NRP1 and Infertility: The weak mutant allele bri1-119, displays a pleiotropic phenotype including infertility, small dark green rosettes, inward curled leaves, and extra axillary inflorescences33, which was alleviated in the nrp1-1 nrp2-2 background (Supplementary Fig. 1a), further supporting the overexpression of BSU1 upon loss of NRP proteins.