| Effects of exogenous salicylic acid on hormone contents and growth characteristics of cotton seedlings under salt stress |
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| DOI：10.7606/j.issn.1000-7601.2017.05.32 |
| Key Words: exogenous salicylic acid cotton seedling salt stress hormone growth index |
| Author Name | Affiliation | | LI Xing-xing | College of Agronomy, Xinjiang University/Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | WANG Li-hong | College of Agronomy, Xinjiang University/Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | GAO Li-li | College of Agronomy, Xinjiang University/Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China | | ZHANG Ju-song | College of Agronomy, Xinjiang University/Research Center of Cotton Engineering, Ministry of Education, Urumqi, Xinjiang 830052, China |
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| Abstract: |
| Zhongmiansuo 41 and Zhongmiansuo 49 were used as the experimental materials, in pot experiment to study the effects of exogenous salicylic acid (SA) on the hormone level and growth characteristics of cotton seedlings under salt stress. The results showed: (1) Under 0.6% NaCl stress, ABA content of cotton seedling leaves increased, CTK, GA and IAA content decreased, and under the 0.05 mmol·L-1 SA soaking with 0.2 mmol·L-1 spraying treatment, ABA content of Zhongmiansuo 41 and Zhongmiansuo 49 seedlings decreased by 59.14% and 76.71% respectively, CTK, GA, IAA content increased by 55.39%, 21.05%, 22.39% and 17.08%, 12.5%, 18.20% respectively, indicating that SA treatment can effectively alleviate the salt stress injury; (2) Under 0.6% NaCl stress treatment, ABA/IAA+GA, CTK/IAA and ABA/CTK values increased, decreased and increased again, under the 0.05 mmol·L-1 SA soaking with 0.2 mmol·L-1 spraying treatment, ABA/IAA+GA and ABA/CTK values of Zhongmiansuo 41 and Zhongmiansuo 49 seedlings decreased by 63.40%, 74.03%, 71.66% and 79.99% respectively, CTK/IAA values increased by 28.41% and 21.18%, indicating that SA can make seedlings restore the dynamic balance of hormones and promote the growth of seedlings; (3) Under 0.6% NaCl stress, cotton seedling height, root fresh weight, stem fresh weight and leaf fresh weight decreased, different concentrations of exogenous SA soaking and spraying made them recovered, root performance was the most obvious, the 0.05 mmol·L-1 SA soaking with 0.2 mmol·L-1 spraying treatment under 0.6% NaCl stress, the plant fresh weight of the two varieties of cotton seedling were increased by 24.20% and 22.39%. SA can change regulation of hormone content in cotton seedlings to improve cotton seedling salt tolerance, the alleviation effect of 0.05 mmol·L-1 SA soaking and 0.2 mmol·L-1 spraying treatment on cotton seedlings under salt stress was obvious. |
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