| 微囊藻毒素对水稻根系生长和抗氧化系统的影响 |
| 摘要点击 1839 全文点击 1106 投稿时间：2013-08-26 修订日期：2013-10-10 |
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| 中文关键词 微囊藻毒素 水稻 过氧化氢酶 生长 根系活力 |
| 英文关键词 microcystins rice catalase growth root activity |
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| 中文摘要 |
| 以水稻幼苗为材料，研究了不同质量浓度（1、100、1000、3000 μg·L-1）微囊藻毒素（MCs）在胁迫期和恢复期对水稻幼苗根系生长、吸收活力、抗氧化系统的影响以及MCs在水稻根部的积累.结果表明，胁迫处理7 d，MCs在水稻根部的积累量与MCs质量浓度呈正相关.1 μg·L-1 MCs处理促进了根系生长，根系活力上升，过氧化氢酶（CAT）活性上升有效维持H2O2于正常水平；100 μg·L-1 MCs处理下，根系生长受抑，根系活力下降，CAT无显著变化；在高质量浓度（1000 μg·L-1、3000 μg·L-1）MCs处理下，不仅根系生长受抑、根系活力下降，且CAT活性受抑，H2O2大量积累，膜质过氧化加剧.相比胁迫期，恢复7 d后各处理组水稻根系MCs的积累量均低于胁迫期.100 μg·L-1 MCs处理组根系各生长指标、根系活力、丙二醛（MDA）、H2O2和CAT的变幅减小，优于胁迫期，显示出一定程度的恢复，而1000 μg·L-1和3000 μg·L-1 MCs处理组，根系生长与根系活力均低于胁迫期，氧化胁迫进一步加剧，表明高质量浓度（1000 μg·L-1和3000 μg·L-1）MCs对水稻根系造成的伤害不可逆. |
| 英文摘要 |
| The effect of different concentrations (1, 100, 1000 and 3000 μg·L-1) of microcystins (MCs) on growth, absorb activity, antioxidant system and its accumulation in roots of rice seedlings were studied. The results show that MCs accumulation was positively correlated with MCs concentration. After the treatment with 1 μg·L-1MCs, the root growth and activity increased. Meanwhile, catalase (CAT) activity was increased to maintain H2O2 at normal levels. After the treatment with 100 μg·L-1 MCs, the root growth and activity were inhibited whereas CAT had no obvious change. High concentrations (1000 μg·L-1 and 3000 μg·L-1) of MCs not only inhibited root growth and activity, but decreased CAT activity, leading to excessive H2O2 accumulation and membrane peroxidation. After a 7-day recovery, MCs accumulations in roots in all treatment groups were all lower than those measured during the stress period. For the 100 μg·L-1 MCs treated group, the inhibition on root growth and root activity, and membrane peroxidation were alleviated, better than those measured during the stress period. However, for 1000 μg·L-1 and 3000 μg·L-1 MCs treated groups, inhibition on root growth, root activity, and CAT activity were heavier than those during the stress period, and oxidation stress intensified further, indicating that the damage caused by high concentrations (1000 μg·L-1 and 3000 μg·L-1) of MCs on rice roots was irreversible. |
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