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Hydroxy‐plastochromanol and plastoquinone‐ C as singlet oxygen products during photo‐oxidative stress in A rabidopsis
Author(s) -
SZYMAŃSKA RENATA,
NOWICKA BEATRYCZE,
KRUK JERZY
Publication year - 2014
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12253
Subject(s) - plastoquinone , singlet oxygen , photochemistry , photosystem ii , chemistry , oxygen , oxidative stress , photosynthesis , organic chemistry , thylakoid , biochemistry , chloroplast , gene
In the present study, we have shown that hydroxy‐plastochromanol and plastoquinone‐ C , the hydroxy derivatives of plastochromanol and plastoquinone‐9, respectively, are specifically formed from the parent compounds upon action of singlet oxygen and can be regarded as stable, specific, natural products of singlet oxygen action during photo‐oxidative stress in vivo . The presented data indicate that plastoquinone‐ C formation dominates mainly during relatively short periods of high light stress where efficient production of singlet oxygen takes place, whereas hydroxy‐plastochromanol is rather formed under conditions of long‐term, less pronounced generation of singlet oxygen. An interesting observation was that hydroxy‐plastochromanol is formed even at very low light conditions (5–10 μ mol photons m −2 s −1 ), indicating that singlet oxygen is generated not only during high light stress but also its formation by photosystem II is inseparably connected with the functioning of this photosystem even at the lowest light intensities.