期刊
ACTA PHYSIOLOGIAE PLANTARUM
卷 35, 期 11, 页码 3099-3107出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11738-013-1343-5
关键词
Ionic stress; Osmotic stress; Salt tolerance; Silicon; Sugar; Water potential
资金
- National Natural Science Foundation of China [31101597]
- West Light Foundation of the Chinese Academy of Sciences, Chinese Universities Scientific Fund [Z109021202]
- 111 project of Chinese Education Ministry [B12007]
Silicon has been widely reported to have a beneficial effect on improving plant tolerance to biotic and abiotic stresses. However, the mechanisms of silicon in mediating stress responses are still poorly understood. Sorghum is classified as a silicon accumulator and is relatively sensitive to salt stress. In this study, we investigated the short-term application of silicon on growth, osmotic adjustment and ion accumulation in sorghum (Sorghum bicolor L. Moench) under salt stress. The application of silicon alone had no effects upon sorghum growth, while it partly reversed the salt-induced reduction in plant growth and photosynthesis. Meanwhile, the osmotic potential was lower and the turgor pressure was higher than that without silicon application under salt stress. The osmolytes, the sucrose and fructose levels, but not the proline, were significantly increased, as well as Na+ concentration was decreased in silicon-treated plants under salt stress. These results suggest that the beneficial effects of silicon on improving salt tolerance under short-term treatment are attributed to the alleviating of salt-induced osmotic stress and as well as ionic stress simultaneously.
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