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. 2016 Dec 5;173(1):36–46. doi: 10.1104/pp.16.01523

Figure 2.

Figure 2.

Spatially distinct roles of SPL genes in the Arabidopsis SAM. Left, Two closely related genes, SPL9 and SPL15, are expressed before floral induction in leaves and the SAM, respectively. SPL9 is expressed in leaves, where, in adult plants after reduction in miR156, it participates in the accumulation of miR172 to promote the transition to adult leaf morphology. Middle, During floral induction under short days, the accumulation of miR172 and mRNA of the floral activator FUL at the SAM requires the function of SPL15. During and after floral induction, SPL9 mRNA appears on the flanks of the meristem and the protein activates the floral identity gene AP1 in cooperation with DELLA and LFY. SPL3, SPL4, and SPL5 mRNAs are expressed at the shoot apex. Right, After floral induction, SPL15 is expressed in the floral meristem and the inflorescence meristem. SPL3, SPL4, and SPL5 are expressed in specific patterns at the apex. See text for references.