![]() ![]() ![]() In strong wus mutants, SAM development during embryogenesis is defective, with the CZ occupied by cells that are larger and more vacuolated than the normal meristem cells. In Arabidopsis, maintenance of the stem cells in the CZ requires WUSCHEL ( WUS), which encodes a homeodomain protein ( Laux et al. In the SAM, stem cells reside in the meristem central zone (CZ), which regularly provides new cells to replenish the peripheral zone (PZ), where new organs are initiated ( Gross-Hardt and Laux 2003). Within the shoot apical meristem (SAM), a small group of centrally located, slowly dividing stem cells is the ultimate source of all meristem cells and therefore all new shoot organs ( Stewart and Dermen 1970). Plants generate new organs and tissues reiteratively at the meristems, which are groups of undifferentiated, actively dividing cells present in the growing apices and in axillary buds ( Weigel and Jürgens 2002). ![]()
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