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首页> 外文期刊>Asian Journal of Plant Sciences >Changes in Activities of Nitrogen Metabolism Enzymes in Cadmium Stressed Marrow Seedlings
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Changes in Activities of Nitrogen Metabolism Enzymes in Cadmium Stressed Marrow Seedlings

机译：镉胁迫的骨髓幼苗氮代谢酶活性的变化

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摘要

Plants of marrow (Cucurbita pepo L.) were grown in a controlled environmental chamber and were submitted to different concentrations of cadmium (Cd) applied to N0-3~_ the nutrient solution at 0, 10, 20, 30, 40 and 50 uM. The activities of primary nitrogen enzymes as well as ammonium ion contents were investigated in both roots and shoots of marrow seedlings. Toxic cadmium ion accumulation in seedlings significantly modified activity of primary nitrogen assimilating enzymes. There were significant decreases in glutamine synthetase (GS; EC 6.3.1.2), glutamate synthase (GOGAT; EC 1.4.1.13), nitrate reductase (NR; EC 1.6.6.1) and nitrite reductase (NiR; EC 1.6.6.4) activities in both root and shoot of the seedlings. In contrast, the same previous Cd concentrations expressed significant increase in glutamate dehydrogenase (GDH; EC 1.4.1.2) activity in both shoot and root of the same seedlings. Corresponding with the increase in glutamate dehydrogenase activity, ammonium ion contents in shoots of cadmium treated seedlings, showed significant increase with the increase in cadmium concentration. However, ammonium ion contents of roots of the same seedlings, exhibited significant increase up to 30 uM Cd only. These results suggest that, in general, treatment with Cd~(2+) affect nitrogen assimilation and metabolism to a great extent in both roots and shoots of marrow seedlings.
机译：骨髓植物（南瓜属）在受控的环境室内生长，并以0、10、20、30、40和50 uM的浓度向不同浓度的镉（Cd）施入N0-3 。研究了骨髓幼苗的根和芽中主要氮酶的活性以及铵离子的含量。幼苗中有毒镉离子的积累显着改变了主要氮同化酶的活性。谷氨酰胺合成酶（GS; EC 6.3.1.2），谷氨酸合成酶（GOGAT; EC 1.4.1.13），硝酸还原酶（NR; EC 1.6.6.1）和亚硝酸还原酶（NiR; EC 1.6.6.4）的活性均显着下降。幼苗的根和芽。相反，以前相同的Cd浓度表示同一幼苗的芽和根中谷氨酸脱氢酶（GDH; EC 1.4.1.2）活性显着增加。与谷氨酸脱氢酶活性的增加相对应，镉处理的幼苗的芽中的铵离子含量随着镉浓度的增加而显着增加。但是，同一幼苗根部的铵离子含量仅在高达30 uM Cd时才表现出明显的增加。这些结果表明，一般而言，Cd〜（2+）处理对骨髓幼苗的根部和枝条中的氮同化和代谢都有很大影响。

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