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首页> 外文期刊>Plant and Soil >Nitrogen-utilization efficiency during early deficiency after a luxury consumption is improved by sustaining nitrate reductase activity and photosynthesis in cotton plants
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Nitrogen-utilization efficiency during early deficiency after a luxury consumption is improved by sustaining nitrate reductase activity and photosynthesis in cotton plants

机译：通过在棉花植物中维持硝酸还原酶活性和光合作用，提高了奢侈消费后的早期缺乏效率的氮利用效率

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Aims Understanding mechanisms underlying N use efficiency (NUE) after luxury consumption and nitrate deprivation is crucial to crop productivity. The aim was to elucidate the importance of photosynthesis, assimilatory nitrate reduction and N-reserve remobilization to NUE in cotton. Methods Plants were exposed to three conditions in nutrient solution: (a) previous exposure to high nitrate supply (10 mM) for long-term (8 days); (b) nitrate deprivation (NO3- withdrawal) for 8 days followed by (c) an early N-deficiency for 4 days. Results Plants supplied with nitrate excess were able to display increment in shoot NUE related to dry matter gain, whereas photosynthetic N use efficiency did not change, evidencing that excess N per se was not able to improve CO2 assimilation. Nitrate reductase (NR) activity was crucial to remobilize stored nitrate through deprivation phase and free amino acids, total proteins, and chlorophylls were also essential to N-remobilization. High NUE was important to kept high root growth rates throughout deprivation and early deficiency phases. Despite the great decrease in chlorophyll content, PSII and PSI activities were kept stable until the onset of early N-deficiency, when cotton plants displayed high shoot NUE. Conclusions These responses are closely associated with high NR activity and sustaining of photosynthesis, which contribute to N-homeostasis in different nutritional regimes.
机译：旨在理解奢侈品消费和硝酸盐剥夺后依赖N利用效率（NUE）的机制至关重要。目的是阐明光合作用，同化硝酸盐还原和NUE棉花的重要性。方法将植物暴露于营养溶液中的三种条件：（a）以前暴露于长期（8天）的高硝酸盐供应（10 mm）; （b）硝酸盐剥夺（NO 3-撤出）8天，然后是（c）早期的N缺乏4天。结果硝酸盐过量供应的植物能够在与干物质增益相关的芽NUE中显示增量，而光合N使用效率没有改变，证明过量的N本身无法改善CO2同化。硝酸还原酶（NR）活性至关重要，以通过剥夺相和游离氨基酸，总蛋白质和叶绿素对硝酸盐进行重新染色也是N-重复的必需品。高NUE是在剥夺和早期缺乏阶段的高根生长率很重要。尽管叶绿素含量下降，但PSII和PSI活性稳定，直至早期n缺乏，当棉花植物显示出高芽NUE时。结论这些反应与高NR活性密切相关，并且对光合作用的维持，这有助于不同营养制度的N-Hoosostasis。

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