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Figure 2


Fig. 2. Meristem architecture. (A) Transverse section of an Arabidopsis vegetative shoot apex, showing the youngest (P1) and increasingly older (P2 and onward) leaf primordia and meristem (M). Notice the spiral phyllotaxis of leaves around the SAM. (B) Longitudinal section of an Arabidopsis meristem, showing the proximal-distal and adaxial-abaxial axes of leaf primordia relative to the SAM. (C) Scanning electron micrograph (SEM) of an Arabidopsis vegetative SAM, showing the spatial relationship of primordia relative to each other and to the meristem (M). (D) Transverse section of a maize SAM, showing successively older (P1-P4) leaf primordia encircling the SAM. (E) Longitudinal section of a maize SAM, showing the proximal-distal and adaxial-abaxial (Ad/Ab) axes of leaf primordia. Notice the alternate phyllotaxis. (F) SEM of a maize SAM with two leaf primordia. Images in C and F kindly provided by C. Kidner and D. Jackson, respectively.