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Labusch C, Effendi Y, Fulda M, Scherer GFE. Transcription of TIR1-Controlled Genes Can be Regulated within 10 Min by an Auxin-Induced Process. Can TIR1 be the Receptor? FRONTIERS IN PLANT SCIENCE 2016; 7:995. [PMID: 27462327 PMCID: PMC4939301 DOI: 10.3389/fpls.2016.00995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 06/22/2016] [Indexed: 05/30/2023]
Abstract
ABP1 and TIR1/AFBs are known as auxin receptors. ABP1 is linked to auxin responses several of which are faster than 10 min. TIR1 regulates auxin-induced transcription of early auxin genes also within minutes. We use transcription of such TIR1-dependent genes as indicator of TIR1 activity to show the rapid regulation of TIR1 by exogenous auxin. To this end, we used quantification of transcription of a set of fifteen early auxin-induced reporter genes at t = 10 and t = 30 min to measure this as a TIR1-dependent auxin response. We conducted this study in 22 mutants of auxin transporters (pin5, abcb1, abcb19, and aux1/lax3), protein kinases and phosphatases (ibr5, npr1, cpk3, CPK3-OX, d6pk1, d6pkl1-1, d6pkl3-2, d6pkl1-1/d6pkl2-2, and d6pkl1-1/d6pkl3-2), of fatty acid metabolism (fad2-1, fad6-1, ssi2, lacs4, lacs9, and lacs4/lacs9) and receptors (tir1, tir1/afb2, and tir1/afb3) and compared them to the wild type. After 10 min auxin application, in 18 out of 22 mutants mis-regulated expression of at least one reporter was found, and in 15 mutants transcription of two-to-three out of five selected auxin reporter genes was mis-regulated. After 30 min of auxin application to mutant plants, mis-regulation of reporter genes ranged from one to 13 out of 15 tested reporter genes. Those genes chosen as mutants were themselves not regulated in their expression by auxin for at least 1 h, excluding an influence of TIR1/AFBs on their transcription. The expression of TIR1/AFB genes was also not modulated by auxin for up to 3 h. Together, this excludes a feedback or feedforward of these mutant genes/proteins on TIR1/AFBs output of transcription in this auxin-induced response. However, an auxin-induced response needed an as yet unknown auxin receptor. We suggest that the auxin receptor necessary for the fast auxin-induced transcription modulation could be, instead, ABP1. The alternative hypothesis would be that auxin-induced expression of a protein, initiated by TIR1/AFBs receptors, could initiate these responses and that this unknown protein regulated TIR1/AFB activities within 10 min.
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Affiliation(s)
- Corinna Labusch
- Abteilung Molekulare Ertragsphysiologie, Institut für Gartenbauliche Produktionssysteme, Leibniz Universität HannoverHannover, Germany
| | - Yunus Effendi
- Abteilung Molekulare Ertragsphysiologie, Institut für Gartenbauliche Produktionssysteme, Leibniz Universität HannoverHannover, Germany
- Department of Biology, University of Al Azhar IndonesiaJakarta, Indonesia
| | - Martin Fulda
- Abteilung Biochemie der Pflanzen, Albrecht-von-Haller-Institut der Pflanzenwissenschaften, Universität GöttingenGöttingen, Germany
| | - Günther F. E. Scherer
- Abteilung Molekulare Ertragsphysiologie, Institut für Gartenbauliche Produktionssysteme, Leibniz Universität HannoverHannover, Germany
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Effendi Y, Ferro N, Labusch C, Geisler M, Scherer GFE. Complementation of the embryo-lethal T-DNA insertion mutant of AUXIN-BINDING-PROTEIN 1 (ABP1) with abp1 point mutated versions reveals crosstalk of ABP1 and phytochromes. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:403-18. [PMID: 25392478 PMCID: PMC4265171 DOI: 10.1093/jxb/eru433] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The function of the extracytoplasmic AUXIN-BINDING-PROTEIN1 (ABP1) is largely enigmatic. We complemented a homozygous T-DNA insertion null mutant of ABP1 in Arabidopsis thaliana Wassilewskia with three mutated and one wild-type (wt) ABP1 cDNA, all tagged C-terminally with a strepII-FLAG tag upstream the KDEL signal. Based on in silico modelling, the abp1 mutants were predicted to have altered geometries of the auxin binding pocket and calculated auxin binding energies lower than the wt. Phenotypes linked to auxin transport were compromised in these three complemented abp1 mutants. Red light effects, such as elongation of hypocotyls in constant red (R) and far-red (FR) light, in white light supplemented by FR light simulating shade, and inhibition of gravitropism by R or FR, were all compromised in the complemented lines. Using auxin- or light-induced expression of marker genes, we showed that auxin-induced expression was delayed already after 10 min, and light-induced expression within 60 min, even though TIR1/AFB or phyB are thought to act as receptors relevant for gene expression regulation. The expression of marker genes in seedlings responding to both auxin and shade showed that for both stimuli regulation of marker gene expression was altered after 10-20 min in the wild type and phyB mutant. The rapidity of expression responses provides a framework for the mechanics of functional interaction of ABP1 and phyB to trigger interwoven signalling pathways.
