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Fig. S1 indehiscent (ind) does not rescue the reduced fertility of pollen-pistil incompatibility2 (pop2) and vanguard1 (vgd).

Fig. S2 Effect of pollen tube genotype on seed set in auxin response factor8 (arf8).

Fig. S3 arf8 does not alter IND expression.

Fig. S4 Alignment of protein sequences of all IND and HECATE (HEC) HEC1/2/3-related proteins identified searching various publicly available databases.

Fig. S5 ind does not alter HEC3 expression.

Table S1 Analysis of gibberellin (GA) concentrations in whole flower buds from wildtype (WT) and ind mutants harvested just before anthesis using GC-SIM and di-deuterated internal standards

Table S2 GC-SIM analysis of auxin concentrations in whole flower buds from WT and ind mutants harvested just before anthesis

Methods S1 Additional materials and methods information.