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COMPOSITUM 1 contributes to the architectural simplification of barley inflorescence via meristem identity signals

Author

Listed:
  • Naser Poursarebani

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Corinna Trautewig

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Michael Melzer

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Thomas Nussbaumer

    (Technical University of Munich and Helmholtz Center Munich, Institute of Environmental Medicine
    Helmholtz Zentrum München (HMGU), German Research Center for Environmental Health, Institute of Network Biology (INET))

  • Udda Lundqvist

    (Nordic Genetic Resource Center (NordGen))

  • Twan Rutten

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Thomas Schmutzer

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr
    Martin Luther University Halle-Wittenberg, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences)

  • Ronny Brandt

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Axel Himmelbach

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Lothar Altschmied

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Ravi Koppolu

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Helmy M. Youssef

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr
    Martin Luther University Halle-Wittenberg, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences
    Cairo University)

  • Richard Sibout

    (Université Paris-Saclay
    INRAE, UR BIA)

  • Marion Dalmais

    (Universite Paris-Saclay)

  • Abdelhafid Bendahmane

    (Universite Paris-Saclay)

  • Nils Stein

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr)

  • Zhanguo Xin

    (USDA-ARS, Plant Stress and Germplasm Development Unit, Cropping Systems Research Laboratory)

  • Thorsten Schnurbusch

    (Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Corrensstr
    Martin Luther University Halle-Wittenberg, Faculty of Natural Sciences III, Institute of Agricultural and Nutritional Sciences)

Abstract

Grasses have varying inflorescence shapes; however, little is known about the genetic mechanisms specifying such shapes among tribes. Here, we identify the grass-specific TCP transcription factor COMPOSITUM 1 (COM1) expressing in inflorescence meristematic boundaries of different grasses. COM1 specifies branch-inhibition in barley (Triticeae) versus branch-formation in non-Triticeae grasses. Analyses of cell size, cell walls and transcripts reveal barley COM1 regulates cell growth, thereby affecting cell wall properties and signaling specifically in meristematic boundaries to establish identity of adjacent meristems. COM1 acts upstream of the boundary gene Liguleless1 and confers meristem identity partially independent of the COM2 pathway. Furthermore, COM1 is subject to purifying natural selection, thereby contributing to specification of the spike inflorescence shape. This meristem identity pathway has conceptual implications for both inflorescence evolution and molecular breeding in Triticeae.

Suggested Citation

  • Naser Poursarebani & Corinna Trautewig & Michael Melzer & Thomas Nussbaumer & Udda Lundqvist & Twan Rutten & Thomas Schmutzer & Ronny Brandt & Axel Himmelbach & Lothar Altschmied & Ravi Koppolu & Helm, 2020. "COMPOSITUM 1 contributes to the architectural simplification of barley inflorescence via meristem identity signals," Nature Communications, Nature, vol. 11(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18890-y
    DOI: 10.1038/s41467-020-18890-y
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