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Affiliation(s)
- Yunus Effendi
- Leibniz Universität Hannover, Institut für Gartenbauliche Produktionssysteme, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany Al Azhar Indonesia University, Department of Biology, Sisingamangaraja, Jakarta 12110, Indonesia
| | - Noel Ferro
- University of Bonn, Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, Beringstr. 4, D-53115 Bonn, Germany
| | - Corinna Labusch
- Leibniz Universität Hannover, Institut für Gartenbauliche Produktionssysteme, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Markus Geisler
- University of Fribourg, Department of Biology - Plant Biology, Chemin de Museé 10, CH-1700 Fribourg, Switzerland
| | - Günther F E Scherer
- Leibniz Universität Hannover, Institut für Gartenbauliche Produktionssysteme, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany
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Hawkins C, Liu Z. A model for an early role of auxin in Arabidopsis gynoecium morphogenesis. FRONTIERS IN PLANT SCIENCE 2014; 5:327. [PMID: 25071809 PMCID: PMC4086399 DOI: 10.3389/fpls.2014.00327] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Accepted: 06/23/2014] [Indexed: 05/19/2023]
Abstract
The female reproductive organ of angiosperms, the gynoecium, often consists of the fusion of multiple ovule-bearing carpels. It serves the important function of producing and protecting ovules as well as mediating pollination. The gynoecium has likely contributed to the tremendous success of angiosperms over their 160 million year history. In addition, being a highly complex plant organ, the gynoecium is well suited to serving as a model system for use in the investigation of plant morphogenesis and development. The longstanding model of gynoecium morphogenesis in Arabidopsis holds that apically localized auxin biosynthesis in the gynoecium results in an apical to basal gradient of auxin that serves to specify along its length the development of style, ovary, and gynophore in a concentration-dependent manner. This model is based primarily on the observed effects of the auxin transport blocker N-1-naphthylphthalamic acid (NPA) as well as analyses of mutants of Auxin Response Factor (ARF) 3/ETTIN (ETT). Both NPA treatment and ett mutation disrupt gynoecium morphological patterns along the apical-basal axis. More than a decade after the model's initial proposal, however, the auxin gradient on which the model critically depends remains elusive. Furthermore, multiple observations are inconsistent with such an auxin-gradient model. Chiefly, the timing of gynoecium emergence and patterning occurs at a very early stage when the organ has little-to-no apical-basal dimension. Based on these observations and current models of early leaf patterning, we propose an alternate model for gynoecial patterning. Under this model, the action of auxin is necessary for the early establishment of adaxial-abaxial patterning of the carpel primordium. In this case, the observed gynoecial phenotypes caused by NPA and ett are due to the disruption of this early adaxial-abaxial patterning of the carpel primordia. Here we present the case for this model based on recent literature and current models of leaf development.
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Affiliation(s)
| | - Zhongchi Liu
- Department of Cell Biology and Molecular Genetics, University of Maryland, College ParkMD, USA
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Effendi Y, Radatz K, Labusch C, Rietz S, Wimalasekera R, Helizon H, Zeidler M, Scherer GFE. Mutants of phospholipase A (pPLA-I) have a red light and auxin phenotype. PLANT, CELL & ENVIRONMENT 2014; 37:1626-40. [PMID: 24433169 DOI: 10.1111/pce.12278] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2013] [Accepted: 12/27/2013] [Indexed: 05/13/2023]
Abstract
pPLA-I is the evolutionarily oldest patatin-related phospholipase A (pPLA) in plants, which have previously been implicated to function in auxin and defence signalling. Molecular and physiological analysis of two allelic null mutants for pPLA-I [ppla-I-1 in Wassilewskija (Ws) and ppla-I-3 in Columbia (Col) ] revealed pPLA-I functions in auxin and light signalling. The enzyme is localized in the cytosol and to membranes. After auxin application expression of early auxin-induced genes is significantly slower compared with wild type and both alleles show a slower gravitropic response of hypocotyls, indicating compromised auxin signalling. Additionally, phytochrome-modulated responses like abrogation of gravitropism, enhancement of phototropism and growth in far red-enriched light are decreased in both alleles. While early flowering, root coils and delayed phototropism are only observed in the Ws mutant devoid of phyD, the light-related phenotypes observed in both alleles point to an involvement of pPLA-I in phytochrome signalling.
