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| Toxic effects of antimony on rice seedlings under different pH conditions |
| Received:April 16, 2022 Revised:July 01, 2022 |
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| KeyWord:antimony stress;pH;rice seedling;chlorophyll fluorescence;antioxidant enzyme |
| Author Name | Affiliation | E-mail | | YAO Lihua | College of Geography and Environmental Science, Zhejiang Normal University, Jinhua 321000, China
College of Life Sciences, Taizhou University, Taizhou 318000, China | | | ZHA Jianjun | Taizhou Research Institute, Southern University of Science and Technology, Taizhou 318000, China | | | LI Yali | College of Life Sciences, Taizhou University, Taizhou 318000, China | | | PAN Xiaocui | College of Life Sciences, Taizhou University, Taizhou 318000, China | | | YU Hongmei | College of Geography and Environmental Science, Zhejiang Normal University, Jinhua 321000, China | yuhongmei@zjnu.cn | | SHU Liangzuo | College of Life Sciences, Taizhou University, Taizhou 318000, China | shulz69@163.com |
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| Abstract: |
| To investigate the effect of pH on the growth of rice under antimony stress, this study investigated the uptake of antimony in rice under different pH conditions and the effect of antimony on the growth, chlorophyll fluorescence characteristics, light response curve parameters, and antioxidant enzyme activities of rice by performing hydroponic experiments. The results showed that antimony stress inhibited the growth and aboveground and root biomass accumulation of rice, reducing plant height by 4.30%-11.72%, compared with the antimony -free treatment. The maximum photochemical quantum yield of leaf PS Ⅱ（Fv / Fm） , actual photochemical efficiency, photosynthetic electron transfer efficiency , and photochemical quenching coefficient were significantly decreased under antimony stress. Initial slope, maximum relative electron transfer rate, and half-saturation light intensity also decreased significantly, whereas catalase, superoxide dismutase, and peroxidase activities and malondialdehyde content increased significantly by 11.66%, 16.86%, 17.85%, and 22.04%, respectively. Moreover, pH 4 and pH 5 treatments promoted the absorption of antimony by rice and increased the range of the effects of antimony stress on the evaluated parameters of rice seedlings, while pH 6 and pH 7 treatments effectively alleviated the changes caused by antimony stress in the indicators of rice seedlings. Therefore, under antimony stress, rice plants absorb a large amount of antimony, which destroy the chlorophyll fluorescence characteristics and protective enzyme activities and subsequently causes toxicity in plants. pH 6 and pH 7 treatments alleviate the effects of antimony stress on rice seedling growth by reducing antimony absorption, maintaining cell membrane stability, and regulating heat dissipation mechanism and antioxidant enzyme system. |
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