The Rab Geranylgeranyl Transferase Beta Subunit Is Essential for Embryo and Seed Development in Arabidopsis thaliana

Auxin is a key regulator of plant development affecting the formation and maturation reproductive structures. The apoplastic route auxin transport engages influx efflux facilitators from PIN, AUX ABCB families. polar localization these proteins constant recycling plasma membrane to endosomes dependent on Rab-mediated vesicular traffic. Rab are anchored membranes via posttranslational addition two geranylgeranyl moieties by Geranylgeranyl Transferase enzyme (RGT), which consists RGTA, RGTB REP subunits. Here, we present data showing that seed in rgtb1 mutant, with decreased capacity, disturbed. Both pre- post-fertilization events affected, leading decrease yield. Pollen tube recognition at stigma its guidance micropyle compromised coat forms incorrectly. Excess sporophytic tissues ovule plants leads an increased tendency autonomous endosperm unfertilized ovules influences embryo maternal manner. results show importance traffic for sexual reproduction flowering plants, highlight RGTB1 as component sporophytic-filial signaling.