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Photosynthetic characterization at different senescence stages in an early senescence mutant of rice Oryza sativa L.

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Photosynthetica

Abstract

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.

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Abbreviations

Chl:

chlorophyll

es :

early senescence

F0 :

minimal fluorescence level in dark-adapted leaves

F0′:

minimal fluorescence level in light-adapted leaves

Fm :

maximal fluorescence level in dark-adapted leaves

Fm′:

maximal fluorescence level in light-adapted leaves

Fv :

variable fluorescence level in dark-adapted leaves

Fv′:

variable fluorescence level in light-adapted leaves

Fv/Fm :

maximal efficiency of PSII photochemistry

Fv′/Fm′:

efficiency of excitation energy capture by open PSII reaction centers

MDA:

malondialdehyde

NBT:

nitroblue tetrazolium

NPQ:

nonphotochemical quenching

POD:

peroxidase

PPFD:

photosynthetic photon flux density

PSII:

photosystem II

qP :

photochemical quenching coefficient

SOD:

superoxide dismutase

β-Car:

β-carotene

ΦPSII :

actual PSII efficiency

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Acknowledgements

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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Authors and Affiliations

  1. Ministry of Agriculture Key Laboratory of Rubber Biology, State Key Laboratory Incubation Base for Cultivation and Physiology of Tropical Crops, Rubber Research Institute, CATAS, Danzhou, Hainan, 571737, China

    L. F. Wang & Y. Y. Chen

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  1. L. F. Wang
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  2. Y. Y. Chen
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Correspondence to L. F. Wang.

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Wang, L.F., Chen, Y.Y. Photosynthetic characterization at different senescence stages in an early senescence mutant of rice Oryza sativa L.. Photosynthetica 49, 140–144 (2011). https://doi.org/10.1007/s11099-011-0009-z

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