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ProGPR1:GUS is specifically expressed in embryo sac during female gametophyte development. (A–D) GUS staining in ovules of ProGPR1:GUS plants at female gametophyte (FG) developmental stages FG 3 (A), FG 4 (B), FG 5-6 (C) and FG 7 (D). Mi, micropylar pole; Ch, chalazal pole; Es, embryo sac; Syn, synergids; Ant, antipodals. (E,F) Seeds at 1 day post anthesis (DPA). (G) Seed at 2 DPA.
