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  • 1
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    ARR1, a transcription factor for genes immediately responsive to cytokinins (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-11-03
    Description: Cytokinins are a class of phytohormones involved in various physiological events of plants. The Arabidopsis sensor histidine kinase CRE1 was recently reported to be a cytokinin receptor. We used a steroid-inducible system to show that the transcription factor-type response regulator ARR1 directs transcriptional activation of the ARR6 gene, which responds to cytokinins without de novo protein synthesis. This fact, together with characteristics of ARR1-overexpressing plants and arr1 mutant plants, indicates that the phosphorelay to ARR1, probably from CRE1, constitutes an intracellular signal transduction occurring immediately after cytokinin perception.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sakai, H -- Honma, T -- Aoyama, T -- Sato, S -- Kato, T -- Tabata, S -- Oka, A -- New York, N.Y. -- Science. 2001 Nov 16;294(5546):1519-21. Epub 2001 Nov 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Biology, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11691951" target="_blank"〉PubMed〈/a〉
    Keywords: Adenine/*analogs & derivatives/*metabolism/pharmacology ; Arabidopsis/cytology/*genetics/growth & development/metabolism ; *Arabidopsis Proteins ; Blotting, Northern ; Cell Division/drug effects ; Cycloheximide/pharmacology ; Cytokinins/*metabolism/pharmacology ; DNA-Binding Proteins/*metabolism ; Dexamethasone/pharmacology ; Gene Expression Regulation, Plant ; *Genes, Plant ; Kinetin ; Phenotype ; Plant Proteins/metabolism ; Plant Roots/drug effects/growth & development ; Plant Shoots/drug effects/growth & development ; Plants, Genetically Modified ; Protein Kinases/metabolism ; Protein Synthesis Inhibitors/pharmacology ; Receptors, Cell Surface/metabolism ; Signal Transduction ; Transcription Factors/*metabolism ; *Transcriptional Activation
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Cytokinin signaling and its inhibitor AHP6 regulate cell fate during vascular development (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-01-10
    Description: The cell lineages that form the transporting tissues (xylem and phloem) and the intervening pluripotent procambial tissue originate from stem cells near the root tip. We demonstrate that in Arabidopsis, cytokinin phytohormones negatively regulate protoxylem specification. AHP6, an inhibitory pseudophosphotransfer protein, counteracts cytokinin signaling, allowing protoxylem formation. Conversely, cytokinin signaling negatively regulates the spatial domain of AHP6 expression. Thus, by controlling the identity of cell lineages, the reciprocal interaction of cytokinin signaling and its spatially specific modulator regulates proliferation and differentiation of cell lineages during vascular development, demonstrating a previously unrecognized regulatory circuit underlying meristem organization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mahonen, Ari Pekka -- Bishopp, Anthony -- Higuchi, Masayuki -- Nieminen, Kaisa M -- Kinoshita, Kaori -- Tormakangas, Kirsi -- Ikeda, Yoshihisa -- Oka, Atsuhiro -- Kakimoto, Tatsuo -- Helariutta, Yka -- New York, N.Y. -- Science. 2006 Jan 6;311(5757):94-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plant Molecular Biology Laboratory, Institute of Biotechnology, POB 56, FI-00014, University of Helsinki, Finland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16400151" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Alleles ; Arabidopsis/*cytology/genetics/growth & development/*metabolism ; Arabidopsis Proteins/genetics/*metabolism/physiology ; Cell Differentiation ; Cell Division ; Cell Lineage ; Cloning, Molecular ; Cytokinins/*metabolism ; Genes, Plant ; Kinetin/metabolism/pharmacology ; Meristem/cytology/growth & development/metabolism ; Morphogenesis ; Phenotype ; Phosphorylation ; Plant Growth Regulators/*metabolism ; Plant Roots/*cytology/growth & development/metabolism ; Plant Shoots/metabolism ; Plants, Genetically Modified ; *Signal Transduction ; Suppression, Genetic ; Zeatin/metabolism/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Modulation of phospholipid signaling by GLABRA2 in root-hair pattern formation (2003)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2003-05-31
    Description: The root-hair pattern of Arabidopsis is determined through a regulatory circuit composed of transcription factor genes. The homeobox gene GLABRA2 (GL2) has been considered a key component, acting farthest downstream in this regulation. GL2 modified to include a transactivating function caused epidermal cells to develop ectopic root hairs or root hair-like structures. With this system, the phospholipase Dzeta1 gene (AtPLDzeta1) was identified as a direct target of GL2. Inducible expression of AtPLDzeta1 promoted ectopic root-hair initiation. We conclude that GL2 exerts its regulatory effect on root-hair development through modulation of phospholipid signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ohashi, Yohei -- Oka, Atsuhiro -- Rodrigues-Pousada, Renato -- Possenti, Marco -- Ruberti, Ida -- Morelli, Giorgio -- Aoyama, Takashi -- New York, N.Y. -- Science. 2003 May 30;300(5624):1427-30.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12775839" target="_blank"〉PubMed〈/a〉
    Keywords: Arabidopsis/*genetics/growth & development/*metabolism ; Arabidopsis Proteins/chemistry/*genetics/*metabolism ; Dexamethasone/pharmacology ; Gene Expression Regulation, Plant ; Genes, Plant ; Homeodomain Proteins/chemistry/genetics/*metabolism ; Morphogenesis ; Phospholipase D/*genetics/metabolism ; Phospholipids/*metabolism ; Plant Epidermis/cytology/metabolism ; Plant Roots/cytology/*growth & development/metabolism ; Plants, Genetically Modified ; Promoter Regions, Genetic ; *Signal Transduction
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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