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| Effects of different water managements on the uptake and transport of selenium in rice exposed to different selenium species |
| Received:February 19, 2019 |
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| KeyWord:rice;Se;water management;transfer coefficient |
| Author Name | Affiliation | E-mail | | DI Xue-rong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of AgroEnvironmental Pollution Control and Prevention, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | GUAN Yuan-qing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DING Yong-zhen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of AgroEnvironmental Pollution Control and Prevention, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | dingyongzhen@caas.cn | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | DAI Li-hong | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | FENG Ren-wei | Fujian Agriculture and Forestry University, Fuzhou 350002, China | | | WANG Rui-gang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
Key Laboratory of AgroEnvironmental Pollution Control and Prevention, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LI Dao-xian | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| Selenium is a beneficial trace element for plants. In this study, a pot experiment was conducted to study the effects of conventional irrigation and wetting irrigation on Se uptake and transport in rice subjected to different doses(0, 1.0, and 5.0 mg·kg-1)of selenite (Na2SeO3)and selenate(Na2SeO4). The results showed that the addition of Se significantly promoted rice growth. Compared with the control treatment, under wetting irrigation, the addition of Se increased the straw dry weight and grain yield by 22.35%~39.76% and 35.42%~61.94%, respectively. Under conventional irrigation, the straw dry weight and grain yield were increased by 19.18%~57.23% and 4.02%~55.37%, respectively. The content of Se in the roots, stems, leaves, and grains of rice increased significantly with an increase in Se treatment concentration. Under wetting irrigation, the root Se content in the low(1.0 mg·kg-1)and high(5.0 mg·kg-1)Se(Ⅳ)treatments was 3.69 and 12.05 times higher than that in the control treatment. The respective fold changes were 2.71 and 20.33 in stems, 1.95 and 10.76 in leaves, 6.94 and 29.72 in brown rice, and 6.86 and 31.61 in fine grains. However, under conventional irrigation and Se(Ⅳ)treatment conditions, the respective fold changes were 2.12 and 5.56 in roots, 2.51 and 11.70 in stems, 2.97 and 10.94 in leaves, 4.53 and 23.69 in brown rice, and 5.29 and 23.37 in fine grains. There were significant interactions among Se treatment concentration, Se species treatment, and water management strategies with regard to Se content in the roots, stems, leaves, and brown rice(P<0.05). Under wetting irrigation, Se concentration in the roots exposed to Se(Ⅳ)was significantly higher than that in roots exposed to Se(Ⅵ). When plants were exposed to 5.0 mg·kg-1 Se, the stem Se content under wetting irrigation was significantly higher than that under conventional irrigation, and the stem Se content in plants exposed to Se(Ⅳ)treatment was significantly higher than that in plants exposed to Se(Ⅵ)treatment. Compared with conventional irrigation, wetting irrigation facilitated the accumulation of Se in the grain. Furthermore, compared with conventional irrigation, wetting irrigation significantly increased the Se transfer coefficients of roots to stems, stems to grains, and leaves to grains, by 40%~158.82%, 44.23%~94.73%, and 6.78%~228.85%, respectively. In summary, compared with conventional irrigation, wetting irrigation is conducive to Se accumulation in rice grains. |
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