Photosynthetic characterization at different senescence stages in an early senescence mutant of rice Oryza sativa L.
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An early senescence (es) mutant of rice Oryza sativa L. with progressing death of most of leaves before heading stage was identified in the field in Hainan province. After tillering stage, the brown striations were found in the base of green leaves randomly, and then expanded to whole leaves. No fungi, bacteria, and viruses were detected in the brown striations suggesting that it was a genetic mutant. The ultrastructure of leaf cells at the site of brown striations showed breakdown of chloroplast thylakoid membrane structures and other organelles, and condensation of the cytoplasm at severe senescence stage. The photosynthetic activity and chlorophyll (Chl) contents decreased irreversibly along with leaf senescence process.
Additional key wordsphotosynthesis pigments senescence ultrastructure
minimal fluorescence level in dark-adapted leaves
minimal fluorescence level in light-adapted leaves
maximal fluorescence level in dark-adapted leaves
maximal fluorescence level in light-adapted leaves
variable fluorescence level in dark-adapted leaves
variable fluorescence level in light-adapted leaves
maximal efficiency of PSII photochemistry
efficiency of excitation energy capture by open PSII reaction centers
photosynthetic photon flux density
photochemical quenching coefficient
actual PSII efficiency
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This work is supported by Chinese National Nonprofit Institute Research Grant of CATAS-RRI (YWFZX09-02(N)) and Supported by an earmarked fund for Modern Agro-industry Technology Research System (No.nycytx-34-GW1-2).
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