Growth Physiological Characteristics, and Fluorescence Characteristics of the Light-adapted State of Wheat (<i>Triticum aestivum</i> L.) in Response to Nitrogen Application Levels

This study aims at great influence on yield of winter wheat in some areas of China. Nitrogen (N) application was believed to be able to improve photosynthesis of flag leaf and increase final yield. To understand the response of chlorophyll fluorescence parameters of wheat flag leaf to yunhan-20410 the effect of N fertilization, we carried out a greenhouse experiment from of 2019-2020 using winter wheat cultivar “Yunhan 20410’ ‘Yunhan 618”. The results showed that the maximum chlorophyll content of flag leaves occurred at the booting stage. Under Yunhan-20410 condition, FV/Fm, FV/FO, and qp showed “high-low” variation, and the maximum values were observed between May 5 and May 11. However, Yunhan-20410 at booting stage, FV/Fm, FV/FO, and qp showed “low-high-low” curve. Compared to Yunhan-218, Yunhan-20410 at booting stage significantly decreased FV/Fm, FV/FO, qp, ΦPSII, and NPQ significantly increased.