NDLI: Chloroplast Cu/Zn-superoxide dismutase is a highly sensitive site in cucumber leaves chilled in the light

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Chloroplast Cu/Zn-superoxide dismutase is a highly sensitive site in cucumber leaves chilled in the light

Content Provider	Semantic Scholar
Author	Choi, Sun Mi Jeong, Suk Weon Jeong, Won Joong Kwon, Suk Hyung Chow, Wah Soon Park, Youn-Il
Copyright Year	2002
Abstract	Abstract. Light-chilling stress, the combination of low-light illumination and low temperature, preferentially inactivated photosystem I (PSI) of cucumber (Cucumis sativus L.) leaves, resulting in the photoinhibition of photosynthesis. The extent of PSI photoinhibition, determined in vivo by monitoring absorption changes around 810 nm (induced by far-red light), was closely correlated with the redox state of the PSII electron acceptor QA, measured as the chlorophyll fluorescence parameter, 1–qP, where qP is a photochemical quenching coefficient. In contrast, the decrease in the far-red-induced leaf absorptance signal was not well correlated with the limited fragmentation of the PsaA/B gene products in the PSI reaction center after the light-chilling stress. Amongst various enzymes involved in the photooxidative damage such as superoxide dismutase (SOD), ascorbate peroxidase, and NAD(P)H dehydrogenase, only SOD was inhibited by light-chilling treatment. Further, an approximately 3-fold increase in the leaf content of H2O2, a potent inhibitor of Cu/Zn-SOD, was observed after light-chilling stress. From these results, we suggest that Cu/Zn-SOD is the primary target of the light-chilling stress, followed by subsequent inactivation of PSI by reactive oxygen species.
Starting Page	315
Ending Page	324
Page Count	10
File Format	PDF HTM / HTML
DOI	10.1007/s00425-002-0852-z
PubMed reference number	12447546
Journal	Medline
Volume Number	216
Alternate Webpage(s)	https://page-one.springer.com/pdf/preview/10.1007/s00425-002-0852-z
Alternate Webpage(s)	https://doi.org/10.1007/s00425-002-0852-z
Journal	Planta
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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