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Ding N, Qin Q, Wu X, Miller R, Zaitlin D, Li D, Yang S. Antagonistic regulation of axillary bud outgrowth by the BRANCHED genes in tobacco. Plant Mol Biol 2020; 103:185-196. [PMID: 32124178 DOI: 10.1007/s11103-020-00983-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 02/20/2020] [Indexed: 06/10/2023]
Abstract
As a key integrator of shoot branching, BRANCHED 1 (BRC1) coordinates and is orchestrated by endogenous and environmental signals involved in the regulation of axillary bud outgrowth. In the present study, we characterized the regulatory roles of five BRC gene members in tobacco (Nicotiana tabacum L.) using CRISPR site-directed mutagenesis and overexpression assays. It was shown that lateral branching was negatively regulated by NtBRC1A-1, 1B-1, and 1B-2, but was unexpectedly promoted by NtBRC2A. Suppression of bud growth may be attained by direct binding of NtBRCs to the Tassels Replace Upper Ears 1 (TRU1) genes. It was speculated that NtBRC2A probably confers a dominant negative effect by interfering with the branching-inhibitory BRC1 genes. Our results suggested that highly homologous gene family members may function antagonistically in the same signaling pathway. However, the molecular mechanism underlying NtBRC2A-mediated outgrowth of axillary buds needs to be further addressed. KEY MESSAGE: Axillary bud outgrowth in general is negatively regulated by the BRANCHED gene. Here we show that the BRANCHED genes play opposing regulatory roles in tobacco lateral branching.
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Affiliation(s)
- Na Ding
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - Qiulin Qin
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - Xia Wu
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - Robert Miller
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA
| | - David Zaitlin
- Kentucky Tobacco Research & Development Center, University of Kentucky, Lexington, KY, 40546, USA
| | - Dandan Li
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA
- Department of Plant Pathology, North Dakota State University, Fargo, ND, 58102, USA
| | - Shengming Yang
- Department of Plant & Soil Sciences, University of Kentucky, Lexington, KY, 40546, USA.
- USDA-ARS Cereals Research Unit, Edward T. Schafer Agriculture Research Center, Fargo, ND, 58102, USA.
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