... transport as an ancestral branch regulator of vascular plants. We show that short-range auxin transport out of the apices promotes dichotomy and that branch dominance is globally coordinated by long-range auxin transport. Uniquely in Selaginella , angle meristems initiate at each dichotomy, and these can...

... regeneration in Arabidopsis thaliana and tomato grafts. Leaves were crucial for this effect, as blocking auxin transport or mutating PHYTOCHROME INTERACTING FACTOR 4 ( PIF4 ) or YUCCA2/5/8/9 in the cotyledons abolished the temperature enhancement. However, these perturbations did not affect grafting at ambient...

... enable auxin reflux and increase total root-tip auxin. We conclude that auxin fluxes through plasmodesmata modify the auxin distribution created by efflux and influx carriers. We first simulated a model of carrier-mediated auxin transport and auxin-mediated DII-VENUS degradation (as developed by Band...

...Michael Sauer; Jürgen Kleine-Vehn ABSTRACT The phytohormone auxin influences virtually all aspects of plant growth and development. Auxin transport across membranes is facilitated by, among other proteins, members of the PIN-FORMED (PIN) and the structurally similar PIN-LIKES (PILS) families, which...

... is required for proper PIN3 phosphorylation and for auxin transport-dependent tropic growth. Polybasic motifs are also present at a conserved position in other D6PK-related kinases and required for membrane and phospholipid binding. Thus, phospholipid-dependent recruitment to membranes through polybasic...

.... Here, we develop a detailed model of auxin transport in the Arabidopsis root tip and combine this with experiments to investigate the processes generating auxin asymmetry during halotropism. Our model points to the key role of root tip architecture in allowing the decrease in PIN2 at the salt-exposed...

... in heterologous yeast and tobacco-leaf auxin-transport systems demonstrate that DGT negatively regulates PIN-FORMED (PIN) auxin efflux transporters by affecting their plasma membrane localization. Studies in tomato support complex effects of the dgt mutation on PIN expression level, expression domain and plasma...

... transport. This MONOPTEROS-dependent transcriptional regulation of auxin influx (AUX1, LAX1 and LAX2) and auxin efflux (PIN1 and PIN4) carriers by MONOPTEROS helps to maintain proper auxin transport to the root tip. These results indicate that auxin-dependent cell specification during embryo development...

... crosstalk by demonstrating that the auxin transport-regulatory protein kinase WAG2 is a crucial transcription target during apical hook opening downstream from GA signaling. We further show that WAG2 is directly activated by PHYTOCHROME INTERACTING FACTOR 5 (PIF5), a light-labile interactor of the DELLA...

... and shoot growth in Arabidopsis . In the shoot, COP1 regulates shoot-to-root auxin transport by controlling the transcription of the auxin efflux carrier gene PIN - FORMED1 ( PIN1 ), thus appropriately tuning shoot-derived auxin levels in the root. This in turn directly influences root elongation and adapts...

..., pin3 and pin7 , which are defective in auxin influx and efflux proteins, were less sensitive to the inhibition of lateral root formation and stimulation of auxin transport following treatment with the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC). By contrast, pin2 and abcb19 mutants...

... and mechanism of action are poorly understood. Here we show that the branching phenotype of mutants in the Arabidopsis P450 family member, MAX1 , can be fully rescued by strigolactone addition, suggesting that MAX1 acts in SL synthesis. We demonstrate that SLs modulate polar auxin transport to control branching...

... is involved in the hook exaggeration phenotype induced by ethylene. * Author for correspondence ( dominique.vanderstraeten@ugent.be ) Competing interests statement 6 12 2009 © 2010. Apical hook Auxin biosynthesis Auxin transport Ethylene Photomorphogenesis...

... activate ATHB8 gene expression. The biological role of ATHB8 in vein formation and the molecular events that culminate in acquisition of the ATHB8 preprocambial cell state are unknown, but intertwined pathways of auxin transport and signal transduction have been implicated in defining paths of vascular...

...Melina Zourelidou; Isabel Müller; Björn C. Willige; Carola Nill; Yusuke Jikumaru; Hanbing Li; Claus Schwechheimer The phytohormone auxin is a major determinant of plant growth and differentiation. Directional auxin transport and auxin responses are required for proper embryogenesis, organ...

...Jozef Mravec; Martin Kubeš; Agnieszka Bielach; Vassilena Gaykova; Jan Petrášek; Petr Skůpa; Suresh Chand; Eva Benková; Eva Zažímalová; Jiří Friml The signalling molecule auxin controls plant morphogenesis via its activity gradients, which are produced by intercellular auxin transport...

... and tropisms. Here we show that PIN proteins exhibit synergistic interactions,which involve cross-regulation of PIN gene expression in pin mutants or plants with inhibited auxin transport. Auxin itself positively feeds back on PIN gene expression in a tissue-specific manner through an AUX/IAA-dependent...

... also plays a role in post-embryonic development and to clarify its involvement in auxin transport,we have characterised newly isolated weak gnom alleles as well as trans-heterozygotes of complementing strong alleles. These genotypes form a phenotypic series of GNOM activity in post-embryonic...

... transport (PAT) in sem1 mutant shoots, and support models correlating down-regulated knox gene expression and PAT in maize shoots. *Author for correspondence (e-mail: mjscanlo@dogwood.botany.uga.edu ) 18 3 2002 © 2002. 2002 KNOX semaphore1 Leaf development Auxin transport...

... segment of the explants, which would eventually result in the achievement of a steady-state equilibrium in the diffusion process. This expedient enables the diffusion component occurring in the direction opposite to that of the polar auxin transport to be ignored, thus simplifying considerably...