Shoot meristem maintenance is controlled by a GRAS-gene mediated signal from differentiating cells

Stuurman, Joroen; Jäggi, Fabienne; Kuhlemeier, Cris (2002). Shoot meristem maintenance is controlled by a GRAS-gene mediated signal from differentiating cells. Genes & development, 16(17), pp. 2213-2218. Cold Spring Harbor Laboratory Press 10.1101/gad.230702

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Plant shoot development depends on the perpetuation of a group of undifferentiated cells in the shoot apical meristem (SAM). In the Petunia mutant hairy meristem (ham), shoot meristems differentiate postembryonically as continuations of the subtending stem. HAM encodes a putative transcription factor of the GRAS family, which acts non-cell-autonomously from L3-derived tissue of lateral organ primordia and stem provasculature. HAM acts in parallel with TERMINATOR (PhWUSCHEL) and is required for continued cellular response to TERMINATOR and SHOOTMERISTEMLESS (PhSTM). This reveals a novel mechanism by which signals from differentiating tissues extrinsically control stem cell fate in the shoot apex.

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