| 巴青松,宋瑜龙,张兰兰,李桂萍,刘远,陈楚,傅兆麟.根施水杨酸对铅胁迫下小麦根系生长发育的影响[J].干旱地区农业研究,2019,37(1):208~213 |
| 根施水杨酸对铅胁迫下小麦根系生长发育的影响 |
| Effects of root-applying salicylic acid on the growth and development of wheat roots under lead stress |
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| DOI：10.7606/j.issn.1000-7601.2019.01.29 |
| 中文关键词: 铅胁迫 小麦根系 根施水杨酸 生理特性 |
| 英文关键词:lead stress wheat root system root-applying salicylic acid physiological characteristics |
| 基金项目:安徽省自然科学基金（1708085QC62）；国家自然科学基金（D010506）；安徽省高等学校省级自然科学研究项目(KJ2016A624）；淮北师范大学博士科研启动基金(15600971); 资源植物生物学安徽省重点实验室开放基金（ZYZWSW2014012） |
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| 中文摘要: |
| 以小麦品种“轮选988”为材料，采用溶液培养法，研究了80 mg·L-1水杨酸（SA）对铅（50 mg·L-1 Pb2+）胁迫下小麦幼苗生长及生理特性的影响。结果表明:根施SA后，铅胁迫下的小麦幼苗株高、根长、株鲜重、根鲜重、株干重和根干重较对照(铅胁迫下未根施SA)分别上升了17.67%、24.85%、23.46%、18.69%、18.95%和25.41%，根系超氧化物歧化酶（SOD）、过氧化物酶（POD）、过氧化氢酶（CAT）、抗坏血酸过氧化物酶（APX）活性分别上升了215.73%、98.92%、137.45%和111.47%，根中超氧阴离子（O—[KG-1][JX*3]·[JX-*3]2）和过氧化氢（H2O2）含量分别降低了23.82%和28.99%；同时，根施SA，铅胁迫下小麦根系中可溶性糖含量上升了13.59％，而Pro含量下降了40.11%,根系中丙二醛（MDA）含量降低了16.78％，小麦根系活力增加了694.52%。因此，根施SA在一定程度上提高了小麦根系的抗氧化能力，缓解了铅离子对小麦根系的毒害。 |
| 英文摘要: |
| In order to explore the role of salicylic acid (SA) in alleviating lead (Pb) toxicity on wheat (Triticum aestivum L.), wheat seedlings exposed to 50 mg·L-1 Pb as Pb(NO3)2 were treated with 80 mg·L-1 SA. The physiological and biochemical indexes of wheat seedlings were measured by solution culture method. The results showed that Pb exposure depressed plant growth. However, after root-applying SA, the plant height, root length, fresh and dry weights of plant and root were increased by 17.67%, 24.85%, 23.46%，18.69%，18.95%, and 25.41%, respectively. In addition, SOD, POD, CAT, and APX increased by 215.73%, 98.92%, 137.45%, and 111.47%, respectively. The contents of O—[KG-1][JX*3]·[JX-*3]2 and H2O2 in the roots decreased by 23.82% and 28.99%, respectively. Whereas the contents of soluble sugar increased by 13.59% while the content of proline decreased by 40.11%. The content of MDA in the roots decreased by 16.78% and root activity increased by 694.52% after root-application of SA under Pb stress. Therefore, root-applying SA significantly improved the antioxidation capability of wheat roots, which could, in turn, enhance the resistance of wheat roots to Pb stress and alleviate Pb toxic effects. |
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