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1. A PHYSIOLOGICAL ROLE OF CYCLIC
ELECTRON TRANSPORT AROUND
PHOTO-SYSTEM I IN SUSTAINING
PHOTOSYNTHESIS UNDER FLUCTUATING
LIGHT IN RICE
Submitted to
Pak Zeily

2. INTRODUCTION
Photosynthesis
Photosystem-I
PGR5
Excess light
energy effects
NDH
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3. Plants need a highly responsive regulatory
system to keep photosynthetic light reactions
in balance with the needs and restrictions of
the downstream metabolism
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4. MATERIAL AND METHODS
Analysis of Gas exchange, Chlorophyll
fluorescence and P- 700 measurements.
 Measurement with GFS-3000, Dual-PAM-100 system
Calculation of quantum yield
 For photosystem I
Y(1)=1-Y(ND)-Y(NA)
• For photosystem II
Y(II)=(Fm′ –F′ )/Fm′
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5.  Photochemical quenching
qP = (Fm′ –F′ )/(Fm′ –Fo′ )
 Fraction of photosystem II
qL = qP × (Fo′ /F′ )
 Non-photochemical quenching
NPQ = (Fm–Fm′ )/Fm′
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6.  Analysis of photo-inhibition
 Quantifications of Photosynthetic
components and Immunoblot analysis
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7. RESULTS
Photosynthetic components in PGR5-defective and NDH-
defective mutants.
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8.  Role of PGR5 and NDH dependent cyclic electron
transport in photosynthetic response under fluctuating light
after constant high light
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9.  Role of PGR5 and NDH dependent cyclic electron
transport in photosynthesis under repeated light fluctuations
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12.  Effect of PGR5 knockdown or crr6 defect on alleviation of
photo-inhibition under fluctuating light conditions
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13.  Role of PGR5 and NDH dependent cyclic electron
transport in plant growth under fluctuating light
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14.  Role of PGR5 dependent and NDH dependent CEF-PSI
from photo-damage under fluctuating light
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15. REFERENCE
Yamori, W., Makino, A., & Shikanai, T. (2016). A physiological
role of cyclic electron transport around photosystem I in
sustaining photosynthesis under fluctuating light in
rice. Scientific Reports, 6, 20147.
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