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Interactions between brassinosteroids and gibberellins: synthesis or signaling?
Plants contain three major growth-promoting plant hormones: auxin, gibberellins (GAs), and brassinosteroids (BRs), although other hormones also promote growth in certain circumstances. Possible interactions between the major three growth hormones have received much attention over the decades. In 2012, three articles proposed that the BRs and GAs can interact at the signaling level (Bai et al., 2012; Gallego-Bartolome et al., 2012; Li et al., 2012), and since then, this has become an accepted model (Figure 1; Oh et al., 2014; Wang et al., 2014; Davie're and Achard, 2016). This “signaling” model posits that DELLA proteins, which are negative regulators of GA signaling that are degraded by bioactive GA, physically interact with positive regulators of the BR response, BZR1 proteins (Bai et al., 2012; Gallego- Bartolome et al., 2012; Li et al., 2012). The DELLA-BZR1 interaction interferes with the function of BZR1 proteins, thereby reducing growth.
Funding
Australian Research Council
History
Publication title
Plant CellVolume
28Issue
4Pagination
829-832ISSN
1040-4651Department/School
School of Natural SciencesPublisher
Amer Soc Plant BiologistsPlace of publication
15501 Monona Drive, Rockville, USA, Md, 20855Repository Status
- Restricted