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根施水杨酸对铅胁迫下小麦根系生长发育的影响 预览

Effects of root-applying salicylic acid on the growth and development of wheat roots under lead stress
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摘要 以小麦品种“轮选988”为材料,采用溶液培养法,研究了80mg·L^-1水杨酸(SA)对铅(50mg·L-1Pb^2+)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(O2^—·)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。 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(NO 3 ) 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 O2 ^-· and H 2 O 2 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.
作者 巴青松 宋瑜龙 张兰兰 李桂萍 刘远 陈楚 傅兆麟 BA Qing-song;SONG Yu-long;ZHANG Lan-lan;LI Gui-ping;LIU Yuan;CHEN Chu;FU Zhao-lin(College of Life Science, Huaibei Normal University, Anhui Key Laboratory of Plant Resourcesand Biology,Huaibei, Anhui 235000, China;Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi 712100, China)
出处 《干旱地区农业研究》 CSCD 北大核心 2019年第1期208-213,共6页 Agricultural Research in the Arid Areas
基金 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).
关键词 铅胁迫 小麦根系 根施水杨酸 生理特性 lead stress wheat root system root-applying salicylic acid physiological characteristics
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