Cited by 279Light effects on plantsPlant Molecular Biology ResearchPhotosynthetic Processes and Mechanisms

Phototropins Promote Plant Growth in Response to Blue Light in Low Light Environments

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Takemiya, Atsushi, Inoue, Shin-ichiro, Doi, Michio, Kinoshita, Toshinori, Shimazaki, Ken-ichiro·2005·The Plant Cell

Abstract

Phototropins (phot1 and phot2) are plant-specific blue light receptors for phototropism, chloroplast movement, leaf expansion, and stomatal opening. All these responses are thought to optimize photosynthesis by helping to capture light energy efficiently, reduce photodamage, and acquire CO2. However, experimental evidence for the promotion of plant growth through phototropins is lacking. Here, we report dramatic phototropin-dependent effects on plant growth. When plants of Arabidopsis thaliana wild type, the phot1 and phot2 mutants, and the phot1 phot2 double mutant were grown under red light, no significant growth differences were observed. However, if a very low intensity of blue light (0.1 μmol m−2 s−1) was superimposed on red light, large increases in fresh weight up to threefold were found in those plants that carried functional PHOT1 genes. When the intensity of blue light was increased to 1 μmol m−2 s−1, the growth enhancement was also found in the phot1 single mutant, but not in the double mutant, indicating that phot2 mediated similar responses as phot1 with a lower sensitivity. The effects occurred under low photosynthetically active radiation in particular. The well-known physiological phototropin-mediated responses, including chloroplast movement, stomatal opening, and leaf expansion, in the different lines tested indicated an involvement of these responses in the blue light–induced growth enhancement. We conclude that phototropins promote plant growth by controlling and integrating a variety of responses that optimize photosynthetic performance under low photosynthetically active radiation in the natural environment.

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Crossref · 10.1105/tpc.104.030049

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  • Phototropism allows plants to orient their photosynthetic organs toward the light and occurs in mosses, ferns, and angiosperms.

    “Phototropism allows plants to orient their photosynthetic organs toward the light and this behavior also occurs in mosses, ferns, and angiosperms (Takemiya et al. 2005; Suetsugu and Wada, 2007b; Goyal et al. 2013; Hohm et al. 2013; Briggs, 2014).”
  • Under weak light conditions, the phot1 mutant exhibits reduced photosynthetic performance and growth by reducing chloroplast accumulation, weakening stomatal opening, and causing leaf curling.

    “Under weak light conditions, phot1 mutant exhibit reduced photosynthetic performance and growth by reducing chloroplast accumulation, weakening stomatal opening, and causing leaf curling”

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Authors
Takemiya, A., Inoue, S.-I., Doi, M., Kinoshita, T., & Shimazaki, K.-I.
Affiliations
Kyushu University (JP)
Venue
The Plant Cell
Published
2005-04-01
Volume
17
Issue
4
Pages
1120-1127
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2130280374
Cited by
279
References
36
Citations by year
2026: 13 · 2025: 13 · 2024: 13 · 2023: 16 · 2022: 15 · 2021: 21 · 2020: 15 · 2019: 15 · 2018: 17 · 2017: 15 · 2016: 12 · 2015: 10 · 2014: 10 · 2013: 16 · 2012: 14
FWCI
13.99
Type
journal article
Language
en
Open access
Locations
  • The Plant Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion)
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 › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
Keywords
phototropin, phot1, phot2, blue light, low-light conditions, plant growth, photosynthetically active radiation, phototropism, chloroplast movement, stomatal opening, leaf expansion, Arabidopsis thaliana, photomorphogenesis
MeSH terms
Acclimatization, Light, Mutation, Phosphoproteins, Photosynthesis, Protein Serine-Threonine Kinases, Arabidopsis, Gene Expression Regulation, Plant, Plant Leaves, Arabidopsis Proteins

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