The regulatory landscape of a core maize domestication module controlling bud dormancy and growth repression

Zhaobin Dong, Yuguo Xiao, Rajanikanth Govindarajulu, Regina Feil, Muriel L. Siddoway, Torrey Nielsen, John E. Lunn, Jennifer Hawkins, Clinton Whipple () and George Chuck ()
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Zhaobin Dong: University of California, Berkeley
Yuguo Xiao: Brigham Young University
Rajanikanth Govindarajulu: West Virginia University
Regina Feil: Max Planck Institute of Molecular Plant Physiology, Muehlenberg
Muriel L. Siddoway: Brigham Young University
Torrey Nielsen: Brigham Young University
John E. Lunn: Max Planck Institute of Molecular Plant Physiology, Muehlenberg
Jennifer Hawkins: West Virginia University
Clinton Whipple: Brigham Young University
George Chuck: University of California, Berkeley

Nature Communications, 2019, vol. 10, issue 1, 1-15

Abstract: Abstract Many domesticated crop plants have been bred for increased apical dominance, displaying greatly reduced axillary branching compared to their wild ancestors. In maize, this was achieved through selection for a gain-of-function allele of the TCP transcription factor teosinte branched1 (tb1). The mechanism for how a dominant Tb1 allele increased apical dominance, is unknown. Through ChIP seq, RNA seq, hormone and sugar measurements on 1 mm axillary bud tissue, we identify the genetic pathways putatively regulated by TB1. These include pathways regulating phytohormones such as gibberellins, abscisic acid and jasmonic acid, but surprisingly, not auxin. In addition, metabolites involved in sugar sensing such as trehalose 6-phosphate were increased. This suggests that TB1 induces bud suppression through the production of inhibitory phytohormones and by reducing sugar levels and energy balance. Interestingly, TB1 also putatively targets several other domestication loci, including teosinte glume architecture1, prol1.1/grassy tillers1, as well as itself. This places tb1 on top of the domestication hierarchy, demonstrating its critical importance during the domestication of maize from teosinte.

Date: 2019
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DOI: 10.1038/s41467-019-11774-w

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