| 外源亚精胺对As5+胁迫下水稻种子萌发和As吸收积累的影响 |
| 摘要点击 2006 全文点击 647 投稿时间：2019-09-09 修订日期：2019-10-15 |
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| 中文关键词 水稻 砷 亚精胺(Spd) 种子萌发 氧化损伤 |
| 英文关键词 rice arsenic spermidine(Spd) seed germination oxidative damage |
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| 中文摘要 |
| 农田As污染对农作物生长有毒害作用，导致农作物产量降低、品质下降.研究了外源添加亚精胺（Spd）对As5+胁迫下水稻种子萌发和幼苗生长的影响.结果表明，外源添加Spd能够促进As5+胁迫下水稻种子的萌发过程，提高种子的发芽势和发芽率，促进幼苗根系生长.添加Spd可以不同程度地提高As5+胁迫下水稻幼苗和根系中的抗氧化酶系统过氧化氢酶（CAT）、过氧化物酶（POD）和超氧化物歧化酶（SOD）的活性，降低水稻幼芽和根系中的丙二醛（MDA）含量.当As5+浓度为25 μmol·L-1时，添加500μmol·L-1和1000 μmol·L-1 Spd使水稻根系中的MDA含量比对照处理分别降低12.3%和31.3%，水稻幼芽CAT活性分别提高105.1%和101.4%，水稻根系CAT活性分别提高29.9%和57.1%.添加Spd也影响水稻对As的吸收积累.当As5+浓度为25 μmol·L-1时，添加500μmol·L-1和1000 μmol·L-1 Spd导致水稻幼芽As含量与对照相比分别降低69.4%和75.1%，水稻根系As含量分别降低7.6%和24.4%.Spd可以有效地缓解As5+对水稻的毒害作用. |
| 英文摘要 |
| As pollution in farmland has a toxic effect on the growth of crops, which reduces their yield and quality. The effects of exogenous spermidine (Spd) on rice seed germination and seedling growth under As5+ stress were studied. The results showed that exogenous Spd could promote the germination of rice seeds under As5+ stress, improve the germination potential and germination rate of seeds, and promote the growth of seedling roots. The addition of Spd could increase the activity of catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD) of rice seedlings and roots under As5+ stress, and reduce the content of malondialdehyde (MDA) in rice buds and roots. When As5+ concentration was 25 μmol·L-1, adding 500 μmol·L-1 and 1000 μmol·L-1 Spd, MDA content in rice roots was decreased by 12.3% and 31.3% and CAT activity of rice shoots was increased by 105.1% and 101.4%, and CAT activity of rice roots was increased by 29.9% and 57.1%, respectively. The addition of Spd also affected the uptake and accumulation of As in rice. When the concentration of As5+ was 25 μmol·L-1, adding 500 μmol·L-1 and 1000 μmol·L-1 Spd, the concentration of As in rice shoots decreased by 69.4% and 75.1%, and As concentration in rice roots decreased by 7.6% and 24.4%, respectively. Spd could therefore effectively alleviate the toxic effect of As5+ on rice. |
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