Enhancing photosynthesis and yield in rice with improved N use efficiency

Amane Makino, Yuji Suzuki, Keiki Ishiyama

Plant Science; Volume 325, December 2022, 111475

https://doi.org/10.1016/j.plantsci.2022.111475

Rice overproducing Rubisco showed increased yields with improved N use efficiency. Akita 63 had high yield by enlarging the sink capacity without source improvement. Developing rice with both high photosynthesis and large sink capacity is essential.

Figure: N use efficiency.

Abstract

The success of the dwarf breeding of rice, called the Green Revolution in Asia, resulted from increased source and sink capacities depending on significant inputs of N fertilizer. Although N fertilization is essential for increasing cereal production, large inputs of N application have significantly impacted the environment. Transgenic rice overproducing Rubisco has demonstrated increased yields with improved N use efficiency for increasing biomass production under high N fertilization in a paddy field. A large grain cultivar, Akita 63, had a high yield by enlarging the sink capacity without photosynthesis improvement. However, source capacity strongly limited the yield potential under high N fertilization. Enhancing photosynthesis is important for further increasing the yield of current high-yielding cultivars. Developing innovative rice plants with both high photosynthesis and large sink capacity is essential.

See https://www.sciencedirect.com/science/article/abs/pii/S0168945222003004#!