کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1942453 | 1052614 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Singlet oxygen and non-photochemical quenching contribute to oxidation of the plastoquinone-pool under high light stress in Arabidopsis Singlet oxygen and non-photochemical quenching contribute to oxidation of the plastoquinone-pool under high light stress in Arabidopsis](/preview/png/1942453.png)
The redox state of plastoquinone-pool in chloroplasts is crucial for driving many responses to variable environment, from short-term effects to those at the gene expression level. In the present studies, we showed for the first time that the plastoquinone-pool undergoes relatively fast oxidation during high light stress of low light-grown Arabidopsis plants. This oxidation was not caused by photoinhibition of photosystem II, but mainly by singlet oxygen generated in photosystem II and non-photochemical quenching in light harvesting complex antenna of the photosystem, as revealed in experiments with a singlet oxygen scavenger and with Arabidopsis npq4 mutant. The latter mechanism suppresses the influx of electrons to the plastoquinone-pool preventing its excessive reduction. The obtained results are of crucial importance in light of the function of the redox state of the plastoquinone-pool in triggering many high light-stimulated physiological responses of plants.
► Plastoquinone-pool undergoes fast oxidation during high light stress of Arabidopsis.
► This is not caused by photoinhibition of photosystem II.
► Oxidation of the pool is caused by singlet oxygen generated in photosystem II.
► Non-photochemical quenching also contributes to the oxidation.
Journal: Biochimica et Biophysica Acta (BBA) - Bioenergetics - Volume 1817, Issue 5, May 2012, Pages 705–710