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首页> 外文期刊>African Journal of Biotechnology >Growth and nitrogen metabolism changes in NaCl-stressed tobacco (Nicotiana rustica L. var. Souffi) seedlings
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Growth and nitrogen metabolism changes in NaCl-stressed tobacco (Nicotiana rustica L. var. Souffi) seedlings

机译：NaCl胁迫烟草（Nicotiana Rusta L. var。Souffi）幼苗的生长和氮代谢变化

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摘要

While salinity?effects have been largely documented in crop plants, little data are available on?Nicotiana rustica?species (snuff tobacco), mainly nitrogen metabolism changes. Here, tobacco (N. rustica?L. var. Souffi) seedlings were grown for one month on control medium, and then exposed for seven days to different levels of salt stress (0, 50, 100 and 200 mM NaCl). A significant decrease in dry weight accumulation was observed only at 200 mM NaCl. Na+?and Cl-?ions accumulation was greater in leaves relative to roots, while growth was similarly decreased in both organs. Referring to roots, leaf water content was less affected by salinity. The increase of endogenous levels of salt ions was accompanied by a drop in NO3-content in both leaves and roots, and a more pronounced decrease in K+?content in leaves. Under salinity, nitrate reductase activity (NR, EC 1.6.1.6) was inhibited in both leaves and roots. The activities of nitrite reductase (NiR, EC 1.7.7.1) and glutamine synthetase (GS, EC 6.3.1.2) were inhibited in leaves but not in roots by salt stress. In stressed seedlings, NH4+?contents, protease activity, aminating and deaminating activities of glutamate dehydrogenase (NADH-GDH and NAD-GDH, EC 1.4.1.2) were enhanced mainly in the leaves. It could be stated that tobacco leaves and roots exhibited similar salt sensitivity in terms of growth and NO3-?assimilation (NR activity), however they showed differential response for salt ions accumulation and NH4+metabolism steps (GS and GDH).
机译：尽管盐碱化作用在农作物中已有大量文献记载，但有关“烟草”（鼻烟）种的数据很少，主要是氮代谢变化。在这里，烟草（N.rustica？L.var.Souffi）幼苗在对照培养基上生长了一个月，然后暴露于不同水平的盐胁迫（0、50、100和200 mM NaCl）中达7天。仅在200 mM NaCl中观察到干重积累的显着减少。 Na +和Cl-离子在叶片中的积累相对于根部更大，而在两个器官中的生长类似地下降。就根而言，盐分对叶片含水量的影响较小。内源性盐离子含量的增加伴随着叶片和根部NO 3含量的下降，以及叶片中K +含量的更明显的下降。在盐度下，叶和根中的硝酸还原酶活性（NR，EC 1.6.1.6）均受到抑制。盐胁迫抑制了叶片中的亚硝酸还原酶（NiR，EC 1.7.7.1）和谷氨酰胺合成酶（GS，EC 6.3.1.2）的活性，但对根部没有抑制作用。在胁迫的幼苗中，谷氨酸脱氢酶（NADH-GDH和NAD-GDH，EC 1.4.1.2）的NH4 +含量，蛋白酶活性，胺化和脱氨活性主要在叶片中增强。可以说，烟叶和根在生长和NO3-同化作用（NR活性）方面表现出相似的盐敏感性，但是它们对盐离子积累和NH4 +代谢步骤（GS和GDH）表现出不同的响应。

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