Abstract
Aims
The purpose of the present study was to investigate the mechanism of carbon monoxide (CO) and hematin in alleviating the inhibition of Cassia obtusifolia seeds and seedlings. NaCl (100 mM) was used to mimic salinity stress in a series of experiments.
Methods
Varying combinations of CO in a saturated aqueous solution and hematin (1.0 μM) were added to seeds and seedlings under salinity stress. Seed germination indices and seedling parameters were investigated.
Results
Seed germination and seedling growth were significantly inhibited under salinity stress. NaCl-induced inhibitory effects on seed germination and seedling growth were ameliorated by hematin or the CO aqueous solution. Addition of 1.0 μM hematin or 5 % CO-saturated aqueous solution to seeds and seedlings significantly alleviated damage to the plant cells under salinity stress. Hematin and the CO aqueous solution enhanced chlorophyll concentration, total soluble sugars, free proline, and soluble protein, and improved photosystem II (PSII) photochemical efficiency levels, PSII actual photochemical efficiency, and the photochemical quench coefficient. In contrast, the non-photochemical quenching coefficient decreased. Hematin and the CO aqueous solution also enhanced the activities of superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, and glutathione reductase, thus alleviating oxidative damage, as indicated by decreases in hiobarbituric acid reactive substances, hydrogen peroxide concentration, relative conductivity, and lipoxygenase activity. Heme oxygenase (HO) activity was increased by hematin treatment. Hematin may contribute to endogenous HO-derived CO, since the addition of zinc protoporphyrin IX or hemoglobin reversed the protective effects conferred by hematin specified above.
Conclusions
Based on the experimental results, we conclude that hematin and CO induce advantageous effects on the attenuation of salt-stress inhibition of C. obtusifolia seeds and seedlings and alleviate oxidative damage by conferring beneficial cytoprotection and activating anti-oxidant enzymes.
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Abbreviations
- CO:
-
carbon monoxide
- H:
-
hematin
- HO:
-
heme oxygenase
- Hb:
-
hemoglobin
- ZnPPIX:
-
zinc protoporphyrin IX
- BV-IXα:
-
biliverdin-IXα
- Gi:
-
germination index
- Gr:
-
germination rate
- Gv:
-
germination vigor
- Vi:
-
vigor index
- Chl:
-
Chlorophyll
- F v/F m :
-
photochemical efficiency of photosystem II
- \( F_v^{\prime }/F_m^{\prime } \) :
-
photochemical efficiency
- ΦPSII:
-
PSII actual photochemical efficiency
- qP :
-
photochemical quench coefficient
- NPQ:
-
no-photochemical quenching coefficient
- ROS:
-
reactive oxygen species
- TBARS:
-
thiobarbituric acid reactive substances
- H2O2 :
-
hydrogen peroxide
- LOX:
-
lipoxygenase
- NBT:
-
nitroblue tetrazolium
- SOD:
-
superoxide dismutase
- POD:
-
peroxidase
- CAT:
-
catalase
- APX:
-
ascorbate peroxidase
- GR:
-
glutathione reductase.
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Acknowledgments
The authors gratefully acknowledge the National Natural Science Foundation of China for their financial support (Grant Nos. 30560025 and 31060069).
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Zhang, C., Li, Y., Yuan, F. et al. Effects of hematin and carbon monoxide on the salinity stress responses of Cassia obtusifolia L. seeds and seedlings. Plant Soil 359, 85–105 (2012). https://doi.org/10.1007/s11104-012-1194-7
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DOI: https://doi.org/10.1007/s11104-012-1194-7