• Activity of xyloglucan endotransglucosylases/hydrolases suggests a role during host invasion by the parasitic plant Cuscuta reflexa 

      Olsen, Stian; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-04-27)
      The parasitic vines of the genus Cuscuta form haustoria that grow into other plants and connect with their vascular system, thus allowing the parasite to feed on its host. A major obstacle that meets the infection organ as it penetrates the host tissue is the rigid plant cell wall. In the present study, we examined the activity of xyloglucan endotransglucosylases/hydrolases (XTHs) during the ...
    • Cellulase activity screening using pure carboxymethylcellulose: Application to soluble cellulolytic samples and to plant tissue prints. 

      Johnsen, Hanne Risan; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)
      Reliable, rapid and inexpensive detection of cellulolytic enzymes that can be used for a wide variety of biological and environmental samples are currently in high demand. Here, a new cellulase detection protocol is described that circumvents problems observed with popular agar-based methods by exploiting the ability of carboxymethylcellulose (CMC) to form gel-like surfaces on its own. These pure ...
    • The Chloroplast Ribonucleoprotein CP33B Quantitatively Binds the psbA mRNA 

      Teubner, Marlene; Lenzen, Benjamin; Espenberger, Lucas Bernal; Fuss, Janina; Nickelsen, Jörg; Krause, Kirsten; Ruwe, Hannes; Schmitz-Linneweber, Christian (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-17)
      Chloroplast RNAs are stabilized and processed by a multitude of nuclear-encoded RNA-binding proteins, often in response to external stimuli like light and temperature. A particularly interesting RNA-based regulation occurs with the <i>psbA</i> mRNA, which shows light-dependent translation. Recently, the chloroplast ribonucleoprotein CP33B was identified as a ligand of the <i>psbA</i> mRNA. We here ...
    • Complete DNA sequences of the plastid genomes of two parasitic flowering plant species, Cuscuta reflexa and Cuscuta gronovii 

      Krause, Kirsten; Funk, Helena T.; Berg, Sabine; Krupinska, Karin; Maier, Uwe G. (Journal article; Tidsskriftartikkel; Peer reviewed, 2007-08-22)
      Background: The holoparasitic plant genus Cuscuta comprises species with photosynthetic capacity and functional chloroplasts as well as achlorophyllous and intermediate forms with restricted photosynthetic activity and degenerated chloroplasts. Previous data indicated significant differences with respect to the plastid genome coding capacity in different Cuscuta species that could correlate with ...
    • Cuscuta campestris fine-tunes gene expression during haustoriogenesis as an adaptation to different hosts 

      Bawin, Thomas Georges A; Didriksen, Alena; Faehn, Corine Alexis; Olsen, Stian; Sørensen, Iben; Rose, Jocelyn KC; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-14)
      The Cuscuta genus comprises obligate parasitic plants that have an unusually wide host range. Whether Cuscuta uses different infection strategies for different hosts or whether the infection strategy is mechanistically and enzymatically conserved remains unknown. To address this, we investigated molecular events during the interaction between field dodder (Cuscuta campestris) and two host species ...
    • Dual Targeting and Retrograde Translocation: Regulators of Plant Nuclear Gene Expression Can Be Sequestered by Plastids 

      Krause, Kirsten; Oetke, Svenja; Krupinska, Karin (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      Changes in the developmental or metabolic state of plastids can trigger profound changes in the transcript profiles of nuclear genes. Many nuclear transcription factors were shown to be controlled by signals generated in the organelles. In addition to the many different compounds for which an involvement in retrograde signaling is discussed, accumulating evidence suggests a role for proteins in ...
    • The enigma of interspecific plasmodesmata: insight from parasitic plants 

      Fischer, Karsten; Lachner, Lena Anna-Maria; Olsen, Stian; Mulisch, Maria; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-01)
      Parasitic plants live in intimate physical connection with other plants serving as their hosts. These host plants provide the inorganic and organic compounds that the parasites need for their propagation. The uptake of the macromolecular compounds happens through symplasmic connections in the form of plasmodesmata. In contrast to regular plasmodesmata, which connect genetically identical cells of ...
    • Extreme Features of the Galdieria sulphuraria Organellar Genomes: A Consequence of Polyextremophily? 

