Regulation of xanthophyll cycle pool size in response to high light irradiance in <i>Arabidopsis</i>
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- Kawabata Yuiko
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University
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- Takeda Satomi
- Department of Biological Science, Graduate School of Science, Osaka Prefecture University
Bibliographic Information
- Other Title
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- Regulation of xanthophyll cycle pool size in response to high light irradiance in Arabidopsis
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Abstract
The xanthophyll cycle is known to play a key photoprotective role in plants. While it has been demonstrated that the pool size of xanthophyll cycle pigments (VAZ) increases during acclimation to high light (HL) intensity, the associated regulatory mechanism remains largely unknown. Since the redox state of Plastoquinone (PQ) is thought to influence the expression of photosynthesis-related genes, we addressed the possibility that the redox state of PQ affects the regulation of carotenoid synthesis. To do this, we used a photoautotrophic cell culture of Arabidopsis, that can grow stably in sugar-free medium, and regulated the redox state by adding the electron transport inhibitors, DCMU or 2,5-dibromo-3-methyl-6-isopropyl benzoquinone (DBMIB) to the cells. We then analyzed their effects on VAZ accumulation and the expression of genes encoding carotenoid biosynthesis enzymes. The VAZ pool size and the transcript levels of β-carotene hydroxylase genes (Chy1, Chy2, CYP97A3 [Lut5]) were higher under HL than under normal conditions; however, DCMU treatment partially blocked these effects. In contrast, DBMIB treatment increased VAZ accumulation and transcription of these genes without HL irradiation to a certain extent. Based on these results, we propose that the redox state of PQ is one of the regulator of the pool size of VAZ. The expression of LcyB encoding lycopene β-cyclase was also clearly up-regulated by HL, but not affected by PQ redox. In addition, using mutants of the β-carotene hydroxylase genes, we identified Chy1 as the gene that contributed most to the increase in VAZ pool size by HL.
Journal
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- Plant Biotechnology
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Plant Biotechnology 31 (3), 229-240, 2014
Japanese Society for Plant Biotechnology
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Details 詳細情報について
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- CRID
- 1390001204327190272
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- NII Article ID
- 130004677758
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- NII Book ID
- AA11250821
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- ISSN
- 13476114
- 13424580
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- NDL BIB ID
- 025818924
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed