An Arabidopsis rbcs1a rbcs2b mutant (double mutant 1a2b) was generated by crossing T-DNA insertion lines GABI_608F01 (At1g67090) and GABI_324A03 (At5g38420). The 1a3b mutant (GABI_608F01 (At1g67090); SALK_117835 (At5g38410)) was provided by Hiroyuki Ishida, Department of Applied Plant Science, Tohoku University, Japan.