Abstract
Flooding stress (FS) induced changes in pigment and protein contents and in photochemical efficiency of thylakoid membranes of chloroplasts were investigated during senescence of primary leaves of rice seedlings. Leaf senescence was accompanied by loss in 2,6-dichlorophenolindophenol (DCPIP) photoreduction, rate of oxygen evolution, quantum yield of photosystem 2 with an increase in MDA accumulation, and non-photochemical quenching (NPQ) of chlorophyll fluorescence. These changes were further aggravated when the leaves during this period experienced FS. The increase in NPQ value under stress may indicate photosynthetic adaptation to FS.
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Abbreviations
- Chl:
-
chlorophyll
- DCPIP:
-
2,6-dichlorophenolindophenol
- DPC:
-
diphenylcarbazide
- EDTA:
-
ethylenediamine tetraacetate
- F0 :
-
initial fluorescence
- FS:
-
flooding stress
- Fv/Fm :
-
photochemical efficiency of photosystem 2
- OEC:
-
oxygen evolving complex
- ΦPS2 :
-
quantum yield of photosystem 2
- qP :
-
photochemical quenching coefficient
- MDA:
-
malondialdehyde
- NPQ:
-
non-photochemical quenching
- PS:
-
photosystem
- RC:
-
reaction centre
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Mishra, S.K., Patro, L., Mohapatra, P.K. et al. Response of senescing rice leaves to flooding stress. Photosynthetica 46, 315–317 (2008). https://doi.org/10.1007/s11099-008-0058-0
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DOI: https://doi.org/10.1007/s11099-008-0058-0