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On the Cover: Multiple MONOPTEROS-Dependent Pathways Are Involved in Leaf Initiation
In this issue, Schuetz et al. (pp. 870–880) show that monopteros pin-formed1 double mutant seedlings or monopteros seedlings germinated in the presence of an auxin efflux inhibitor generate an unprecedented type of abnormal shoot apical meristem development that not only completely obstructs the formation of lateral organs but also vastly expands the shoot apex. This synergistic effect suggests that MONOPTEROS promotes leaf initiation in part through pathways independent of efflux-mediated auxin transport. The picture shows the meristem region of a monopteros seedling 4 d after germination on growth media supplemented with 10 μM 1-N-naphthylphthalamic acid. This image shows limited growth of cells immediately surrounding the meristem and the initiation of extensive growth from the meristem. With time, the growth of the meristem in the absence of leaf formation will result in large leafless dome structures. Scanning electron micrograph by M. Schuetz.