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Nitric Oxide is Required for Aminolevulinic Acid-Induced Salt Tolerance by Lowering Oxidative Stress in Maize (Zea mays)
Journal of Plant Growth Regulation ( IF 4.8 ) Pub Date : 2020-04-30 , DOI: 10.1007/s00344-020-10126-z
Cengiz Kaya , Muhammad Ashraf

Although some investigations show that 5-aminolevulinic acid (ALA) participates in plant stress tolerance, the role of nitric oxide (NO) in ALA-induced improvement in tolerance to salt stress in plants necessitates to be understood. So, a NO scavenger, 0.1 mM 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide potassium salt (cPTIO); was applied jointly with ALA. Of four ALA concentrations tested in a preliminary experiment, 20 mg L−1 was chosen to apply as seed treatment or foliage spray to saline-stressed maize seedlings. Salinity (100 mM NaCl) significantly led to reduction in plant biomass, PSII maximum efficiency (Fv/Fm), total chlorophyll, leaf potassium (K+) and calcium (Ca2+) as well as leaf water potential in both cultivars, but it led to enhanced contents of proline, hydrogen peroxide (H2O2), malondialdehyde (MDA), electrolyte leakage (EL) and leaf sodium (Na+) as well as internal NO and nitric oxide synthase (NOS). ALA treatments improved plant growth, activities of antioxidant enzymes, and leaf Ca2+ and K+, but it led to further increases in leaf NO and NOS activity as well as ALA levels. ALA-induced salt tolerance was completely abolished by cPTIO application by eliminating the internal NO generation. This evidently showed that ALA triggered the synthesis of NO through activation of NOS, which in turn improved salt tolerance of the maize plants.

中文翻译:

通过降低玉米(Zea mays)中的氧化应激,氨基乙酰丙酸诱导的耐盐性需要一氧化氮

尽管一些研究表明 5-氨基乙酰丙酸 (ALA) 参与植物胁迫耐受性,但需要了解一氧化氮 (NO) 在 ALA 诱导的植物盐胁迫耐受性改善中的作用。因此,NO 清除剂,0.1 mM 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide 钾盐 (cPTIO);与 ALA 联合应用。在初步实验中测试的四种 ALA 浓度中,选择 20 mg L-1 作为种子处理或叶面喷雾应用于盐胁迫的玉米幼苗。盐度 (100 mM NaCl) 显着降低植物生物量、PSII 最大效率 (Fv/Fm)、总叶绿素、叶钾 (K+) 和钙 (Ca2+) 以及两个品种的叶水势,但它导致脯氨酸、过氧化氢 (H2O2)、丙二醛 (MDA)、电解质泄漏 (EL) 和叶钠 (Na+) 以及内部 NO 和一氧化氮合酶 (NOS)。ALA 处理改善了植物生长、抗氧化酶的活性以及叶 Ca2+ 和 K+,但它导致叶 NO 和 NOS 活性以及 ALA 水平的进一步增加。通过消除内部 NO 生成,cPTIO 应用完全消除了 ALA 诱导的耐盐性。这显然表明 ALA 通过激活 NOS 触发了 NO 的合成,进而提高了玉米植物的耐盐性。通过消除内部 NO 生成,cPTIO 应用完全消除了 ALA 诱导的耐盐性。这显然表明 ALA 通过激活 NOS 触发了 NO 的合成,进而提高了玉米植物的耐盐性。通过消除内部 NO 生成,cPTIO 应用完全消除了 ALA 诱导的耐盐性。这显然表明 ALA 通过激活 NOS 触发了 NO 的合成,进而提高了玉米植物的耐盐性。
更新日期:2020-04-30
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