1A) after the production of some leaves by the SAM, the growth of the primary shoot is terminated by the initiation of the first inflorescence, which is displaced from its terminal position by activation of the meristem at the axil of the last initiated leaf. Tomato exhibits a sympodial growth pattern ( Fig. By contrast, the homologous SELF- PRUNING ( SP) gene of tomato ( Solanum lycopersicum)-which together with CEN and TFL1 defines the CETS gene family ( Pnueli et al., 1998, 2001)-might have a different function because the sp mutation does not alter inflorescence structure, but rather changes whole plant architecture ( Yeager, 1927 MacArthur, 1932). Consistent with this role, both genes are expressed at high level in the inflorescence SAM and their mutation converts the SAM into a terminal flower. During flowering, the CENTRORADIALIS ( CEN) gene of Antirrhinum majus and its homolog TERMINAL FLOWER1 ( TFL1) in Arabidopsis ( Arabidopsis thaliana) are required to maintain inflorescence identity of the shoot apical meristem (SAM) while flower meristems are produced on its flanks ( Bradley et al., 1996, 1997).
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