      Jain, Kanika; Krause, Kirsten; Grewe, Felix; Nelson, Gaven F; Weber, Andreas PM; Christensen, Alan C; Mower, Jeffrey P (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-12-13)
      Nuclear genome sequencing from extremophilic eukaryotes has revealed clues about the mechanisms of adaptation to extreme environments, but the functional consequences of extremophily on organellar genomes are unknown. To address this issue, we assembled the mitochondrial and plastid genomes from a polyextremophilic red alga, Galdieria sulphuraria strain 074 W, and performed a comparative genomic ...
    • Footprints of parasitism in the genome of the parasitic flowering plant Cuscuta campestris 

      Vogel, Alexander; Schwacke, Rainer; Denton, Alisandra; Usadel, Björn; Hollmann, Julien; Fischer, Karsten; Bolger, Anthony; Schmidt, Maximilian; Bolger, Marie; Grundlach, Heidrun; Mayer, Klaus F.X.; Weiss-Schneeweiss, Hanna; Temsch, Eva M.; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-06-28)
      A parasitic lifestyle, where plants procure some or all of their nutrients from other living plants, has evolved independently in many dicotyledonous plant families and is a major threat for agriculture globally. Nevertheless, no genome sequence of a parasitic plant has been reported to date. Here we describe the genome sequence of the parasitic field dodder, Cuscuta campestris. The genome contains ...
    • Getting ready for host invasion: Elevated expression and action of xyloglucan endotransglucosylases/hydrolases in developing haustoria of the holoparasitic angiosperm Cuscuta 

      Olsen, Stian; Ketelsen Striberny, Bernd; Hollmann, Julien; Schwacke, Rainer; Popper, Zoe A.; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2015-11-11)
      Changes in cell walls have been previously observed in the mature infection organ, or haustorium, of the parasitic angiosperm Cuscuta, but are not equally well charted in young haustoria. In this study, we focused on the molecular processes in the early stages of developing haustoria; that is, before the parasite engages in a physiological contact with its host. We describe first the identification ...
    • A highly efficient protocol for transforming Cuscuta reflexa based on artificially induced infection sites 

      Lachner, Lena Anna-Maria; Galstyan, Levon; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-08-10)
      The parasitic plant genus <i>Cuscuta</i> is notoriously difficult to transform and to propagate or regenerate in vitro. With it being a substantial threat to many agroecosystems, techniques allowing functional analysis of gene products involved in host interaction and infection mechanisms are, however, in high demand. We set out to explore whether <i>Agrobacterium</i>‐mediated transformation of ...
    • A host-free transcriptome for haustoriogenesis in Cuscuta campestris: signature gene expression identifies markers of successive development stages 

      Bawin, Thomas Georges A; Bruckmüller, Julien-Alexander; Olsen, Stian; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01-20)
      The development of the infection organ of the parasitic angiosperm genus Cuscuta is a dynamic process that is normally obscured from view as it happens endophytically in its host. We artificially induced haustoriogenesis in C. campestris by far-red light to define specific morphologically different stages and analyze their transcriptional patterns. This information enabled us to extract sets of ...
    • Innovating carbon-capture biotechnologies through ecosystem-inspired solutions 

      Schweitzer, Hannah; Aalto, Nerea Johanna; Busch, Wolfgang; Chan, Dennis Tin Chat; Chiesa, Matteo; Elvevoll, Edel O.; Gerlach, Robin; Krause, Kirsten; Mocaer, Karel; Moran, James J.; Noel, Joseph P.; Patil, Shalaka Kiran; Schwab, Yannick; Wijffels, Rene Hubertus; Wulff, Angela; Øvreås, Lise; Bernstein, Hans Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-22)
      Rising atmospheric carbon concentrations affect global health, the economy, and overall quality of life. We are fast approaching climate tipping points that must be addressed, not only by reducing emissions but also through new innovation and action toward carbon capture for sequestration and utilization (CCSU). In this perspective, we delineate next-generation biotechnologies for CCSU supported by ...
    • Innovating carbon-capture biotechnologies through ecosystem-inspired solutions 

