There is relatively little information avialable regarding the role of plant growth regulators in the germination of recalcitrant seeds. Pieruzzi et al. determine an increase in the ratio of the polyamines (spermidine + spermine) : putrescine in the embryos of germinating Araucaria angustifolia (gymnosperm) and Ocotea odorifera (angiosperm), which could be […] More