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Affiliation(s)
- Yunus Effendi
- Leibniz Universität Hannover, Institut für Zierpflanzenbau und Gehölzwissenschaften, Abt. Molekulare Ertragsphysiologie, D-30419, Hannover, Germany
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Kirpichnikova AA, Rudashevskaya EL, Yemelyanov VV, Shishova MF. Ca(2+)-Transport through Plasma Membrane as a Test of Auxin Sensitivity. PLANTS (BASEL, SWITZERLAND) 2014; 3:209-22. [PMID: 27135501 PMCID: PMC4844295 DOI: 10.3390/plants3020209] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Revised: 03/09/2014] [Accepted: 03/13/2014] [Indexed: 11/16/2022]
Abstract
Auxin is one of the crucial regulators of plant growth and development. The discovered auxin cytosolic receptor (TIR1) is not involved in the perception of the hormone signal at the plasma membrane. Instead, another receptor, related to the ABP1, auxin binding protein1, is supposed to be responsible for the perception at the plasma membrane. One of the fast and sensitive auxin-induced reactions is an increase of Ca(2+) cytosolic concentration, which is suggested to be dependent on the activation of Ca(2+) influx through the plasma membrane. This investigation was carried out with a plasmalemma enriched vesicle fraction, obtained from etiolated maize coleoptiles. The magnitude of Ca(2+) efflux through the membrane vesicles was estimated according to the shift of potential dependent fluorescent dye diS-C₃-(5). The obtained results showed that during coleoptiles ageing (3rd, 4th and 5th days of seedling etiolated growth) the magnitude of Ca(2+) efflux from inside-out vesicles was decreased. Addition of ABP1 led to a recovery of Ca(2+) efflux to the level of the youngest and most sensitive cells. Moreover, the efflux was more sensitive, responding from 10(-8) to 10(-6) M 1-NAA, in vesicles containing ABP1, whereas native vesicles showed the highest efflux at 10(-6) M 1-NAA. We suggest that auxin increases plasma membrane permeability to Ca(2+) and that ABP1 is involved in modulation of this reaction.
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Affiliation(s)
- Anastasia A. Kirpichnikova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, Universitetskaya emb. 7/9, St. Petersburg 199034, Russia; E-Mails: (A.A.K.); (V.V.Y.)
| | - Elena L. Rudashevskaya
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, Universitetskaya emb. 7/9, St. Petersburg 199034, Russia; E-Mails: (A.A.K.); (V.V.Y.)
| | - Vladislav V. Yemelyanov
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, Universitetskaya emb. 7/9, St. Petersburg 199034, Russia; E-Mails: (A.A.K.); (V.V.Y.)
- Department of Genetics and Biotechnology, St. Petersburg State University, Universitetskaya emb. 7/9, St. Petersburg 199034, Russia
| | - Maria F. Shishova
- Department of Plant Physiology and Biochemistry, St. Petersburg State University, Universitetskaya emb. 7/9, St. Petersburg 199034, Russia; E-Mails: (A.A.K.); (V.V.Y.)
