Characterization of synthetic ecdysteroid analogues as functional mimics of brassinosteroids in plant growth
Open accessAbstract
Brassinosteroids (BRs) are plant steroidal hormones that play important roles in many stages of plant growth. Several plant species produce ecdysteroids, which are known as insect molting steroid hormones. In this study, we evaluated the biological activities of three hydroxysteroidal compounds, 20-hydroxyecdysone (ECD), 7,8-dihydro-8α-20-hydroxyecdysone (DHECD), and 7,8-dihydro-5α,8α-20-hydroxyecdysone (α-DHECD), and compared their activities with that of brassinolide (BL), the most potent BR. In rice, DHECD and α-DHECD enhanced the degree of lamina inclination, as do BRs. In Arabidopsis thaliana, DHECD and α-DHECD increased hypocotyl length in the wild-type, and also partially overcame the hypocotyl shortening in the wild-type caused by 0.3μM brassinazole, a specific BR biosynthesis inhibitor. DHECD and α-DHECD partially reduced dwarfism in the BR-biosynthesis-deficient mutant det2. Treatment with DHECD or α-DHECD downregulated the expression of the BR biosynthesis genes DWF4 and CPD, which are generally, suppressed by BR, and upregulated the expression of TCH4 and SAUR-AC1, which are generally promoted by BR. However, their regulated activities were less effective than BL. Moreover, the 10-4 M DHECD and α-DHECD induced the accumulation of dephosphorylated BIL1/BZR1 that enhanced BR signaling as a master transcription factor. In contrast, ECD did not affect rice lamina bending, Arabidopsis hypocotyl elongation, the expression levels of BR-related genes and BIL1/BZR1 phosphorylation status. Based on these results, we hypothesize that both DHECD and α-DHECD have functional activities similar to those of BR.
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Synthetic ecdysteroid analogues that possess some brassinosteroid-like activity have been prepared.
“However, synthetic ecdysteroid analogues that possess some brassinosteroid-like activity have been prepared [103].”
From Ecdysteroids (2021) · cites this paper as [103]
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- Authors
- Thussagunpanit, J., Jutamanee, K., Homvisasevongsa, S., Suksamrarn, A., Yamagami, A., Nakano, T., & Asami, T.
- Affiliations
- Kasetsart University (TH)
- Huachiew Chalermprakiet University (TH)
- Ramkhamhaeng University (TH)
- RIKEN (JP)
- Japan Science and Technology Agency (JP)
- King Abdulaziz University (SA)
- Corresponding author
- Asami, Tadao
- ORCID
- Venue
- The Journal of Steroid Biochemistry and Molecular Biology
- Publisher
- Elsevier BV
- Published
- 2017-09
- Volume
- 172
- Pages
- 1-8
- ISSN
- 0960-0760 (ISSN-L)
- OpenAlex
- W2610879653
- Cited by
- 15
- References
- 60
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2022: 2 · 2021: 2 · 2020: 2 · 2019: 2 · 2018: 4
- FWCI
- 2.15
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The Journal of Steroid Biochemistry and Molecular Biology (acceptedVersion)
- PubMed (publishedVersion)
- Funders
- Development and Promotion of Science and Technology Talents Project
- Institute for the Promotion of Teaching Science and Technology
- Core Research for Evolutional Science and Technology (CREST), Japan
- Thailand Research Fund (RDG5490011)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Growth Enhancement Techniques
- Keywords
- brassinosteroids, ecdysteroids, 20-hydroxyecdysone, brassinolide, brassinosteroid biosynthesis, brassinosteroid signaling, DWF4, CPD, hypocotyl elongation, brassinazole, rice, Arabidopsis thaliana, plant growth regulators
- MeSH terms
- Cytochrome P-450 Enzyme System, DNA-Binding Proteins, Ecdysterone, Nuclear Proteins, Phosphorylation, Plant Growth Regulators, Oryza, Seeds, Steroid Hydroxylases, Steroids, Heterocyclic, Triazoles, Signal Transduction, Glycosyltransferases, Arabidopsis, Gene Expression Regulation, Plant, Gene Expression Regulation, Developmental, Hypocotyl, Arabidopsis Proteins, Biomimetic Materials, Brassinosteroids, Real-Time Polymerase Chain Reaction
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