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| Effects of trehalose on the growth of rice seedlings under cadmium stress |
| Received:January 28, 2019 |
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| KeyWord:cadmium;rice;trehalose;kinetic;chlorophyll |
| Author Name | Affiliation | E-mail | | LI Fang-jun | College of Resource and Environment, Jilin Agricultural University, Changchun 130118, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | ZHOU Qi-wen | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | QI Xin-hua | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | SONG Zheng-guo | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | forestman1218@163.com |
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| Abstract: |
| To study the effects of trehalose on the tolerance of cadmium in rice, the dynamic changes of the effects of trehalose on cadmium absorption rate and chlorophyll content of rice seedlings under cadmium stress were studied using a hydroponic experiment with the T705 variety of rice as a test material. The cadmium content of leaf and root systems of rice seedlings after cadmium treatment increased with time and concentration, but the application of exogenous trehalose effectively inhibited the absorption of cadmium in rice. After 88.96 μmol·L-1 cadmium treatment of 48 h, the cadmium accumulation of rice seedlings tended to be stable, whereas the content of cadmium in rice leaves treated with trehalose decreased by 42% compared with that of those treated with cadmium alone, and that of the roots decreased by 24.2%. The absorption rate of cadmium in rice seedlings increased with the increase in cadmium concentration, and the accumulation in the root system was much higher than that in the above shoot system. The content of cadmium in rice seedlings decreased with the increase of trehalose concentration, and the absorption rate of the leaf and root systems treated with cadmium and trehalose decreased 32.44%~41.4% and 4.29%~21.56%, respectively, compared to the plants without trehalose treatment. In addition, trehalose effectively increased the content of calcium and magnesium under the same cadmium treatment. Along with the increase of cadmium concentration or trehalose concentration, the chlorophyll content of rice seedlings gradually decreased. Under the treatment of 52.85 mmol·L-1 trehalose, the chlorophyll content of seedlings after 8.89, 17.79, 44.48, and 88.96 μmol·L-1 cadmium stress decreased the most. Compared with the blank, it decreased by 27.6%, 29.9%, 36.2%, and 35.9%, respectively. The experimental results showed that trehalose can relieve cadmium stress on rice seedlings to a certain extent. |
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