Abstract
The effects of cadmium on physiological and ultrastructural characteristics were evaluated in 6-d-old seedlings of two Brassica napus L. cultivars Zheda 619 and ZS 758. Results show that Cd at lower concentration (100 μM) stimulated the seedling growth but at higher concentration (500 μM) inhibited the growth of both cultivars, decreased content of photosynthetic pigments, activities of antioxidant enzymes, and increased the content of malondialdehyde and reactive oxygen species. Cd content in different parts of seedlings was higher in ZS 758 than in Zheda 619. Electron micrographs illustrated that 500 μM Cd severely damaged the leaf and root tip cells of both cultivars. Under Cd stress, the size and number of starch grains, plastoglobuli, and lipid bodies in the chloroplasts increased. In the root tip cells, enlarged vacuoles, diffused cell walls, and undeveloped mitochondria were detected.
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Abbreviations
- APX:
-
ascorbate peroxidase
- CAT:
-
catalase
- Car:
-
carotenoids
- Chl:
-
chlorophyll
- GR:
-
glutathione reductase
- MDA:
-
malondialdehyde
- POD:
-
peroxidase
- SOD:
-
superoxide dismutase
- TSP:
-
total soluble proteins
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Acknowledgements: This work was supported by National High Technology Research and Development Program of China (2011AA10A206), National Key Science and Technology Supporting Program of China (2010BAD01B04), the Science and Technology Department of Zhejiang Province (2012C12902-1), and National Natural Science Foundation of China (31071698, 31170405).
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Ali, B., Qian, P., Jin, R. et al. Physiological and ultra-structural changes in Brassica napus seedlings induced by cadmium stress. Biol Plant 58, 131–138 (2014). https://doi.org/10.1007/s10535-013-0358-5
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DOI: https://doi.org/10.1007/s10535-013-0358-5