Role of PIN-mediated auxin efflux in apical hook development ofArabidopsis thaliana
Citations Over TimeTop 1% of 2010 papers
Abstract
The apical hook of dark-grown Arabidopsis seedlings is a simple structure that develops soon after germination to protect the meristem tissues during emergence through the soil and that opens upon exposure to light. Differential growth at the apical hook proceeds in three sequential steps that are regulated by multiple hormones, principally auxin and ethylene. We show that the progress of the apical hook through these developmental phases depends on the dynamic, asymmetric distribution of auxin, which is regulated by auxin efflux carriers of the PIN family. Several PIN proteins exhibited specific, partially overlapping spatial and temporal expression patterns, and their subcellular localization suggested auxin fluxes during hook development. Genetic manipulation of individual PIN activities interfered with different stages of hook development, implying that specific combinations of PIN genes are required for progress of the apical hook through the developmental phases. Furthermore, ethylene might modulate apical hook development by prolonging the formation phase and strongly suppressing the maintenance phase. This ethylene effect is in part mediated by regulation of PIN-dependent auxin efflux and auxin signaling.
Related Papers
- → Auxin–Cytokinin Interaction Regulates Meristem Development(2011)660 cited
- → Control of bud activation by an auxin transport switch(2009)372 cited
- → Feedback from Lateral Organs Controls Shoot Apical Meristem Growth by Modulating Auxin Transport(2018)78 cited
- → DAR2 acts as an important node connecting cytokinin, auxin, SHY2 and PLT1/2 in root meristem size control(2013)10 cited
- → Auxin Transport Inhibitors. II. 2-(1-Pyrenol)Benzoic Acid, a Potent Inhibitor of Polar Auxin Transport(1977)18 cited