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

Naser Poursarebani (), Corinna Trautewig, Michael Melzer, Thomas Nussbaumer, Udda Lundqvist, Twan Rutten, Thomas Schmutzer, Ronny Brandt, Axel Himmelbach, Lothar Altschmied, Ravi Koppolu, Helmy M. Youssef, Richard Sibout, Marion Dalmais, Abdelhafid Bendahmane, Nils Stein, Zhanguo Xin and Thorsten Schnurbusch ()
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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
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
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
Richard Sibout: Université Paris-Saclay
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

Nature Communications, 2020, vol. 11, issue 1, 1-16

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-18890-y

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