Effect on seed morphology of Q223L in BRI1-deficient genetic background. The effect of RGA1 and Q223L on seed morphology in the T65d1 mutant and the T65d1/d61-7 double mutant was assessed. RGA1 was introduced to T65d1 and T65d1/d61-7, and the resultant transgenic plants were designated as RGA1/T65d1 and RGA1/T65d1/d61-7. Q223L was also introduced into T65d1 and T65d1/d61-7, and designated as QL/T65d1 and QL/T65d1/d61-7. The vector construct used in RGA1 transgenic plants was the same as that used in Q223L transgenic plants except that the cDNA of Q223L was replaced by RGA1. (A) Photographs of the representative seeds of T65, RGA1/T65d1, and QL/T65d1 (Upper) and d61-7, RGA1/T65d1/d61-7 and QL/T65d1/d61-7 (Lower). (B) The vertical length of the seeds. Each value is the mean of 10 seeds. Asterisks denote statistically significant p-values for the differences measured by a two-tailed t-test. (Error bars = SE).