Yin, L. and Wang, S. and Liu, P. and et al, . (2014) Silicon-mediated changes in polyamine and 1-aminocyclopropane-1-carboxylic acid are involved in silicon-induced drought resistance in Sorghum bicolor L. Plant Physiology and Biochemistry, 80. pp. 268-277.
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Abstract
The fact that silicon application alleviates drought stress has been widely reported, but the mechanism it underlying remains unclear. Here, morphologic and physiological changes were investigated in sorghum (Sorghum bicolor L.) seedlings treated with silicon and exposed to PEG-simulated drought stress for seven days. Drought stress dramatically decreased growth parameters (biomass, root/shoot ratio, leaf area, chlorophyll concentration and photosynthetic rate), while silicon application reduced the drought-induced decreases in those parameters. Leaf relative water content and transpiration rate were maintained at high levels compared to those in seedlings without silicon. The soluble sugar contents were increased, but the proline contents and the osmotic potential were decreased, showing that osmotic adjustment did not contribute to the silicon induced-drought resistance. Furthermore, levels of both free and conjugated polyamines (PAs) levels, including putrescine, spermidine and spermine, were all found to be increased by silicon under drought stress both in leaf and root. Meanwhile, 1-aminocyclopropane-1-carboxylic acid (ACC), the precursor of ethylene, was markedly decreased by supplemental silicon. Several key PA synthesis genes were upregulated by silicon under drought stress. These results suggest that silicon improves sorghum drought resistance by mediating the balance of PAs and ethylene levels. In leaf, the increased PAs and decreased ACC help to retard leaf senescence. In root, the balance between PAs and ACC participates in the modulation of root plasticity, increases the root/shoot ratio, and contributes to an increase in water uptake. These results suggest that silicon increases drought resistance through regulating several important physiological processes in plants
| Item Type: | Article |
|---|---|
| Additional Information: | This work was supported by the National Natural Science Foundation of China (No. 31101597), the West Light Foundation of the Chinese Academy of Sciences, Chinese Universities Scientific Fund (QN 2012048), and the 111 Project of the Chinese Education Ministry (No. B12007). |
| Uncontrolled Keywords: | Silicon; Polyamines; Drought stress; 1-Aminocyclopropane-1-carboxylic acid; Ethylene; Sorghum |
| Author Affiliation: | State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China |
| Subjects: | Plant Production Plant Protection Statistics and Experimentation |
| Divisions: | Sorghum |
| Depositing User: | Ms Ishrath Durafsha |
| Date Deposited: | 17 Jun 2014 10:41 |
| Last Modified: | 17 Jun 2014 10:41 |
| Official URL: | http://dx.doi.org/10.1016/j.plaphy.2014.04.014 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/13256 |
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