| Effect of chitosan on seed germination and seedling physiological characters of wheat under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2016.01.28 |
| Key Words: wheat chitosan seed germination seedlings growth salt stress |
| Author Name | Affiliation | | WANG Yu-ping | College of Horticulture, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Key Laboratory of Crop Improvement and Germplasm Enhancement, Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | YU Dan | Gansu Key Laboratory of Crop Improvement and Germplasm Enhancement, Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | LI Cheng | Gansu Key Laboratory of Crop Improvement and Germplasm Enhancement, Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China | | ZHOU Xiao-jie | Gansu Key Laboratory of Crop Improvement and Germplasm Enhancement, Gansu Provincial Key Laboratory of Aridland Crop Science, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Two different wheat varieties Yanzhan 08231 and Xiaoyan 986 were used as materials to examine the effect of exogenous chitosan (CTS) on seed germination and seedlings physiological characteristic under the treatment of 150 mmol·L-1 NaCl. The result showed that the germination energy, germination percentage, germination index, vigor index and relative ɑ-amylase activity of the seed were increased after being presoaked with exogenous 0.1%～0.5% CTS. 0.3% CTS had the best effect, showing 27.84% and 25.33%, 9.94% and 19.95%, 38.49% and 32.30%, and 72.72% and 82.83% increases from the control in germination energy, germination percentage, germination index, vigor index of Yanzhan 08231 and Xiaoyan 986 seeds, respectively. With the treatment of 0.1%～0.5% CTS, the wheat seedling had higher plant height, fresh weight, dry weight, activities of superoxide dismutase (SOD) and peroxidase (POD), proline content and root activities, but lower content of malondialdehyde (MDA) than the control, and 0.3% CTS treatment also gave the best result. Compared with the control, the plant height, fresh weight, dry weight of Yanzhan 08231 and Xiaoyan 986 seedlings were increased by 32.60% and 36.74%, 26.08% and 38.77%, 24.05% and 35.87%, respectively. Xiaoyan 986 was more salt tolerant than Yanzhan 08231, and mitigation effect of CTS on salt stress was also more obvious on Xiaoyan 986 than Yanzhan 08231. These results indicated that the exogenous CTS (chitosan) could effectively mitigate the injuries of salt stress and increase salt tolerance of wheat seeds and seedlings. The best treatment concentration of chitosan was 0.3%. When the concentration of chitosan was higher than 0.5%, no mitigation effect was observed under the salt stress. |
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