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Effendi Y, Jones AM, Scherer GFE. AUXIN-BINDING-PROTEIN1 (ABP1) in phytochrome-B-controlled responses. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:5065-74. [PMID: 24052532 PMCID: PMC3830486 DOI: 10.1093/jxb/ert294] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The auxin receptor ABP1 directly regulates plasma membrane activities including the number of PIN-formed (PIN) proteins and auxin efflux transport. Red light (R) mediated by phytochromes regulates the steady-state level of ABP1 and auxin-inducible growth capacity in etiolated tissues but, until now, there has been no genetic proof that ABP1 and phytochrome regulation of elongation share a common mechanism for organ elongation. In far red (FR)-enriched light, hypocotyl lengths were larger in the abp1-5 and abp1/ABP1 mutants, but not in tir1-1, a null mutant of the TRANSPORT-INHIBITOR-RESPONSE1 auxin receptor. The polar auxin transport inhibitor naphthylphthalamic acid (NPA) decreased elongation in the low R:FR light-enriched white light (WL) condition more strongly than in the high red:FR light-enriched condition WL suggesting that auxin transport is an important condition for FR-induced elongation. The addition of NPA to hypocotyls grown in R- and FR-enriched light inhibited hypocotyl gravitropism to a greater extent in both abp1 mutants and in phyB-9 and phyA-211 than the wild-type hypocotyl, arguing for decreased phytochrome action in conjunction with auxin transport in abp1 mutants. Transcription of FR-enriched light-induced genes, including several genes regulated by auxin and shade, was reduced 3-5-fold in abp1-5 compared with Col and was very low in abp1/ABP1. In the phyB-9 mutant the expression of these reporter genes was 5-15-fold lower than in Col. In tir1-1 and the phyA-211 mutants shade-induced gene expression was greatly attenuated. Thus, ABP1 directly or indirectly participates in auxin and light signalling.
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Affiliation(s)
- Yunus Effendi
- Leibniz Universität Hannover, Institut für Zierpflanzenbau und Gehölzforschung, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany
| | - Alan M. Jones
- Departments of Biology and Pharmacology, University of North Carolina, Chapel Hill, NC 27516, USA
| | - Günther F. E. Scherer
- Leibniz Universität Hannover, Institut für Zierpflanzenbau und Gehölzforschung, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany
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Labusch C, Shishova M, Effendi Y, Li M, Wang X, Scherer GFE. Patterns and timing in expression of early auxin-induced genes imply involvement of phospholipases A (pPLAs) in the regulation of auxin responses. MOLECULAR PLANT 2013; 6:1473-86. [PMID: 23519456 DOI: 10.1093/mp/sst053] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
While it is known that patatin-related phospholipase A (pPLA) activity is rapidly activated within 3 min by auxin, hardly anything is known about how this signal influences downstream responses like transcription of early auxin-induced genes or other physiological responses. We screened mutants with T-DNA insertions in members of the pPLA gene family for molecular and physiological phenotypes related to auxin. Only one in nine Arabidopsis thaliana ppla knockdown mutants displayed an obvious constitutive auxin-related phenotype. Compared to wild-type, ppla-IIIδ mutant seedlings had decreased main root lengths and increased lateral root numbers. We tested auxin-induced gene expression as a molecular readout for primary molecular auxin responses in nine ppla mutants and found delayed up-regulation of auxin-responsive gene expression in all of them. Thirty minutes after auxin treatment, up-regulation of up to 40% of auxin-induced genes was delayed in mutant seedlings. We observed only a few cases with hypersensitive auxin-induced gene expression in ppla mutants. While, in three ppla mutants, which were investigated in detail, rapid up-regulation (as early as 10min after auxin stimulus) of auxin-regulated genes was impaired, late transcriptional responses were wild-type-like. This regulatory or dynamic phenotype was consistently observed in different ppla mutants with delayed up-regulation that frequently affected the same genes. This defect was not affected by pPLA transcript levels which remained constant. This indicates a posttranslational mechanism as a functional link of pPLAs to auxin signaling. The need for a receptor triggering an auxin response without employing transcription regulation is discussed.
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Affiliation(s)
- Corinna Labusch
- Leibniz Universität Hannover, Institut für Zierpflanzenbau und Gehölzwissenschaften, Abt. Molekulare Ertragsphysiologie, Herrenhäuser Str. 2, D-30419 Hannover, Germany
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Grieneisen VA, Marée AFM, Ostergaard L. Juicy stories on female reproductive tissue development: coordinating the hormone flows. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2013; 55:847-63. [PMID: 23869979 DOI: 10.1111/jipb.12092] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Accepted: 07/07/2013] [Indexed: 05/07/2023]
Abstract
In the past 20-30 years, developmental biologists have made tremendous progress in identifying genes required for the specification of individual cell types of an organ and in describing how they interact in genetic networks. In comparison, very little is known about the mechanisms that regulate tissue polarity and overall organ patterning. Gynoecia and fruits from members of the Brassicaceae family of flowering plants provide excellent model systems to study organ patterning and tissue specification because they become partitioned into distinct domains whose formation is determined by polarity establishment both at a cellular and whole tissue level. Interactions among key regulators of Arabidopsis gynoecium and fruit development have revealed a network of upstream transcription factor activities required for such tissue differentiation. Regulation of the plant hormone auxin is emerging as both an immediate downstream output and input of these activities, and here we aim to provide an overview of the current knowledge regarding the link between auxin and female reproductive development in plants. In this review, we will also demonstrate how available data can be exploited in a mathematical modeling approach to reveal and understand the feedback regulatory circuits that underpin the polarity establishment, necessary to guide auxin flows.
