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Journal of Plant Biology

, Volume 62, Issue 1, pp 27–38 | Cite as

Chlorophyll Degradation and Light-harvesting Complex II Aggregate Formation During Dark-induced Leaf Senescence in Arabidopsis Pheophytinase Mutants

  • Young Nam Yang
  • Rana B. Safarova
  • So-Yon Park
  • Yasuhito Sakuraba
  • Min-Hyuk Oh
  • Ismayil S. Zulfugarov
  • Chin Bum Lee
  • Ayumi Tanaka
  • Nam-Chon PaekEmail author
  • Choon-Hwan LeeEmail author
Original Article
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Abstract

The stay-green mutant of Arabidopsis thaliana, ore10 forms stable light-harvesting complex II (LHCII) aggregates during dark-induced senescence, which showed a single base deletion (G1351) in the coding region of the pheophytinase (PPH) gene. PPH specifically dephytylates the Mg-free chlorophyll (Chl) pigment pheophytin, yielding pheophorbide. In both ore10 and pph-1 mutants, pheophytin a accumulated due to the deficiency of PPH gene, but the amount was relatively smaller than that of degraded Chl, and most of the pheophytin a was bound to the stable LHCII forming aggregates with some other Chl-protein (CP) complexes. Comparison of Chl a/b ratios in thylakoids, aggregates, and LHCII indicated that the suppression of Chl b to Chl a conversion was stronger when Chl b reductase was missing and weak when PPH is missing in the large Chl catabolic complex, which allowed the partial degradation of Chl b. These results suggest that the PPH-dependent pathway is not specific for LHCII, but common for all CP complexes, including LHCII. In PPH-deficient mutants, the degradation of LHCII was suppressed by the formation of aggregates, and some of the remaining CP complexes and pheophytin a were included in the aggregates. Non-included CP complexes were degraded via an unknown mechanism.

Keywords

Aggregate Chlorophyll degradation Chlorophyllprotein complexes Dark-induced senescence Light-harvesting 
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Copyright information

© Korean Society of Plant Biologists and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Young Nam Yang
    • 1
  • Rana B. Safarova
    • 1
  • So-Yon Park
    • 2
  • Yasuhito Sakuraba
    • 2
  • Min-Hyuk Oh
    • 1
    • 6
  • Ismayil S. Zulfugarov
    • 1
  • Chin Bum Lee
    • 3
  • Ayumi Tanaka
    • 4
  • Nam-Chon Paek
    • 2
    • 5
    Email author
  • Choon-Hwan Lee
    • 1
    Email author
  1. 1.Department of Integrated Biological Science and Department of Molecular BiologyPusan National UniversityBusanKorea
  2. 2.Department of Plant Science, Plant Genomics and Breeding Institute, Research Institute of Agriculture and Life SciencesSeoul National UniversitySeoulKorea
  3. 3.Department of Molecular BiologyDong-eui UniversityBusanKorea
  4. 4.Institute of Low Temperature ScienceHokkaido UniversitySapporoJapan
  5. 5.Crop Biotechnology Institute, Institutes of Green Bio Science and TechnologySeoul National UniversityPyeongchangKorea
  6. 6.Animal and Plant Quarantine AgencyYeongnam Regional OfficeBusanKorea

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