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Fig. 2. jba-1D shoot apical meristem phenotypes. (A) Wild-type inflorescence meristem at the transition to flowering. (B) jba-1D/+ inflorescence meristem that is both taller and wider than normal. (C) jba-1D inflorescence meristem that has split into multiple independent meristems (*), each generating floral meristem primordia on its flanks. (D) Wild-type seedling SAM after 11 days of vegetative growth. (E) Enlarged jba-1D seedling SAM. (F) Mean width and height of Col (n=12) and jba-1D (n=11) SAMs from 11-day-old seedlings. (G) Confocal micrograph of a wild-type mature embryo SAM. (H) Confocal micrograph of an enlarged jba-1D mature embryo SAM. (I) GUS expression from a pSTM::GUS reporter construct in the peripheral region (arrows) of a wild-type seedling SAM. (J) pSTM::GUS expression in a jba-1D seedling delimits two well-defined meristems, while the leaf primordium developing between them is radialized (arrowhead). Scale bars: 80 µm (A-E); 20 µm (G-H).





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