      Schweitzer, Hannah; Aalto, Nerea Johanna; Busch, Wolfgang; Chan, Dennis Tin Chat; Chiesa, Matteo; Elvevoll, Edel O.; Gerlach, Robin; Krause, Kirsten; Mocaer, Karel; Moran, James J.; Noel, Joseph P.; Patil, Shalaka Kiran; Schwab, Yannick; Wijffels, Rene Hubertus; Wulff, Angela; Øvreås, Lise; Bernstein, Hans Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-22)
      Rising atmospheric carbon concentrations affect global health, the economy, and overall quality of life. We are fast approaching climate tipping points that must be addressed, not only by reducing emissions but also through new innovation and action toward carbon capture for sequestration and utilization (CCSU). In this perspective, we delineate next-generation biotechnologies for CCSU supported by ...
    • MapMan4: a refined protein classification and annotation framework applicable to multi-omics data analysis. 

      Schwacke, Rainer; Ponce-Soto, Gabriel Y.; Krause, Kirsten; Bolger, Anthony; Arsova, Borjana; Hallab, Asis; Gruden, Kristina; Stitt, Mark; Bolger, Marie; Usadel, Björn (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-01-09)
      Genome sequences from over 200 plant species have already been published, with this number expected to increase rapidly due to advances in sequencing technologies. Once a new genome has been assembled and the genes identified, the functional annotation of their putative translational products, proteins, using ontologies is of key importance as it places the sequencing data in a biological context. ...
    • Parasitic plant small RNA analyses unveil parasite- specific signatures of microRNA retention, loss, and gain 

      Zangishei, Zahra; Annacondia, Maria Luz; Gundlach, Heidrun; Didriksen, Alena; Bruckmüller, Julien; Salari, Hooman; Krause, Kirsten; Martinez, German (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-21)
      Parasitism is a successful life strategy that has evolved independently in several families of vascular plants. The genera Cuscuta and Orobanche represent examples of the two profoundly different groups of parasites: one parasitizing host shoots and the other infecting host roots. In this study, we sequenced and described the overall repertoire of small RNAs from Cuscuta campestris and Orobanche ...
    • The plant vampire diaries: a historic perspective on Cuscuta research 

      Hartenstein, Maleen; Albert, Markus; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-08)
      The angiosperm genus <i>Cuscuta</i> lives as an almost achlorophyllous root- and leafless holoparasite and has therefore occupied scientists for more than a century. The ‘evolution’ of <i>Cuscuta</i> research started with early studies that established the phylogenetic framework for this unusual genus. It continued to produce groundbreaking cytological, morphological, and physiological insight ...
    • Plastid located WHIRLY1 enhances the responsiveness of Arabidopsis seedlings toward abscisic acid 

      Isemer, Rena; Krause, Kirsten; Grabe, Nils; Kitahata, Nobutaka; Asami, Tadao; Krupinska, Karin (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      WHIRLY1 is a protein that can be translocated from the plastids to the nucleus, making it an ideal candidate for communicating information between these two compartments. Mutants of Arabidopsis thaliana lacking WHIRLY1 (why1) were shown to have a reduced sensitivity toward salicylic acid (SA) and abscisic acid (ABA) during germination. Germination assays in the presence of abamine, an inhibitor of ...
    • A rapid preparation procedure for laser microdissection‑mediated harvest of plant tissues for gene expression analysis 

      Olsen, Stian; Krause, Kirsten (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-08-02)
      <p><i>Background - </i>Gene expression changes that govern essential biological processes can occur at the cell-specific level. To gain insight into such events, laser microdissection is applied to cut out specific cells or tissues from which RNA for gene expression analysis is isolated. However, the preparation of plant tissue sections for laser microdissection and subsequent RNA isolation usually ...
    • Rising from the shadows: selective foraging in model shoot parasitic plants 

      Bawin, Thomas Georges A; Krause, Kirsten (Journal article; Tidsskriftartikkel, 2023-12-06)
      Despite being sessile, plants nonetheless forage for resources by modulating their growth. Adaptative foraging in response to changes in resource availability and presence of neighbours has strong implications for performance and fitness. It is an even more pressing issue for parasitic plants, which draw resources directly from other plants. Indeed, parasitic plants were demonstrated over the years ...