Binds to 23S rRNA in mitochondrion (By similarity). Required for the formation of the proximal region of the ovule primordium during floral organogenesis, thus participating in patterning and growth of ovule. Also regulates the initiation and/or maintenance of integument and embryo sac ontogenesis. Prevents inappropriate cell death in the young ovule. Part of the mitochondrial 50S ribosomal subunit. Mostly expressed in pistils and inflorescences, including floral organs and meristems, and, to a lower extent, in leaves. By brassinosteroid (BR), repressed by the BR biosynthesis inhibitor brassinazole (BRZ). Female-sterility due to abnormal gynoecium and ovule growth and development with highly reduced integuments and collapsed cells in the distal regions of the ovule primordia. Slight reduction in the rate of growth and size of the pistil. Belongs to the universal ribosomal protein uL14 family. Extended N-terminus. Truncated N-terminus.