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Cited by 326Photosynthetic Processes and MechanismsPlant biochemistry and biosynthesisLight effects on plants

The DOI matches its Crossref record; 62 of the 63 references it cites were found in a registry or an index.

Chlamydomonas Xanthophyll Cycle Mutants Identified by Video Imaging of Chlorophyll Fluorescence Quenching.

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Niyogi, K. K., Bjorkman, O., Grossman, A. R.·1997·The Plant Cell

Abstract

The photosynthetic apparatus in plants is protected against oxidative damage by processes that dissipate excess absorbed light energy as heat within the light-harvesting complexes. This dissipation of excitation energy is measured as nonphotochemical quenching of chlorophyll fluorescence. Nonphotochemical quenching depends primarily on the [delta]pH that is generated by photosynthetic electron transport, and it is also correlated with the amounts of zeaxanthin and antheraxanthin that are formed from violaxanthin by the operation of the xanthophyll cycle. To perform a genetic dissection of nonphotochemical quenching, we have isolated npq mutants of Chlamydomonas by using a digital video-imaging system. In excessive light, the npq1 mutant is unable to convert violaxanthin to antheraxanthin and zeaxanthin; this reaction is catalyzed by violaxanthin de-epoxidase. The npq2 mutant appears to be defective in zeaxanthin epoxidase activity, because it accumulates zeaxanthin and completely lacks antheraxanthin and violaxanthin under all light conditions. Characterization of these mutants demonstrates that a component of nonphotochemical quenching that develops in vivo in Chlamydomonas depends on the accumulation of zeaxanthin and antheraxanthin via the xanthophyll cycle. However, observation of substantial, rapid, [delta]pH-dependent nonphotochemical quenching in the npq1 mutant demonstrates that the formation of zeaxanthin and antheraxanthin via violaxanthin de-epoxidase activity is not required for all [delta]pH-dependent nonphotochemical quenching in this alga. Furthermore, the xanthophyll cycle is not required for survival of Chlamydomonas in excessive light.

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Metadata

Authors
Niyogi, K. K., Bjorkman, O., & Grossman, A. R.
Affiliations
  • Carnegie Institution for Science (US)
  • Carnegie Institution of Washington, Department of Plant Biology, 290 Panama Street, Stanford, California 94305.
Venue
The Plant Cell
Published
1997-08-01
Volume
9
Issue
8
Pages
1369-1380
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W1987833932
Cited by
326
References
63
Citations by year
2025: 6 · 2024: 8 · 2023: 7 · 2022: 6 · 2021: 11 · 2020: 14 · 2019: 7 · 2018: 9 · 2017: 8 · 2016: 17 · 2015: 13 · 2014: 14 · 2013: 16 · 2012: 10
FWCI
3.68
Type
journal article
Language
en
Open access
Locations
  • The Plant Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Plant biochemistry and biosynthesis
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
Keywords
Chlamydomonas, xanthophyll cycle, non-photochemical quenching, violaxanthin de-epoxidase, zeaxanthin epoxidase, violaxanthin, antheraxanthin, zeaxanthin, chlorophyll fluorescence quenching, video imaging, photosynthetic electron transport, pH gradient, photoprotection

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CoChat. (2026). Citation check: Chlamydomonas Xanthophyll Cycle Mutants Identified by Video Imaging of Chlorophyll Fluorescence Quenching. https://app.cochat.ai/papers/10.1105/tpc.9.8.1369
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Niyogi, K. K., Bjorkman, O., & Grossman, A. R. (1997). Chlamydomonas Xanthophyll Cycle Mutants Identified by Video Imaging of Chlorophyll Fluorescence Quenching. The Plant Cell. https://doi.org/10.1105/tpc.9.8.1369

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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