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Development of female flower parts in ‘Gewurztraminer’ cuttings: (A) stage 12, sporogenous tissue; (B) stage 15, archespore; (C) stage 17, macrospore mother cell; and (D) stage 23, embryo sac. Arrows in C and D indicate starch grains. ES, Embryo sac; et, external tegument; f, funicle; it, internal tegument; MMC, macrospore mother cell; Nu, nucellus; Oc, ovarian cavity; ST, sporogenous tissue; Tg, tegument. Scale bars = 250 μm.
