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  • Lolium perenne
    in

    Carbon stores support efficient nitrate use during regrowth of perennial ryegrass

    Plant regrowth in response to defoliation relies on efficient nitrogen use. Roche et al. find that remobilisation of water soluble carbohydrate stores in leaves of perennial ryegrass (Lolium perenne) is coordinated with nitrogen availability to support efficient N assimilation into amino acids in leaf and sheath tissues. Spatiotemporal changes in cytokinin content in response to […] More

  • Response of Pisum sativum following seed inoculation with Rhodococcus fascians.
    in

    Virulent Rhodococcus fascians maintains cotyledons as a sink tissue

    Both pathogenic and epiphytic organisms obtain nutrients from host plants. Dhandapani et al. show the differential impact of an epiphytic (avirulent) strain and a pathogenic strain of the cytokinin-producing bacterium, Rhodococcus fascians on source/sink relationships within pea cotyledons during and following germination. Both strains commandeered resources from the cotyledon, but only the pathogenic strain markedly […] More

  • Schematic representation of the role of cytokinins in plant growth and defence against biotrophic pathogens, and in the growth–defence trade-off.
    in

    Should I fight or should I grow? Cytokinins in defence-growth trade-offs

    Constitutive defence activation in plants leads to resistance to a broad-spectrum of pathogens, but also frequently to stunted growth and reduced seed sets; how do plants decide whether to defend against infection or to utilise energy for growth? Plant hormones are important integrators of the physiological responses that influence the outcome of plant-pathogen interactions. Albrecht […] More

  • Scenedesmus obliquus
    in

    Phytohormone profiles and metabolism in cyanobacteria and algae

    The majority of available data on phytohormone profiles and metabolism concerns vascular plants. Žižková et al. monitor the mechanisms by which two main groups of phytohormones, cytokinins and auxins, control homeostasis in cyanobacteria and algae, aquatic communities which exhibit a different metabolic modus operandi to vascular plants. An analysis of cytokinin oxidase/dehydrogenase activity, tRNA-bound cytokinins, […] More

  • Aldrovanda vesiculosa
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    Polar growth and the development of aquatic carnivorous plants

    Cytokinin and auxin biosynthesis and distribution patterns have been studied intensively in many terrestrial plant species. Until now, no direct phytohormonal screening has been carried out in rootless, aquatic, carnivorous plants. Šimura et al. present here insight into cytokinin and auxin levels, their distribution and relative abundance in segmented shoots and turions of Aldrovanda vesiculosa […] More

  • Cytokinins are implicated in keeping green kiwifruit green
    in

    Cytokinins are implicated in keeping green kiwifruit green

    Kiwifruit species that have either green flesh (Actinidia deliciosa ‘Haywood’) or gold flesh (A. chinensis ‘Hort 16A’) at harvest provide an interesting comparative system to investigate the mechanism of degreening in ripening fruit. Pilkington et al. find that fruit of both species have elevated levels of cytokinins during ripening, yet only the green kiwifruit has elevated […] More