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Auxin: A major regulator of organogenesis

Isabelle Bohn-Courseau

C R Biol 333(4):7 (2010) PMID 20371103

Plant development is characterized by the continuous initiation of tissues and organs. The meristems, which are small stem cell populations, are involved in this process. The shoot apical meristem produces lateral organs at its flanks and generates the growing stem. These lateral organs are arranged in a stereotyped pattern called phyllotaxis. Organ initiation in the peripheral zone of the meristem involves accumulation of the plant hormone auxin. Auxin is transported in a polar way by influx and efflux carriers located at cell membranes. Polar localization of the PIN1 efflux carrier in meristematic cells generates auxin concentration gradients and PIN1 localization depends, in turn, on auxin gradients: this feedback loop generates a dynamic auxin distribution which controls phyllotaxis. Furthermore, PIN-dependent local auxin gradients represent a common module for organ initiation, in the shoot and in the root.

Copyright © 2010 Elsevier Ltd. All rights reserved.

DOI: 10.1016/j.crvi.2010.01.004
Version: za2963e q8zae q8zb9 q8zca q8zd4 q8zec q8zff q8zgd

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