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The major photoprotective role of anthocyanins in leaves of Arabidopsis thaliana under long-term high light treatment: antioxidant or light attenuator?
- Source :
- Photosynthesis Research. 149:25-40
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- Anthocyanins are water-soluble pigments in plants known for their photoprotective role against photoinhibitory and photooxidative damage under high light (HL). However, it remains unclear whether light-shielding or antioxidant activity plays a major role in the photoprotection exerted by anthocyanins under HL stress. To shed light on this question, we analyzed the physiological and biochemical responses to HL of three Arabidopsis thaliana lines (Col, chi, ans) with different light absorption and antioxidant characteristics. Under HL, ans had the highest antioxidant capacity, followed by Col, and finally chi; Col had the strongest light attenuation capacity, followed by chi, and finally ans. The line ans had weaker physiological activity of chloroplasts and more severe oxidative damage than chi after HL treatment. Col with highest photoprotection of light absorption capacity had highest resistance to HL among the three lines. The line ans with high antioxidant capacity could not compensate for its disadvantages in HL caused by the absence of the light-shielding function of anthocyanins. In addition, the expression level of the Anthocyanin Synthase (ANS) gene was most upregulated after HL treatment, suggesting that the conversion of colorless into colored anthocyanin precursors was necessary under HL. The contribution of anthocyanins to flavonoids, phenols, and antioxidant capacity increased in the late period of HL, suggesting that plants prefer to synthesize red anthocyanins (a group of colored antioxidants) over other colorless antioxidants to cope with HL. These experimental observations indicate that the light attenuation role of anthocyanins is more important than their antioxidant role in photoprotection.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Antioxidant
Genotype
medicine.medical_treatment
Arabidopsis
Plant Science
Genes, Plant
01 natural sciences
Biochemistry
Anthocyanins
03 medical and health sciences
chemistry.chemical_compound
Pigment
Radiation Protection
Gene Expression Regulation, Plant
medicine
Arabidopsis thaliana
Phenols
Photosynthesis
biology
Adaptation, Ocular
fungi
Genetic Variation
food and beverages
Plant physiology
Cell Biology
General Medicine
biology.organism_classification
Plant Leaves
carbohydrates (lipids)
Chloroplast
Oxidative Stress
Phenotype
030104 developmental biology
chemistry
Photoprotection
Anthocyanin
visual_art
Mutation
Sunlight
visual_art.visual_art_medium
010606 plant biology & botany
Subjects
Details
- ISSN :
- 15735079 and 01668595
- Volume :
- 149
- Database :
- OpenAIRE
- Journal :
- Photosynthesis Research
- Accession number :
- edsair.doi.dedup.....89d1ac961effb92d7b50836155af8618