TY  - JOUR
A1  - Kierzkowski, Daniel
A1  - Lenhard, Michael
A1  - Smith, Richard
A1  - Kuhlemeier, Cris
T1  - Interaction between meristem tissue layers controls phyllotaxis
JF  - Developmental cell
N2  - Phyllotaxis and vein formation are among the most conspicuous patterning processes in plants. The expression and polarization of the auxin efflux carrier PIN1 is the earliest marker for both processes, with mathematical models indicating that PIN1 can respond to auxin gradients and/or auxin flux. Here, we use cell-layer-specific PIN1 knockouts and partial complementation of auxin transport mutants to examine the interaction between phyllotactic patterning, which occurs primarily in the L1 surface layer of the meristem, and midvein specification in the inner tissues. We show that PIN1 expression in the L1 is sufficient for correct organ positioning, as long as the L1-specific influx carriers are present. Thus, differentiation of inner tissues can proceed without PIN1 or any of the known polar transporters. On theoretical grounds, we suggest that canalization of auxin flux between an auxin source and an auxin sink may involve facilitated diffusion rather than polar transport.
Y1  - 2013
U6  - https://doi.org/10.1016/j.devcel.2013.08.017
SN  - 1534-5807
SN  - 1878-1551
VL  - 26
IS  - 6
SP  - 616
EP  - 628
PB  - Cell Press
CY  - Cambridge
ER  -