Polar Auxin Transport and Asymmetric Auxin Distribution

Michniewicz, Marta; Brewer, Philip B.; Friml, Jiřı́

doi:10.1199/tab.0108

Cited by 73 publications

(66 citation statements)

References 129 publications

(329 reference statements)

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“…Genetic variation in novel traits that have never, to our knowledge, been described with respect to tomato or Arabidopsis root development were characterized. These include consistent root growth away from the gravity vector that is distinct from agravitropic growth responses (Michniewicz et al, 2007). A "gravitropic set angle" had been previously theoretically proposed (Digby and Firn, 1995), and our data supports the existence of such a growth response that is genetically variable.…”

Section: Discussionsupporting

confidence: 84%

Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato

et al. 2013

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While the Arabidopsis (Arabidopsis thaliana) root has been elegantly characterized with respect to specification of cell identity, its development is missing a number of cellular features present in other species. We have characterized the root development of a wild and a domesticated tomato species, Solanum pennellii and Solanum lycopersicum 'M82.' We found extensive differences between these species for root morphology and cellular development including root length, a novel gravity set point angle, differences in cortical cell layer patterning, stem cell niche structure, and radial cell division. Using an introgression line population between these two species, we identified numerous loci that regulate these distinct aspects of development. Specifically we comprehensively identified loci that regulate (1) root length by distinct mechanisms including regulation of cell production within the meristem and the balance between cell division and expansion, (2) the gravity set point angle, and (3) radial cell division or expansion either in specific cell types or generally across multiple cell types. Our findings provide a novel perspective on the regulation of root growth and development between species. These loci have exciting implications with respect to regulation of drought resistance or salinity tolerance and regulation of root development in a family that has undergone domestication.

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Section: Discussionsupporting

confidence: 84%

Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato

et al. 2013

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“…Auxin export is strictly regulated through PIN (PIN-FORMED) and ABCB-type transporters that are polarly inserted into the plasma membrane on specific sides of the cell to control the direction of auxin transport in acropetal, basipetal, or lateral direction ). In the Arabidopsis thaliana root, auxin transport in the acropetal direction, from the root base to the root tip, is mainly mediated by PIN1, whereas basipetal auxin transport, from the root tip to the elongation zone, is mediated by PIN2 (Rashotte et al, 2000;Michniewicz et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Flavonoids and Auxin Transport Inhibitors Rescue Symbiotic Nodulation in the Medicago truncatula Cytokinin Perception Mutant cre1

et al. 2015

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Initiation of symbiotic nodules in legumes requires cytokinin signaling, but its mechanism of action is largely unknown. Here, we tested whether the failure to initiate nodules in the Medicago truncatula cytokinin perception mutant cre1 (cytokinin response1) is due to its altered ability to regulate auxin transport, auxin accumulation, and induction of flavonoids. We found that in the cre1 mutant, symbiotic rhizobia cannot locally alter acro-and basipetal auxin transport during nodule initiation and that these mutants show reduced auxin (indole-3-acetic acid) accumulation and auxin responses compared with the wild type. Quantification of flavonoids, which can act as endogenous auxin transport inhibitors, showed a deficiency in the induction of free naringenin, isoliquiritigenin, quercetin, and hesperetin in cre1 roots compared with wild-type roots 24 h after inoculation with rhizobia. Coinoculation of roots with rhizobia and the flavonoids naringenin, isoliquiritigenin, and kaempferol, or with the synthetic auxin transport inhibitor 2,3,5,-triiodobenzoic acid, rescued nodulation efficiency in cre1 mutants and allowed auxin transport control in response to rhizobia. Our results suggest that CRE1-dependent cytokinin signaling leads to nodule initiation through the regulation of flavonoid accumulation required for local alteration of polar auxin transport and subsequent auxin accumulation in cortical cells during the early stages of nodulation.

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“…The capability of a simple signal to trigger a complex and oriented cellular response such as that of vascular strand formation suggests that the underlying mechanism recruits directional cues already present in the organism. Because in the plant auxin is synthesized predominantly in young apical regions, such as leaf primordia and floral buds, and transported basally (Michniewicz et al 2007), the source of asymmetric information co-opted by the auxin-induced vascular differentiation response probably coincides with the polar flow of auxin itself. This brief review summarizes and integrates the findings of a recent group of studies that together have generated a conceptual framework for experimentally exploring functions of auxin transport in leaf vein formation at the cellular and molecular levels.…”

Section: Introductionmentioning

confidence: 99%

Auxin-transport-dependent leaf vein formationThis paper is one of a selection published in a Special Issue comprising papers presented at the 50th Annual Meeting of the Canadian Society of Plant Physiologists (CSPP) held at the University of Ottawa, Ontario, in June 2008.

Donner

Scarpella

2009

Botany

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The formation of vein patterns in leaves has captivated biologists, mathematicians, and philosophers. In leaf development, files of vein-forming procambial cells emerge from within a seemingly homogeneous subepidermal tissue through the selection of anatomically inconspicuous preprocambial cells. Although the molecular details underlying the orderly formation of veins in the leaf remain elusive, gradually restricted transport paths of the plant signaling molecule auxin have long been implicated in defining sites of vein differentiation. Several recent advances converge to more precisely define the role of auxin flow at successive stages of vascular development. The picture that emerges is that of vein formation as a self-organizing, reiterative, auxin-transport-dependent process.Résumé : La formation des patrons des nervures foliaires a captivé les biologistes, les mathématiciens et les philosophes. Au cours du développement foliaire, des files de cellules procambiales forment des veines émergentes au sein de ce qui semble un tissus sub épidermique homogène, via la sélection de cellules procambiales anatomiquement invisibles. Bien que les détails moléculaires sous-jacents à la formation ordonnée des nervures dans la feuille demeurent insaisissables, on a depuis longtemps impliqué le transport graduellement restreint de la molécule d'auxine responsable de signaux végétaux, dans la définition des sites de différenciation des nervures. Plusieurs percées récentes convergent vers une définition plus précise du rôle du flux d'auxine à différents stades du développement vasculaire. Le tableau qui émerge est celui de la formation des nervures comme un processus auto organisé, réitératif et dépendant de l'auxine.

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Polar Auxin Transport and Asymmetric Auxin Distribution

Cited by 73 publications

References 129 publications

Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato

Identification of Novel Loci Regulating Interspecific Variation in Root Morphology and Cellular Development in Tomato

Flavonoids and Auxin Transport Inhibitors Rescue Symbiotic Nodulation in the Medicago truncatula Cytokinin Perception Mutant cre1

Auxin-transport-dependent leaf vein formationThis paper is one of a selection published in a Special Issue comprising papers presented at the 50th Annual Meeting of the Canadian Society of Plant Physiologists (CSPP) held at the University of Ottawa, Ontario, in June 2008.

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