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| Effects of thiram on Cd accumulation and physiological characteristics of wheat seedlings under Cd stress |
| Received:March 21, 2023 Revised:May 23, 2023 |
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| KeyWord:wheat seedling;thiram;cadmium accumulation;photosynthesis;antioxidant system |
| Author Name | Affiliation | E-mail | | GAO Zhixin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | MI Luqi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | | LIU Yetong | Tianjin Academy of Agricultural Sciences, Tianjin 300381, China | | | LI Boyan | Agro-Ecological Environment Monitoring and Agricultural Products Quality Inspection Center of Tianjin, Tianjin 300193, China | | | QIN Xu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | qinxu621@163.com | | SUN Yuebing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | sw314@sina.com |
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| Abstract: |
| To investigate the effects of thiram on the cadmium(Cd)accumulation and physiological characteristics of wheat seedlings under Cd stress, this study used a conventional winter wheat variety as the test crop and conducted a hydroponics experiment. High(400-times dilution) and low(800-times dilution)thiram dosages were sprayed on wheat seedlings under stress caused by different concentrations of Cd to study the effects of thiram on Cd accumulation and distribution and physiological characteristics such as photosynthesis and the antioxidant system. The results indicated that applying thiram increased the accumulation of Cd and S in the wheat shoots. The highest increases were 73.8% for Cd and 151.2% for S. Under Cd stress with the same Cd concentration, as the thiram dosage increased, the Cd content in the various subcellular organs of wheat increased. A higher proportion of Cd was found in the cell wall, and a lower proportion was observed in the cell-soluble components. Furthermore, Cd shifted from being extractable by chloride to be extractable by ethanol and water. The foliar application of thiram did not significantly affect the fresh weight of the wheat seedling shoots or the root length. However, in terms of photosynthesis, under Cd stress, the foliar application of thiram increased the photosynthetic rate and the contents of chlorophyll a and chlorophyll b in wheat leaves; the highest increases were 62.7%, 36.0%, and 89.5%, respectively. Regarding antioxidant activity, under Cd stress, the foliar application of thiram increased the contents of MDA, H2O2, and CAT in wheat leaves; the highest increases were 27.1%, 123.6%, and 464.3%, respectively. However, the SOD content decreased, with a maximum decrease of 20.1%. The findings indicated that thiram application promoted Cd accumulation in wheat seedlings and improved the photosynthesis of plants; however, it decreased the antioxidant capacity of the plants and aggravated Cd stress. The effect of thiram application under high-dose conditions was stronger. This finding provides useful information for studying the effects of pesticides on Cd accumulation in crops and the physiological characteristics of Cd stress. Thiram application should be avoided or minimized as much as possible to control diseases in Cd-polluted wheat fields. |
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