Hypocotyl growth orientation in blue light is determined by phytochrome A inhibition of gravitropism and phototropin promotion of phototropism
Abstract
Summary: How developing seedlings integrate gravitropic and phototropic stimuli to determine their direction of growth is poorly understood. In this study we tested whether blue light influences hypocotyl gravitropism in Arabidopsis. Phototropin1 (phot1) triggers phototropism under low fluence rates of blue light but, at least in the dark, has no effect on gravitropism. By analyzing the growth orientation of phototropism‐deficient seedlings in response to gravitropic and phototropic stimulations we show that blue light not only triggers phototropism but also represses hypocotyl gravitropism. At low fluence rates of blue light phot1 mutants were agravitropic. In contrast, phyAphot1 double mutants grew exclusively according to gravity demonstrating that phytochrome A (phyA) is necessary to inhibit gravitropism. Analyses of phot1cry1cry2 triple mutants indicate that cryptochromes play a minor role in this response. Thus the optimal growth orientation of hypocotyls is determined by the action of phyA‐suppressing gravitropism and the phototropin‐triggering phototropism. It has long been known that phytochromes promote phototropism but the mechanism involved is still unknown. Our data show that by inhibiting gravitropism phyA acts as a positive regulator of phototropism.
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A single mutation in phot1 leads to hypocotyl-negative gravity loss under low-fluence blue light.
“A single mutation in phot1 reportedly leads to hypocotyl-negative gravity loss under low-fluence blue light.”
From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Lariguet and Fankhauser, 2004
PHYA is necessary for suppression of gravitropism in the phyA phot1 double mutant, as it develops in accordance with gravity.
“An analysis of the growth of the phyA phot1 double mutant reveals that PHYA is necessary for the suppression of gravitropism, as it develops in accordance with gravity.”
From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Lariguet and Fankhauser, 2004
Cryptochrome plays a minor role in the suppression of gravitropism in the phot1 cry1 cry2 triple mutant.
“Analysis of the phot1 cry1 cry2 triple mutant indicated that cryptochrome plays a minor role in this response”
From The action of enhancing weak light capture via phototropic growth and chloroplast movement in plants (2022) · cites this paper as Lariguet and Fankhauser, 2004
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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
“Analysis of the phot1 cry1 cry2 triple mutant indicated that cryptochrome plays a minor role in this response (Lariguet and Fankhauser, 2004).”
Background
- Authors
- Lariguet, P., & Fankhauser, C.
- Corresponding author
- Fankhauser, Christian
- Venue
- The Plant Journal
- Publisher
- Wiley
- Published
- 2004-11-17
- Volume
- 40
- Issue
- 5
- Pages
- 826-834
- ISSN
- 0960-7412 (ISSN-L)
- 1365-313X
- OpenAlex
- W2155141798
- Cited by
- 103
- References
- 51
- Citations by year
- 2026: 3 · 2025: 1 · 2024: 3 · 2023: 5 · 2022: 4 · 2021: 2 · 2020: 3 · 2019: 3 · 2018: 4 · 2017: 3 · 2016: 5 · 2015: 5 · 2014: 9 · 2013: 4 · 2012: 11
- FWCI
- 7.04
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Plant Journal (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- 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
- gravitropism, phototropism, blue light, phytochrome A, Arabidopsis thaliana, cryptochrome
- MeSH terms
- Flavoproteins, Light, Mutation, Phosphoproteins, Phytochrome, Protein Serine-Threonine Kinases, Arabidopsis, Gene Expression Regulation, Plant, Plant Roots, Plant Shoots, Gravitropism, Phototropism, Hypocotyl, Arabidopsis Proteins, Phytochrome A, Cryptochromes
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