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首页> 外文期刊>Physiology and Molecular Biology of Plants >Low nitrogen stress regulates chlorophyll fluorescence in coordination with photosynthesis and Rubisco efficiency of rice
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Low nitrogen stress regulates chlorophyll fluorescence in coordination with photosynthesis and Rubisco efficiency of rice

机译：低氮胁迫调节叶绿素荧光与米饭的光合作用和Rubisco效率协调

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摘要

Nitrogen (N) is the basis of plant growth and development and, is considered as one of the priming agents to elevate a range of stresses. Plants use solar radiations through photosynthesis, which amasses the assimilatory components of crop yield to meet the global demand for food. Nitrogen is the main regulator in the allocation of photosynthetic apparatus which changes of the photosynthesis (P-n) and quantum yield (F-v/F-m) of the plant. In the present study, dynamics of the photosynthetic establishment, N-dependent relation with chlorophyll fluorescence attributes and Rubisco efficacy was evaluated in low-N tolerant (cv. CR Dhan 311) and low-N sensitive (cv. Rasi) rice cultivars under low-N and optimum-N conditions. There was a decrease in the stored leaf N under low-N condition, resulting in the decreased P-n and F-v/F-m efficiency of the plants through depletion in the activity and content of Rubisco. The P-n and F-v/F-m followed the parallel trend of leaf N content during low-N condition along with depletion of intercellular CO2 concentration and overall conductance under low-N condition. Photosynthetic saturation curve cleared abrupt decrease of effective quantum yield in the low-N sensitive rice cultivar than the low-N tolerant rice. Also, the rapid light curve highlighted the unacclimated regulation of photochemical and non-photochemical quenching in the low-N condition. The low-N sensitive rice cultivar triumphed non-photochemical quenching, whereas the low-N tolerant rice cultivar rose gradually during the light curve. Our study suggested that the quantum yield is the key limitation for photosynthesis in low-N condition. Regulation of Rubisco, photochemical and non-photochemical quenching may help plants to grow under low-N level.
机译：氮（N）是植物生长和发育的基础，并且被认为是升高一系列压力的引发剂之一。植物通过光合作用使用太阳辐射，这使得农作物产量的同化组成部分来满足全球对食物的需求。氮是主要调节剂在分配光合仪的分配中，该光合仪（P-N）和植物的量子产率（F-V / F-M）的变化。在本研究中，在低N耐受性（CV.CR DHAN 311）和低N敏感（CV.RASI）水稻品种，在低N耐受性（CV.CR DHAN 311）和低N敏感（CV.RASI）水稻品种下评估了光合建立的动力学，与叶绿素荧光属性和鲁维菌科疗效的关系，低于低N -N和最佳条件。在低N条件下储存的叶片N有减少，导致植物的P-N和F-V / F-M通过Rubisco的活性和含量的耗尽降低。 P-N和F-V / F-M在低N条件下跟随叶N含量的平行趋势，并且在低N条件下的细胞间CO2浓度和整体电导的耗尽。光合饱和度曲线清除了低N敏水稻品种的有效量子产量的突然降低而不是低N耐受米饭。此外，快速光曲线突出了低N条件下光化学和非光化学猝灭的无杂化调节。低N敏水稻品种胜利非光化学淬火，而低N耐药稻品种在光线曲线期间逐渐升高。我们的研究表明，量子产量是低n条件下光合作用的关键限制。 Rubisco的调节，光化学和非光化学猝灭可能有助于植物在低N水平下生长。

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