Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtze River), Ministry of Agriculture/Microelement Research Center/College of Resources and Environment , Huazhong Agricultural University , Wuhan , Hubei 430070 , People's Republic of China.
Institute of Applied Plant Nutrition , University of Göttingen , Carl-Sprengel-Weg 1 , 37075 Göttingen , Germany.
J Agric Food Chem. 2018 May 23;66(20):5125-5132. doi: 10.1021/acs.jafc.8b01135. Epub 2018 May 9.
The inhibition of the net CO assimilation ( A) during photosynthesis is one of the major physiological effects of both nitrogen (N) and potassium (K) deficiencies on rice growth. Whether the reduction in A arises from a limitation in either the diffusion and biochemical fixation of CO or photochemical energy conversion is still debated in relation to N and K deficiencies. In this study, the gas exchange parameters of rice under different N and K levels were evaluated and limitations within the photosynthetic carbon capture process were quantified. A was increased by 17.3 and 12.1% for the supply of N and K, respectively. The suitable N/K ratio should be maintained from 1.42 to 1.50. The limitation results indicated that A is primarily limited by the biochemical process. The stomatal conductance ( L), mesophyll conductance ( L), and biochemical ( L) limitations were regulated by 26.6-79.9, 24.4-54.1, and 44.1-75.2%, respectively, with the N and K supply.
光合作用过程中净 CO2 同化（A）的抑制是氮（N）和钾（K）缺乏对水稻生长的主要生理影响之一。在与 N 和 K 缺乏有关的情况下，A 的减少是否是由于 CO 的扩散和生化固定或光化学能量转换的限制引起的，这仍然存在争议。在这项研究中，评估了不同 N 和 K 水平下水稻的气体交换参数，并量化了光合作用碳捕获过程中的限制。N 和 K 的供应分别使 A 增加了 17.3%和 12.1%。应维持合适的 N/K 比从 1.42 到 1.50。限制结果表明，A 主要受到生化过程的限制。气孔导度（L）、叶肉导度（L）和生化导度（L）的限制分别由 N 和 K 的供应调节 26.6-79.9%、24.4-54.1%和 44.1-75.2%。
