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Fig. 1. GNOM is expressed during embryonic and post-embryonic development. GUS staining of transgenic GNOM-GUS plants. (A) Mature ovule. (B-D) Embryos at (B) dermatogen, (C) heart and (D) torpedo stages. (E-H) Seedling roots: (E) primary root tip; (F) vascular bundle; note strong difference in staining between vascular bundle and endodermis (arrowhead marks border); (G) young lateral root primordium; (H) emerged lateral root primordium. (I) Cotyledon. (J) Undifferentiated vascular strand. (K) Late rosette leaf. (L) Inflorescence stem segment. (M) Young flower buds. (N-Q) Floral organs: (N) sepal; (O) petal; (P) stamen, note weak GUS signal in mature pollen grains (arrowheads); (Q) gynoecium.