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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >PEP-Carboxylase Activity: A Comparison of its Role in a C-4 and a C-3 Species Under Salt Stress
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PEP-Carboxylase Activity: A Comparison of its Role in a C-4 and a C-3 Species Under Salt Stress

机译:PEP羧化酶活性:盐胁迫下其在C-4和C-3物种中的作用比较

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P>In our experiments, we found an increase of PEP-carboxylase activity in young shoots of maize under salt stress. Within this study, several analyses were carried out to identify the function of this enhanced enzyme activity during salt stress. In our first experiment, we analysed plants of the salt-resistant maize hybrid SR 03 (Zea mays L.), whereas in the second experiment, we compared maize and wheat (Triticum aestivum L. cv. Thasos), which were grown under two different light intensities for 20 days. In the saline treatments, NaCl was applied up to 100 mm, while control plants grew under non-saline conditions (1 mm NaCl). Analyses of shoot fresh weight revealed a comparable reduction for both genotypes and suggested salt resistance at a similar level. Analyses of sugar concentrations showed an increase in the saline treatment for both genotypes independent of the light intensity. Results for sucrose concentrations led to the conclusion that an increase in PEP-carboxylase activity was not required for sugar metabolism. Independent of light intensity, alkalinity and malate concentrations were decreased only in wheat. It can be concluded that an enhancement of PEP-carboxylase activity in young shoots of maize supports organic acid metabolism under salt stress.
机译:P>在我们的实验中,我们发现盐胁迫下玉米幼芽中PEP-羧化酶活性的增加。在这项研究中,进行了一些分析,以鉴定盐分胁迫期间这种增强的酶活性的功能。在我们的第一个实验中,我们分析了耐盐玉米杂交种SR 03(Zea mays L.)的植物,而在第二个实验中,我们比较了在两个条件下生长的玉米和小麦(Triticum aestivum L. cv。Thasos)不同的光强度持续20天。在盐水处理中,施用NaCl的最大长度为100 mm,而对照植物则在非盐碱条件下生长(1 mm NaCl)。枝条鲜重的分析显示两种基因型均具有相当的降低,并显示出相似的耐盐性。糖浓度分析显示,两种基因型的盐处理量均增加,与光强度无关。蔗糖浓度的结果得出结论,糖代谢不需要增加PEP-羧化酶活性。与光强度无关,仅在小麦中碱度和苹果酸浓度降低。可以得出结论,玉米幼芽中PEP羧化酶活性的增强支持盐胁迫下的有机酸代谢。

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