ETT, IND, BP, RPL and SEU activity is conserved between Arabidopsis and B. rapa. (A,B) B. rapa R-o-18 wild-type plant (A) and colour-coded gynoecium (B): cyan, stigma; pink, style; green, valves; red, valve margin; orange, replum. (C-I) SEM images of gynoecium tops (left) and optical microscopy images of whole gynoecium (right) of wild-type R-o-18 (C) and brett.a (D), brett.b (E), brind (F), brbp (G), brrpl.a/brrpl.c (H) and brseu (I) mutants. Insets are SEM images of apical view of gynoecium tops. (J) Valve-margin defects in brind mutant (right, asterisks) compared to wild-type R-o-18 (left, asterisks). (K) Pedicel defects with horizontal orientation of fruits in brbp mutant (right) compared to wild-type R-o-18 (left). (L) Replum defect in brrpl.a/brrpl.c double mutant (right, arrowhead), compared to wild-type R-o-18 (left, arrowhead). Scale bars: 200 µm in SEM images in C-I, 100 µm in SEM images in J and K, 1 mm in optical microscope images.