| 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 |
| Key Words: lead stress wheat root system root-applying salicylic acid physiological characteristics |
| Author Name | Affiliation | | BA Qing-song | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China | | SONG Yu-long | Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi 712100, China | | ZHANG Lan-lan | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China | | LI Gui-ping | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China | | LIU Yuan | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China | | CHEN Chu | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China | | FU Zhao-lin | College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology，Huaibei, Anhui 235000, China |
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| Abstract: |
| 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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