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首页> 外文期刊>Plant Growth Regulation >Aluminium Stress Affects Nitrogen Fixation and Assimilation in Soybean (Glycine max L.)
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Aluminium Stress Affects Nitrogen Fixation and Assimilation in Soybean (Glycine max L.)

机译：铝胁迫影响大豆的固氮和同化作用（Glycine max L.）

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摘要

Nitrogen fixation and assimilation in nodules and roots were studied in soybean (Glycine max L.) exposed to different levels of aluminium (Al) stress (0, 50, 200 and 500 μM). Al at 500 μM induced oxidative stress, which became evident from an increase in lipid peroxidation accompanied by a concomitant decline in antioxidant enzyme activities and leghaemoglobin breakdown. Consequently, there was also a reduction in nitrogenase activity. However, the leghaemoglobin levels and nitrogenase activity were unexpectedly found to be higher in nodules when the plants were treated with 200 μM Al. Of the enzymes involved in nitrogen assimilation, the activity of glutamate dehydrogenase-NADH was reduced in nodules under Al stress, but it was significantly higher in roots at 500 μM Al as compared to that in the control. In nodules, the glutamine synthetase/glutamate synthase-NADH pathway, assayed in terms of activity and expression of both the enzymes, was inhibited at >50 μM Al; but in roots this inhibitory effect was apparent only at 500 μM Al. No significant changes in ammonium and protein contents were recorded in the nodules or roots when the plants were treated with 50 μM Al. However, Al at ≥200 μM significantly increased the ammonium levels and decreased the protein content in the nodules. But these contrasting effects on ammonium and protein contents due to Al stress were observed in the roots only at 500 μM Al. The results suggest that the effect of Al stress on nitrogen assimilation is more conspicuous in nodules than that in the roots of soybean plants.
机译：在暴露于不同水平的铝（Al）胁迫（0、50、200和500μM）的大豆（Glycine max L.）中研究了根瘤和根中的固氮和同化作用。 500μM的Al引起氧化应激，这从脂质过氧化作用的增加伴随着抗氧化酶活性的下降和血红蛋白的分解而变得明显。因此，固氮酶活性也降低了。然而，当用200μMAl处理植物后，结节中的血红蛋白血红蛋白水平和固氮酶活性出乎意料地更高。在氮同化酶中，谷氨酸脱氢酶-NADH活性在铝胁迫下结节中降低，但在500μMAl的根中，其显着高于对照。在结节中，通过>两种酶的活性和表达分析的谷氨酰胺合成酶/谷氨酸合成酶-NADH途径在> 50μMAl时被抑制；但在根部，这种抑制作用仅在500μMAl时才明显。用50μMAl处理植物后，结节或根中铵和蛋白质含量均未见明显变化。但是，≥200μM的Al会显着增加铵水平，并降低结核中的蛋白质含量。但是，仅在500μMAl的根部才观察到由于Al胁迫而对铵和蛋白质含量产生的这些相反影响。结果表明，铝胁迫对大豆根部氮同化的影响比大豆根部更明显。

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