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  • 1. Abraham, Edit
    et al.
    Miskolczi, Pal
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Ayaydin, Ferhan
    Yu, Ping
    Kotogany, Edit
    Bako, Laszlo
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC).
    Oetvoes, Krisztina
    Horvath, Gabor V.
    Dudits, Denes
    Immunodetection of retinoblastoma-related protein and its phosphorylated form in interphase and mitotic alfalfa cells2011In: Journal of Experimental Botany, ISSN 0022-0957, E-ISSN 1460-2431, Vol. 62, no 6, p. 2155-2168Article in journal (Refereed)
    Abstract [en]

    Plant retinoblastoma-related (RBR) proteins are primarily considered as key regulators of G(1)/S phase transition, with functional roles in a variety of cellular events during plant growth and organ development. Polyclonal antibody against the C-terminal region of the Arabidopsis RBR1 protein also specifically recognizes the alfalfa 115 kDa MsRBR protein, as shown by the antigen competition assay. The MsRBR protein was detected in all cell cycle phases, with a moderate increase in samples representing G(2)/M cells. Antibody against the human phospho-pRb peptide (Ser807/811) cross-reacted with the same 115 kDa MsRBR protein and with the in vitro phosphorylated MsRBR protein C-terminal fragment. Phospho-MsRBR protein was low in G(1) cells. Its amount increased upon entry into the S phase and remained high during the G(2)/M phases. Roscovitine treatment abolished the activity of alfalfa MsCDKA1;1 and MsCDKB2;1, and the phospho-MsRBR protein level was significantly decreased in the treated cells. Colchicine block increased the detected levels of both forms of MsRBR protein. Reduced levels of the MsRBR protein in cells at stationary phase or grown in hormone-free medium can be a sign of the division-dependent presence of plant RBR proteins. Immunolocalization of the phospho-MsRBR protein indicated spots of variable number and size in the labelled interphase nuclei and high signal intensity of nuclear granules in prophase. Structures similar to phospho-MsRBR proteins cannot be recognized in later mitotic phases. Based on the presented western blot and immunolocalization data, the possible involvement of RBR proteins in G(2)/M phase regulation in plant cells is discussed.

  • 2. Cruz-Ramírez, Alfredo
    et al.
    Díaz-Triviño, Sara
    Blilou, Ikram
    Grieneisen, Verônica A.
    Sozzani, Rosangela
    Zamioudis, Christos
    Miskolczi, Pál
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå, Sweden.
    Nieuwland, Jeroen
    Benjamins, René
    Dhonukshe, Pankaj
    Caballero-Pérez, Juan
    Horvath, Beatrix
    Long, Yuchen
    Mähönen, Ari Pekka
    Zhang, Hongtao
    Xu, Jian
    Murray, James A. H.
    Benfey, Philip N.
    Bako, Laszlo
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, Umeå, Sweden.
    Marée, Athanasius F. M.
    Scheres, Ben
    A Bistable Circuit Involving SCARECROW-RETINOBLASTOMA Integrates Cues to Inform Asymmetric Stem Cell Division2012In: Cell, ISSN 0092-8674, E-ISSN 1097-4172, Vol. 150, no 5, p. 1002-1015Article in journal (Refereed)
    Abstract [en]

    In plants, where cells cannot migrate, asymmetric cell divisions (ACDs) must be confined to the appropriate spatial context. We investigate tissue-generating asymmetric divisions in a stem cell daughter within the Arabidopsis root. Spatial restriction of these divisions requires physical binding of the stem cell regulator SCARECROW (SCR) by the RETINOBLASTOM-RELATED (RBR) protein. In the stem cell niche, SCR activity is counteracted by phosphorylation of RBR through a cyclinD6;1-CDK complex. This cyclin is itself under transcriptional control of SCR and its partner SHORT ROOT (SHR), creating a robust bistable circuit with either high or low SHR-SCR complex activity. Auxin biases this circuit by promoting CYCD6;1 transcription. Mathematical modeling shows that ACDs are only switched on after integration of radial and longitudinal information, determined by SHR and auxin distribution, respectively. Coupling of cell-cycle progression to protein degradation resets the circuit, resulting in a "flip flop" that constrains asymmetric cell division to the stem cell region.

  • 3. Sečenji, M
    et al.
    Lendvai, Á
    Miskolczi, Pal
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences, Szeged, Hungary.
    Kocsy, G
    Gallé, Á
    Szűcs, A
    Hoffmann, B
    Sárvári, É
    Schweizer, P
    Stein, N
    Dudits, D
    Györgyey, J
    Differences in root functions during long-term drought adaptation: comparison of active gene sets of two wheat genotypes2010In: Plant Biology, ISSN 1435-8603, E-ISSN 1438-8677, Vol. 12, no 6, p. 871-882Article in journal (Refereed)
    Abstract [en]

    In an attempt to shed light on the role of root systems in differential responses of wheat genotypes to long-term water limitation, transcriptional differences between two wheat genotypes (Triticum aestivum L., cv. Plainsman V and landrace Kobomugi) were identified during adaptation to moderate water stress at the tillering stage. Differences in organ sizes, water-use efficiency and seed production were detected in plants grown in soil, and root functions were characterised by expression profiling. The molecular genetic background of the behaviour of the two genotypes during this stress was revealed using a cDNA macroarray for transcript profiling of the roots. During a 4-week period of moderate water deficit, a set of up-regulated genes displaying transiently increased expression was identified in young plantlets, mostly in the second week in the roots of Kobomugi, while transcript levels remained constantly high in roots of Plainsman V. These genes encode proteins with various functions, such as transport, protein metabolism, osmoprotectant biosynthesis, cell wall biogenesis and detoxification, and also regulatory proteins. Oxidoreductases, peroxidases and cell wall-related genes were induced significantly only in Plainsman V, while induction of stress- and defence-related genes was more pronounced in Kobomugi. Real-time qPCR analysis of selected members of the glutathione S-transferase gene family revealed differences in regulation of family members in the two genotypes and confirmed the macroarray results. The TaGSTZ gene was stress-activated only in the roots of Kobomugi.

  • 4.
    Stachula, Paulina
    et al.
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Dios Barajas Lopez, Juan De
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Miskolczi, Pál
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Vaultier, Marie-Noelle
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Zheng, Bo
    Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences.
    Ahad, Abdul
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Nick, Peter
    Molekulare Zellbiologie Botanisches Institut, Karlsruhe Institute of Technology, Germany.
    Bakó, László
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Strand, Åsa
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology.
    Hurry, Vaughan
    Umeå University, Faculty of Science and Technology, Department of Plant Physiology. Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences.
    CRMK1 a receptor-like kinase in the plasma membrane mediates the cold acclimation response in ArabidopsisManuscript (preprint) (Other academic)
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