Guo S, Zhou Y, Shen Q, Zhang F
College of Resources and Environmental Sciences, Nanjing Agricultural University, Tongwei Road 6, Nanjing, 210095, China.
Plant Biol (Stuttg). 2007 Jan;9(1):21-9. doi: 10.1055/s-2006-924541. Epub 2006 Oct 17.
Ammonium and nitrate as different forms of nitrogen nutrients impact differently on some physiological and biochemical processes in higher plants. Compared to nitrate, ammonium results in small root and small leaf area, which may contribute to a low carbon gain, and an inhibition on growth. On the other hand, due to (photo)energy saving, a higher CO (2) assimilation rate per leaf area was observed frequently in plants supplied with ammonium than in those supplied with nitrate. These results were dependent not only on higher Rubisco content and/or activity, but also on RuBP regeneration rate. The difference in morphology such as chloroplast volume and specific leaf weight might be the reason why the CO (2) concentration in the carboxylation site and hence the photorespiration rate differs in plants supplied with the two nitrogen forms. The effect of nitrogen form on water uptake and transportation in plants is dependent both on leaf area or shoot parameter, and on the root activity (i.e., root hydraulic conductivity, aquaporin activity).
铵态氮和硝态氮作为不同形式的氮素营养，对高等植物的一些生理生化过程有着不同的影响。与硝态氮相比，铵态氮会导致根系和叶面积较小，这可能导致碳同化量较低，并抑制生长。另一方面，由于（光）能节约，与供应硝态氮的植物相比，供应铵态氮的植物每叶面积的二氧化碳同化率经常更高。这些结果不仅取决于较高的 Rubisco 含量和/或活性，还取决于 RuBP 再生速率。叶绿体体积和比叶重等形态上的差异，可能是供应两种氮素形态的植物中羧化部位的二氧化碳浓度以及光呼吸速率不同的原因。氮素形态对植物水分吸收和运输的影响，既取决于叶面积或地上部参数，也取决于根系活性（即根水力导度、水通道蛋白活性）。
