Abstract

Under Both Steady-State and Flecked Irradiance, Nitrogen Can Reduce the Inhibition of Photosynthesis Caused by High Temperature Stress.

Author(s): Tim Jason

One of the most vital nutrients for plants, nitrogen, is directly linked to photosynthesis. Under steady-state and flecked irradiance, high temperature stress severely reduces photosynthesis. Nitrogen's potential to mitigate the decline in photosynthesis brought on by high temperatures, particularly when exposed to flecked light, is unknown. In the current work, rice plants were used in a pot experiment with two nitrogen (N) sources, and the steady-state and dynamic photosynthetic rates were determined at 28 and 40°C. Under conditions of high N supply (HN), high temperatures considerably enhanced leaf hydraulic conductance (Kleaf), but not under conditions of low N supply (LN). Under HN, the higher Kleaf kept the leaf water potential (leaf) and steady-state stomatal conductance (gs,sat) constant, but under high temperatures, the leaf and gs, sat were significantly reduced. The temperature in LN circumstances. Because of this, steady-state photosynthesis (Asat) under high temperatures in the LN conditions decreased more drastically. High temperatures considerably slowed down photosynthesis after switching from low to high light, which increased carbon loss under flecked irradiance. So, less so than with LN supply, these results were attained with HN supply. The inhibition of photosynthesis brought on by high temperature stress can therefore be alleviated by nitrogen under both steady-state and flecked irradiance