Journal
BIOLOGIA PLANTARUM
Volume 56, Issue 1, Pages 97-104Publisher
SPRINGER
DOI: 10.1007/s10535-012-0022-5
Keywords
chlorophyll fluorescence imaging; hydrogen peroxide; membrane leakage; mutant; superoxide radical
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Funding
- National Natural Science Foundation of China [30770173, 30870385]
- State Key Basic Research and Development Plan of China (973 Program) [2009CB118504]
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To uncover the potential antioxidative role of anthocyanins in vivo in protecting photosynthetic tissues from photoinhibition, the effects of high irradiance [HI, 1300 mu mol(photon) m(-2) s(-1)] were studied using detached leaves derived from Arabidopsis wild-type (WT) and the mutant deficient in anthocyanin biosynthesis (tt3tt4). HI stress caused decreased chlorophyll content and photochemical efficiency, but increased cell-membrane leakage and contents of hydrogen peroxide and superoxide radical in the leaves of both Arabidopsis phenotypes, but the WT plants showed better HI tolerance than tt3tt4 mutant. HI caused a significant increase in the 1,1-diphenyl-2-picrylhydrazyl scavenging capacity in WT but not in the tt3tt4 mutant. The anthocyanins could not contribute substantially to light-shielding during the periods of HI stress, because the anthocyanin content in WT was very low and the colour of leaves was the same as in the tt3tt4 mutant. Thus, it was assumed that the better HI tolerance in WT was mostly related to the potential antioxidative role of anthocyanins.
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