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| DOI：10.13522/j.cnki.ggps.20190103 |
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| Effects of Applied Polyamines on Wheat Assimilates Transport and Grain Physiological Characteristics under High Temperature Stress after Anthesis |
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JING Jianguo, LI Youfang, JIA Shuping, XIANG Xuechun, LI Weihua
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College of Agriculture, Shihezi University/The key Laboratory of Oasis Eco-agriculture of Xinjiang Bingtuan, Shihezi 838202, China
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| Abstract: |
| 【Objective】The purpose of this paper is to find out the relationship between exogenous polyamines and alleviating effect on the injury of spring wheat after anthesis under high temperature and to clarify its physiological mechanism. 【Method】During the growth of spring wheat from March to July 2018, spring wheat varieties XC 6 and XC 31 were selected to treat with high temperature. The high temperature stress treatment was carried out in the shed for 8~15 days after anthesis with comparing the differences in dry matter accumulation and transport, antioxidant enzyme activity and osmotic adjustment substance content among normal temperature control (CK), high temperature treatment (HT), external application of spermine (HT+Spm) and spermidine (HT+Spd) under high temperature. 【Result】 HT treatment significantly increased the contributions of storage assimilates to the grains of 1 knot under panicle of the two cultivars before anthesis, while after anthesis it was significantly decreased. Exogenous spraying Spm and Spd could significantly increase the contributions to the grains of after anthesis assimilates of the two cultivars; HT treatment increased SOD and CAT activity, MDA and soluble sugar content, decreased POD activity and proline content, and exogenous Spm and Spd decreased MDA and soluble sugar content, and increased POD, CAT and SOD activity. 【Conclusion】Alleviating effect of exogenous Spm on the injury of spring wheat after anthesis under high temperature was better than that of Spd. |
| Key words: wheat; polyamine; high temperature stress; antioxidant enzyme activity |
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