Cryptochrome‐mediated hypocotyl phototropism was regulated antagonistically by gibberellic acid and sucrose in Arabidopsis
Open accessAbstract
Both phototropins (phot1 and phot2) and cryptochromes (cry1 and cry2) were proven as the Arabidopsis thaliana blue light receptors. Phototropins predominately function in photomovement, and cryptochromes play a role in photomorphogenesis. Although cryptochromes have been proposed to serve as positive modulators of phototropic responses, the underlying mechanism remains unknown. Here, we report that depleting sucrose from the medium or adding gibberellic acids (GAs) can partially restore the defects in phototropic curvature of the phot1 phot2 double mutants under high‐intensity blue light; this restoration does not occur in phot1 phot2 cry1 cry2 quadruple mutants and nph3 ( n on p hototropic h ypocotyl 3) mutants which were impaired phototropic response in sucrose‐containing medium. These results indicate that GAs and sucrose antagonistically regulate hypocotyl phototropism in a cryptochromes dependent manner, but it showed a crosstalk with phototropin signaling on NPH3. Furthermore, cryptochromes activation by blue light inhibit GAs synthesis, thus stabilizing DELLAs to block hypocotyl growth, which result in the higher GAs content in the shade side than the lit side of hypocotyl to support the asymmetric growth of hypocotyl. Through modulation of the abundance of DELLAs by sucrose depletion or added GAs, it revealed that cryptochromes have a function in mediating phototropic curvature.
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Mutating both phytochromes and cryptochromes in Arabidopsis resulted in severe phototropism loss, suggesting that, in addition to phototropin, phytochromes and cryptochromes are involved in regulating phototropism in plants.
“Mutating both phytochromes and cryptochromes in Arabidopsis resulted in severe phototropism loss (Ohgishi et al., 2004; Tsuchida-Mayama et al., 2010; Zhao et al., 2020), suggesting that, in addition to phototropin, phytochromes and cryptochromes are involved in regulating phototropism in plants.”
From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Zhao et al., 2020
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The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants
Xin, G.-Y., Li, L.-P., Wang, P.-T., Li, X.-Y., Han, Y.-J., & Zhao, X. (2022) · Stress Biology · doi:10.1007/s44154-022-00066-x · Cited by 17 · see citing works
“Mutating both phytochromes and cryptochromes in Arabidopsis resulted in severe phototropism loss (Ohgishi et al., 2004; Tsuchida-Mayama et al., 2010; Zhao et al., 2020), suggesting that, in addition to phototropin, phytochromes and cryptochromes are involved in regulating phototropism in plants.”
BackgroundSelf-citationWang, J., Liang, Y.-P., Zhu, J.-D., Wang, Y.-X., Yang, M.-Y., Yan, H.-R., Lv, Q.-Y., Cheng, K., Zhao, X., & Zhang, X. (2021) · Frontiers in Plant Science · doi:10.3389/fpls.2021.704618 · Cited by 15 · see citing works
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- Authors
- Zhao, Q., Zhu, J., Li, N., Wang, X., Zhao, X., & Zhang, X.
- Affiliations
- Henan University (CN)
- Key laboratory of Plant Stress Biology State Key Laboratory of Cotton Biology School of Life Sciences Henan University Kaifeng 475004 China
- Corresponding author
- Zhao, Xiang
- Zhang, Xiao
- Venue
- Journal of Integrative Plant Biology
- Publisher
- Wiley
- Published
- 2019-05-24
- Volume
- 62
- Issue
- 5
- Pages
- 614-630
- ISSN
- 0577-7496 (ISSN-L)
- 1672-9072
- 1744-7909
- PMC
- PMC7318699
- OpenAlex
- W2931123104
- Cited by
- 28
- References
- 79
- Citations by year
- 2026: 3 · 2025: 4 · 2024: 4 · 2023: 2 · 2022: 4 · 2021: 6 · 2020: 5
- FWCI
- 2.76
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Integrative Plant Biology (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (31670289, 31570294)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Parasitism and Resistance
- Keywords
- cryptochrome, gibberellin, sucrose, phototropin, NPH3, DELLA, blue light signaling, photomorphogenesis, photomovement, signaling crosstalk, Arabidopsis thaliana
- MeSH terms
- Protein Serine-Threonine Kinases, Arabidopsis, Phototropism, Hypocotyl, Arabidopsis Proteins, Cryptochromes, Phototropins
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