| 王小红,郭军康,贾红磊,李艳萍,吕欣,任倩.外源水杨酸缓解镉对番茄毒害作用的研究[J].农业环境科学学报,2019,38(12):2705-2714. |
| 外源水杨酸缓解镉对番茄毒害作用的研究 |
| The effect of exogenous salicylic acid on alleviating cadmium toxicity in tomato plants |
| 投稿时间：2019-07-16 |
| DOI：10.11654/jaes.2019-0754 |
| 中文关键词: 水杨酸 镉 番茄 活性氧 抗氧化系统 |
| 英文关键词: salicylic acid cadmium tomato active oxygen antioxidant system |
| 基金项目:国家自然科学基金项目（41473115，41977274）；陕西省重点研发计划重点项目（2018ZDXM-SF-022） |
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| 摘要点击次数: 1563 |
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| 中文摘要: |
| 为了研究外源水杨酸（SA）对番茄镉（Cd）抗性的影响，在温室水培条件下，测定了SA预处理对Cd胁迫下番茄生长、Cd积累、根系活性氧和抗氧化酶系统的影响。结果表明，随着Cd胁迫浓度升高，番茄生长受到的抑制作用也加剧。用100 μmol·L-1的SA预处理可显著缓解Cd对番茄的毒害作用。在5 mg·L-1 Cd处理下，加SA预处理组的株高和根长相比无SA处理组分别增加了10.2%和14.2%，根、茎和叶的干质量分别增加了40%、27.2%和24%（P<0.05）。同时，SA处理也显著降低了Cd胁迫下丙二醛（MDA）的含量并提高了抗氧化酶的活性。此外，SA预处理后，番茄地上部Cd积累降低了24.4%~58.3%，根部Cd积累降低了50.5%~75.5%（P<0.05）。研究表明，100 μmol·L-1 SA预处理可以显著缓解Cd胁迫对番茄的生长毒害作用，并降低植株Cd积累。 |
| 英文摘要: |
| This study investigated the effect of exogenous salicylic acid(SA)on tomato plants'resistance to cadmium(Cd)stress under greenhouse hydroponic conditions, and evaluated tomato plant growth, Cd accumulation, root reactive oxygen species, and antioxidant enzyme system after exposing tomatoes to Cd after pretreatment with SA. The results showed that the inhibition of Cd on tomato growth was aggravated with increased Cd concentrations. However, pretreatment with 100 μmol·L-1 SA significantly attenuated the toxicity of Cd on tomato plants. Following SA pretreatment, the plant height and root length of the tomato plants exposed to 5 mg·L-1 Cd increased by 10.2% and 14.2%, respectively, and the dry weight of the roots, stems, and leaves increased by 40%, 27.2%, and 24%, respectively(P<0.05). Meanwhile, SA significantly reduced the content of malondialdehyde(MDA)and increased the activity of antioxidant enzymes of the tomato plants exposed to Cd. In addition, after SA pretreatment, the Cd accumulation in tomato shoots decreased by between 24.4% to 58.3%, and by between 50.5% to 75.5% in the roots(P<0.05). This study shows that 100 μmol·L-1 SA pretreatment can significantly alleviate the toxicity of Cd stress and reduce the Cd accumulation in tomato plants. |
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