Abstract
The interactive effects of salicylic acid (SA) and nitric oxide (NO) on alleviating cadmium (Cd) toxicity in peanut (Arachis hypogaea L.) were studied. Seedlings of two cultivars (Huayu 22 — a big seed type, and Xiaobaisha — a small seed type) were treated with 200 μM CdCl2 without or with 0.1 mM SA or 0.25 mM sodium nitroprusside (SNP, an NO donor). Results show that the Cd exposure depressed the plant growth of both the cultivars but more of Huayu 22 than of Xiaobaisha. Exogenous SA and NO alleviated Cd toxicity in both the peanut cultivars: they improved growth, chlorophyll content, photosynthesis, and mineral nutrition. Furthermore, exogenous SA or NO decreased oxidative stress by increasing activities of antioxidant enzymes and content of non-enzymatic antioxidants. Besides, in roots and leaves of both the cultivars, exogenous SA and NO increased Cd accumulation in the cell wall and decreased Cd distribution to organelles. In particular, the effect of SA+SNP was most obvious.
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Abbreviations
- ASA:
-
ascorbate
- CAT:
-
catalase
- Cd:
-
cadmium
- Chl:
-
chlorophyll
- GSH:
-
glutathione
- MDA:
-
malondialdehyde
- O2 ·− :
-
superoxide anion radical
- POD:
-
peroxidase
- ROS:
-
reactive oxygen species
- SA:
-
salicylic acid
- SOD:
-
superoxide dismutase
- SNP:
-
sodium nitroprusside
- TF:
-
translocation factor
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Acknowledgements: The authors thank English lecturers Mr. Stuart Craig (the Taishan University, Shandong, China) and Mr. Xiujuan Wang (the College of Foreign Languages, the Shandong Agricultural University, Shandong, China) for their critical reading and revision of the manuscript. Special acknowledgements are given to the editors and reviewers. Great thanks are given to Pingping Yang, the College of Animal Science Technology, the Shandong Agricultural University, Shandong, China, for supplying instruments and patient guidance. This research work was financially supported by the Project of Shandong Province Higher Educational Science and Technology Program (J14LF08) and the Shandong Provincial Natural Science Foundation of China (ZR2013CM003).
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Xu, L.L., Fan, Z.Y., Dong, Y.J. et al. Effects of exogenous salicylic acid and nitric oxide on physiological characteristics of two peanut cultivars under cadmium stress. Biol Plant 59, 171–182 (2015). https://doi.org/10.1007/s10535-014-0475-9
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DOI: https://doi.org/10.1007/s10535-014-0475-9