| 李昉峻,周其文,漆新华,宋正国.海藻糖对镉胁迫下水稻幼苗生长的影响[J].农业环境科学学报,2019,38(8):1827-1834. |
| 海藻糖对镉胁迫下水稻幼苗生长的影响 |
| Effects of trehalose on the growth of rice seedlings under cadmium stress |
| 投稿时间：2019-01-28 |
| DOI：10.11654/jaes.2019-0114 |
| 中文关键词: 镉 水稻 海藻糖 动力学 叶绿素 |
| 英文关键词: cadmium rice trehalose kinetic chlorophyll |
| 基金项目:国家重点研发计划项目（2016YFD0800806） |
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| 摘要点击次数: 1733 |
| 全文下载次数: 1490 |
| 中文摘要: |
| 为了研究海藻糖对水稻镉耐受性的影响，以T705品种水稻为试验材料，采用水培试验研究了镉胁迫下，海藻糖对水稻幼苗镉吸收速率及叶绿素含量影响的动态变化。水稻幼苗茎叶和根系镉含量随着镉处理时间的延长和浓度的提高而增大，但外源海藻糖的施用则有效抑制了水稻镉吸收。经过88.96 μmol·L-1镉处理48 h后，水稻幼苗的镉积累量趋于平稳，镉+海藻糖处理的水稻茎叶镉含量相比只有镉处理的减少了42.0%，根系部分则下降了24.2%。水稻幼苗镉吸收速率随着镉浓度的增加而增大，且根系积累量远高于地上部分。水稻幼苗镉含量随着海藻糖处理浓度的增加而减少，镉+海藻糖处理的茎叶和根系的吸收速率分别比只有镉处理的减少了32.44%~41.4%和4.29%~21.56%。此外，海藻糖有效提高了相同镉处理下的钙、镁含量。伴随着镉浓度或者海藻糖浓度的升高，水稻幼苗叶绿素含量逐渐降低，在52.85 mmol·L-1海藻糖处理下，8.89、17.79、44.48 μmol·L-1和88.96 μmol·L-1镉胁迫后的幼苗叶绿素含量降幅最大，与空白相比分别下降了27.6%、29.9%、36.2%和35.9%。试验结果表明，海藻糖可在一定程度上缓解镉对水稻幼苗的胁迫。 |
| 英文摘要: |
| 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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