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Affiliation(s)
- Verônica A Grieneisen
- Computational and Systems Biology, John Innes Centre, Norwich Research Park, Norwich, NR4 7UH, UK
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Goyal A, Szarzynska B, Fankhauser C. Phototropism: at the crossroads of light-signaling pathways. TRENDS IN PLANT SCIENCE 2013; 18:393-401. [PMID: 23562459 DOI: 10.1016/j.tplants.2013.03.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 02/28/2013] [Accepted: 03/08/2013] [Indexed: 05/11/2023]
Abstract
Phototropism enables plants to orient growth towards the direction of light and thereby maximizes photosynthesis in low-light environments. In angiosperms, blue-light photoreceptors called phototropins are primarily involved in sensing the direction of light. Phytochromes and cryptochromes (sensing red/far-red and blue light, respectively) also modulate asymmetric hypocotyl growth, leading to phototropism. Interactions between different light-signaling pathways regulating phototropism occur in cryptogams and angiosperms. In this review, we focus on the molecular mechanisms underlying the co-action between photosensory systems in the regulation of hypocotyl phototropism in Arabidopsis thaliana. Recent studies have shown that phytochromes and cryptochromes enhance phototropism by controlling the expression of important regulators of phototropin signaling. In addition, phytochromes may also regulate growth towards light via direct interaction with the phototropins.
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Affiliation(s)
- Anupama Goyal
- Centre for Integrative Genomics, University of Lausanne, Genopode Building, CH 1015 Lausanne, Switzerland
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Scherer GFE, Labusch C, Effendi Y. Phospholipases and the Network of Auxin Signal Transduction with ABP1 and TIR1 as Two Receptors: A Comprehensive and Provocative Model. FRONTIERS IN PLANT SCIENCE 2012; 3:56. [PMID: 22629277 PMCID: PMC3355549 DOI: 10.3389/fpls.2012.00056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Accepted: 03/04/2012] [Indexed: 05/08/2023]
Abstract
Three types of phospholipases, phospholipase D, secreted phospholipase A(2), and patatin-related phospholipase A (pPLA) have functions in auxin signal transduction. Potential linkage to auxin receptors ABP1 or TIR1, their rapid activation or post-translational activation mechanisms, and downstream functions regulated by these phospholipases is reviewed and discussed. Only for pPLA all aspects are known at least to some detail. Evidence is gathered that all these signal reactions are located in the cytosol and seem to merge on regulation of PIN-catalyzed auxin efflux transport proteins. As a consequence, auxin concentration in the nucleus is also affected and this regulates the E3 activity of this auxin receptor. We showed that ABP1, PIN2, and pPLA, all outside the nucleus, have an impact on regulation of auxin-induced genes within 30 min. We propose that regulation of PIN protein activities and of auxin efflux transport are the means to coordinate ABP1 and TIR1 activity and that no physical contact between components of the ABP1-triggered cytosolic pathways and TIR1-triggered nuclear pathways of signaling is necessary to perform this.
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Affiliation(s)
- Günther F. E. Scherer
- Laboratory Molekulare Ertragsphysiologie, Institut für Zierpflanzenbau und Gehölzwissenschaften, Leibniz Universität HannoverHannover, Germany
- *Correspondence: Günther F. E. Scherer, Laboratory Molekulare Ertragsphysiologie, Institut für Zierpflanzenbau und Gehölzwissenschaften, Leibniz Universität Hannover, Herrenhäuser Str. 2, D30419 Hannover, Germany. e-mail:
| | - Corinna Labusch
- Laboratory Molekulare Ertragsphysiologie, Institut für Zierpflanzenbau und Gehölzwissenschaften, Leibniz Universität HannoverHannover, Germany
| | - Yunus Effendi
- Laboratory Molekulare Ertragsphysiologie, Institut für Zierpflanzenbau und Gehölzwissenschaften, Leibniz Universität HannoverHannover, Germany
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