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首页> 外文OA文献 >Nitrogen Source Differently Regulates Barley (Hordeum vulgare) Response to NaCl Stress At Seed Germination and Early Seedling Development Stages
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Nitrogen Source Differently Regulates Barley (Hordeum vulgare) Response to NaCl Stress At Seed Germination and Early Seedling Development Stages

机译：氮源在种子萌发和幼苗早期阶段不同地调节大麦（大麦）对NaCl胁迫的响应

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摘要

Nitrogen (N) acts as nutrient and signaling molecule in plants all over their development stages. The involvement of various N forms in the regulation of seed germination response to salt stress was assessed in the present work. Nitrogen sources (NO, NO, NO, NH, glutamine and glutamate) were added at 1mMto the germination medium of barley (Hordeum vulgare, cv Ardhaoui) in combination or not with NaCl stress (14 g.L). The application of nitrogen monoxide (NO) alleviated by about 20% the NaCl-induced germination capacity decrease. However, the addition of ammonium ions (NH) and glutamic acid (Glu) accentuated the inhibitory effects of NaCl, decreasing germination capacity by about 50% compared to the control. The levels of malondialdehyde (MDA), which is an indicator of membrane lipid peroxidation by stresses, were increased by salinity in seeds treated with nitrite (NO), NO, Glu and Gln. In N-free medium, NaCl stress induced a severe nitrate reductase activity (NR, EC 1.6.1.6) inhibition. Such an effect was alleviated by the application of N treatments. Glutamate dehydrogenase (GDH, EC 1.4.1.2) aminating activity (NADH-GDH) of seedlings was inhibited by NaCl stress in the presence of NO, Glu and Gln. Conversely, there was stimulation by salt stress of NADH-GDH activity in seedlings treated with NaCl and NH. Deaminating GDH activity (NAD-GDH) was found to be enhanced by salt stress in NO and NO treatments. The differential effects of applied N forms on germination and early seedling development processes in this grass probably underlines different regulatory actions within N mobilization and assimilation.
机译：氮（N）在植物的整个发育阶段均作为营养物质和信号分子。在本工作中评估了各种氮素形式参与调节种子萌发对盐胁迫的反应。将氮源（NO，NO，NO，NH，谷氨酰胺和谷氨酸盐）以1mM的浓度添加到大麦（大麦，Cv Ardhaoui）的发芽培养基中，无论是否结合NaCl胁迫（14 g.L）。一氧化氮（NO）的使用减少了NaCl诱导的发芽能力下降约20％。但是，铵离子（NH）和谷氨酸（Glu）的加入增强了NaCl的抑制作用，与​​对照相比，发芽能力降低了约50％。盐度提高了用亚硝酸盐（NO），NO，Glu和Gln处理过的种子中丙二醛（MDA）的水平，该水平是应力引起的膜脂质过氧化的指标。在无氮培养基中，NaCl胁迫诱导了严重的硝酸盐还原酶活性（NR，EC 1.6.1.6）抑制。通过使用N处理减轻了这种效果。在NO，Glu和Gln的存在下，NaCl胁迫会抑制幼苗的谷氨酸脱氢酶（GDH，EC 1.4.1.2）的胺化活性（NADH-GDH）。相反，盐胁迫刺激了NaCl和NH处理的幼苗中NADH-GDH的活性。在NO和NO处理中，盐胁迫增强了脱氨GDH活性（NAD-GDH）。施氮方式对这种草的发芽和幼苗早期发育过程的不同影响，可能突出了氮的动员和吸收过程中的不同调控作用。

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