Author ORCID Identifier
https://orcid.org/0000-0002-1275-581X
https://orcid.org/0000-0002-0747-5856
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https://orcid.org/0000-0001-8533-3004
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https://orcid.org/0000-0001-7879-235X
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Document Type
Article
Publication Date
2019
Department/Program/Center
Biology
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.
Digital Commons Citation
Dong, Zhaobin; Xiao, Yuguo; Govindarajulu, Rajanikanth; Feil, Regina; Siddoway, Muriel L.; Nielsen, Torrey; Lunn, John E.; Hawkins, Jennifer; Whipple, Clinton; and Chuck, George, "The Regulatory Landscape of a Core Maize Domestication Module Controlling Bud Dormancy and Growth Repression" (2019). Faculty & Staff Scholarship. 1845.
https://researchrepository.wvu.edu/faculty_publications/1845
Source Citation
Dong, Z., Xiao, Y., Govindarajulu, R., Feil, R., Siddoway, M. L., Nielsen, T., … Chuck, G. (2019). The regulatory landscape of a core maize domestication module controlling bud dormancy and growth repression. Nature Communications, 10(1). https://doi.org/10.1038/s41467-019-11774-w
Comments
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