Plants, Vol. 12, Pages 1614: Effects of OsRCA Overexpression on Rubisco Activation State and Photosynthesis in Maize

Plants, Vol. 12, Pages 1614: Effects of OsRCA Overexpression on Rubisco Activation State and Photosynthesis in Maize

Plants doi: 10.3390/plants12081614

Authors: Yujiao Feng Hao Wu Huanhuan Liu Yonghui He Zhitong Yin

Ribulose–1,5–bisphosphate carboxylase/oxygenase (Rubisco) is the rate–limiting enzyme for photosynthesis. Rubisco activase (RCA) can regulate the Rubisco activation state, influencing Rubisco activity and photosynthetic rate. We obtained transgenic maize plants that overproduced rice RCA (OsRCAOE) and evaluated photosynthesis in these plants by measuring gas exchange, energy conversion efficiencies in photosystem (PS) I and PSII, and Rubisco activity and activation state. The OsRCAOE lines showed significantly higher initial Rubisco activity and activation state, net photosynthetic rate, and PSII photochemical quantum yield than wild–type plants. These results suggest that OsRCA overexpression can promote maize photosynthesis by increasing the Rubisco activation state.