Nitrogen can improve the rapid response of photosynthesis to changing irradiance in rice (Oryza sativa L.) plants

作者：Sun, Jiali; Ye, Miao; Peng, Shaobing; Li, Yong^*

来源：Scientific Reports, 2016, 6(1): 31305.

DOI：10.1038/srep31305

• USE EFFICIENCY
• UNIFORM IRRADIANCE
• ACTIVATION STATE
• CO2 ASSIMILATION
• LIGHT
• INDUCTION
• SUNFLECKS
• LEAVES
• ACCUMULATION
• CONDUCTANCE

To identify the effect of nitrogen (N) nutrition on the dynamic photosynthesis of rice plants, a pot experiment was conducted under two N conditions. The leaf N and chlorophyll levels, as well as steady-state photosynthesis, were significantly increased under high N. After the transition from saturating to low light levels, decreases in the induction state (IS%) of leaf photosynthesis (A) and stomatal conductance (g(s)) were more severe under low than under high N supply. After the transition from low to flecked irradiance, the times to 90% of maximum A (T-90%A) were significantly longer under low than under high N supply. Under flecked irradiance, the maximum A under saturating light (A(max-fleck)) and the steady-state A under low light (A(min-fleck)) were both lower than those under uniform irradiance (A(sat) and A(initial)). Under high N supply, A(max-fleck) was 14.12% lower than A(sat), while it was 22.80% lower under low N supply. The higher IS%, shorter T-90%A, and the lower depression of A(max-fleck) from A(sat) under high N supply led to a less carbon loss compared with under a low N supply. Therefore, we concluded that N can improve the rapid response of photosynthesis to changing irradiance.

• 出版日期2016-8-10
• 单位华中农业大学