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Nitric oxide is involved in nano-titanium dioxide-induced activation of antioxidant defense system and accumulation of osmolytes under water-deficit stress in Vicia faba L.
Ecotoxicology and Environmental Safety ( IF 6.8 ) Pub Date : 2020-01-09 , DOI: 10.1016/j.ecoenv.2019.110152
M Nasir Khan 1 , Mazen A AlSolami 1 , Riyadh A Basahi 1 , Manzer H Siddiqui 2 , Asma A Al-Huqail 2 , Zahid Khorshid Abbas 3 , Zahid H Siddiqui 3 , Hayssam M Ali 2 , Faheema Khan 2
Affiliation  

Nano-titanium dioxide (nTiO2) has been reported to improve tolerance of plants against different environmental stresses by modulating various physiological and biochemical processes. Nitric oxide (NO) has been shown to act as an important stress signaling molecule during plant responses to abiotic stresses. The present work was planned to investigate the involvement of endogenous NO in nTiO2-induced activation of defense system of fava bean (Vicia faba L.) plants under water-deficit stress (WDS) conditions. Water-suffered plants showed increased concentration of hydrogen peroxide (H2O2) and superoxide (O2-) content coupled with increased electrolyte leakage and lipid peroxidation which adversely affected nitrate reductase (NR) activity, chlorophyll content and growth of the plants. However, application of 15 mg L-1 nTiO2 to stressed plants significantly induced NR activity and synthesis of NO which elevated enzymatic and non-enzymatic defense system of the stressed plants and suppressed the generation of H2O2 and O2- content, leakage of electrolytes, and lipid peroxidation. Application of nTiO2, in association with NO, also enhanced the accumulation of osmolytes (proline and glycine betaine) that assisted the stressed plants in osmotic adjustment as witnessed by improved hydration level of the plants. Involvement of NO in nTiO2-induced activation of defense system was confirmed with NO scavenger cPTIO [2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide] which caused recurrence of WDS.

中文翻译:

一氧化氮参与了纳米二氧化钛诱导的抗氧化防御系统的活化和在水分缺乏胁迫下蚕豆中渗透质的积累。

据报道,纳米二氧化钛(nTiO2)通过调节各种生理和生化过程来提高植物对不同环境胁迫的耐受性。一氧化氮(NO)已被证明在植物对非生物胁迫的反应中起着重要的胁迫​​信号分子的作用。目前的工作计划是调查缺水胁迫(WDS)条件下内源性NO在nTiO2诱导的蚕豆(Vicia faba L.)植物防御系统激活中的参与。饱水的植物显示出过氧化氢(H2O2)和超氧化物(O2-)的浓度增加,同时电解质泄漏和脂质过氧化作用增加,这不利地影响了植物的硝酸还原酶(NR)活性,叶绿素含量和生长。然而,15 mg L-1 nTiO2在胁迫植物上的施用显着诱导了NR活性和NO的合成,从而提高了胁迫植物的酶和非酶防御系统,并抑制了H2O2和O2-的产生,电解质的泄漏和脂质过氧化。nTiO2与NO的结合使用还增强了渗透液(脯氨酸和甘氨酸甜菜碱)的积累,这可以帮助受胁迫的植物进行渗透调节,这可通过改善植物的水合水平来证明。NO清除剂cPTIO [2-(4-羧基苯基)-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物]证实了NO参与nTiO2诱导的防御系统激活,这导致WDS复发。
更新日期:2020-01-09
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