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Age-dependent changes in the functions and compositions of photosynthetic complexes in the thylakoid membranes of Arabidopsis thaliana

Age-dependent changes in the functions and compositions of photosynthetic complexes in the thylakoid membranes of Arabidopsis thaliana
Nath, KrishnaPhee, Bong-KwanJeong, SuyeongLee, Sun YiTateno, YoshioAllakhverdiev, Suleyman I.Lee, Choon-HwanNam, Hong Gil
DGIST Authors
Nam, Hong Gil
Issue Date
Photosynthesis Research, 117(1-3), 547-556
Article Type
ArabidopsisArabidopsis ProteinArabidopsis ProteinsArabidopsis ThalianaCarbon DioxideChl Contents and Chl a/b RatioChlorophyllDevelopmental Stage and SenescenceFluorescenceGrowth, Development and AgingLight-Harvesting Protein ComplexesLight-Harvesting SystemMetabolismNutrient MobilizationPhotochemical ProcessesPhotochemistryPhotosynthesisPhotosynthetic Complexes and Their ComponentsPhotosynthetic PerformancePhotosynthetic Reaction Center Complex ProteinsPhotosystem IPhotosystem I Protein ComplexPhotosystem IIPhotosystem II Protein ComplexPlant LeafPlant LeavesThylakoidThylakoidsTimeTime Factors
Photosynthetic complexes in the thylakoid membrane of plant leaves primarily function as energy-harvesting machinery during the growth period. However, leaves undergo developmental and functional transitions along aging and, at the senescence stage, these complexes become major sources for nutrients to be remobilized to other organs such as developing seeds. Here, we investigated age-dependent changes in the functions and compositions of photosynthetic complexes during natural leaf senescence in Arabidopsis thaliana. We found that Chl a/b ratios decreased during the natural leaf senescence along with decrease of the total chlorophyll content. The photosynthetic parameters measured by the chlorophyll fluorescence, photochemical efficiency (F v/F m) of photosystem II, non-photochemical quenching, and the electron transfer rate, showed a differential decline in the senescing part of the leaves. The CO2 assimilation rate and the activity of PSI activity measured from whole senescing leaves remained relatively intact until 28 days of leaf age but declined sharply thereafter. Examination of the behaviors of the individual components in the photosynthetic complex showed that the components on the whole are decreased, but again showed differential decline during leaf senescence. Notably, D1, a PSII reaction center protein, was almost not present but PsaA/B, a PSI reaction center protein is still remained at the senescence stage. Taken together, our results indicate that the compositions and structures of the photosynthetic complexes are differentially utilized at different stages of leaf, but the most dramatic change was observed at the senescence stage, possibly to comply with the physiological states of the senescence process. © 2013 Springer Science+Business Media Dordrecht.
Related Researcher
  • Author Nam, Hong Gil CBRG(Complex Biology Research Group)
  • Research Interests Plant Aging and Life History; Systems Biology; Complexbiology; Comparative Aging Research
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Department of New BiologyCBRG(Complex Biology Research Group)1. Journal Articles

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