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Wang Y, Xiao X, Wang X, Zeng J, Kang H, Fan X, Sha L, Zhang H, Zhou Y. RNA-Seq and iTRAQ Reveal the Dwarfing Mechanism of Dwarf Polish Wheat (Triticum polonicum L.). Int J Biol Sci 2016; 12:653-66. [PMID: 27194943 PMCID: PMC4870709 DOI: 10.7150/ijbs.14577] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 02/15/2016] [Indexed: 11/05/2022] Open
Abstract
The dwarfing mechanism of Rht-dp in dwarf Polish wheat (DPW) is unknown. Each internode of DPW was significantly shorter than it in high Polish wheat (HPW), and the dwarfism was insensitive to photoperiod, abscisic acid (ABA), gibberellin (GA), cytokinin (CK), auxin and brassinolide (BR). To understand the mechanism, three sets of transcripts, DPW, HPW, and a chimeric set (a combination of DPW and HPW), were constructed using RNA sequencing (RNA-Seq). Based on the chimeric transcripts, 2,446 proteins were identified using isobaric tags for relative and absolute quantification (iTRAQ). A total of 108 unigenes and 12 proteins were considered as dwarfism-related differentially expressed genes (DEGs) and differentially expressed proteins (DEPs), respectively. Among of these DEGs and DEPs, 6 DEGs and 6 DEPs were found to be involved in flavonoid and S-adenosyl-methionine (SAM) metabolisms; 5 DEGs and 3 DEPs were involved in cellulose metabolism, cell wall plasticity and cell expansion; 2 DEGs were auxin transporters; 2 DEPs were histones; 1 DEP was a peroxidase. These DEGs and DEPs reduced lignin and cellulose contents, increased flavonoid content, possibly decreased S-adenosyl-methionine (SAM) and polyamine contents and increased S-adenosyl-L-homocysteine hydrolase (SAHH) content in DPW stems, which could limit auxin transport and reduce extensibility of the cell wall, finally limited cell expansion (the cell size of DPW was significantly smaller than HPW cells) and caused dwarfism in DPW.
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Affiliation(s)
- Yi Wang
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Xue Xiao
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Xiaolu Wang
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Jian Zeng
- 2. College of Resources, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Houyang Kang
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Xing Fan
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Lina Sha
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Haiqin Zhang
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
| | - Yonghong Zhou
- 1. Triticeae Research Institute, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China
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102
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Tegg RS, Shabala S, Cuin TA, Wilson CR. Mechanisms of thaxtomin A-induced root toxicity revealed by a thaxtomin A sensitive Arabidopsis mutant (ucu2-2/gi-2). PLANT CELL REPORTS 2016; 35:347-356. [PMID: 26518425 DOI: 10.1007/s00299-015-1888-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 09/21/2015] [Accepted: 10/15/2015] [Indexed: 06/05/2023]
Abstract
The Arabidopsis mutant ( ucu2 - 2/gi - 2 ) is thaxtomin A, isoxaben and NPA-sensitive indicated by root growth and ion flux responses providing new insights into these compounds mode of action and interactions. Thaxtomin A (TA) is a cellulose biosynthetic inhibitor (CBI) that promotes plant cell hypertrophy and cell death. Electrophysiological analysis of steady-state K(+) and Ca(2+) fluxes in Arabidopsis thaliana roots pretreated with TA for 24 h indicated a disturbance in the regulation of ion movement across the plant cell membrane. The observed inability to control solute movement, recorded in rapidly growing meristematic and elongation root zones, may partly explain typical root toxicity responses to TA treatment. Of note, the TA-sensitive mutant (ucu2-2/gi-2) was more susceptible with K(+) and Ca(2+) fluxes altered between 1.3 and eightfold compared to the wild-type control where fluxes altered between 1.2 and threefold. Root growth inhibition assays showed that the ucu2-2/gi-2 mutant had an increased sensitivity to the auxin 2,4-D, but not IAA or NAA; it also had increased sensitivity to the auxin efflux transport inhibitor, 1-naphthylphthalamic acid (NPA), but not 2,3,5- Triiodobenzoic acid (TIBA), when compared to the WT. The NPA sensitivity data were supported by electrophysiological analysis of H(+) fluxes in the mature (but not elongation) root zone. Increased sensitivity to the CBI, isoxaben (IXB), but not dichlobenil was recorded. Increased sensitivity to both TA and IXB corresponded with higher levels of accumulation of these toxins in the root tissue, compared to the WT. Further root growth inhibition assays showed no altered sensitivity of ucu2-2/gi-2 to two other plant pathogen toxins, alternariol and fusaric acid. Identification of a TA-sensitive Arabidopsis mutant provides further insight into how this CBI toxin interacts with plant cells.
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Affiliation(s)
- Robert S Tegg
- Tasmanian Institute of Agriculture, School of Land and Food, University of Tasmania, 13 St. Johns Avenue, New Town, TAS, 7008, Australia.
| | - Sergey Shabala
- Tasmanian Institute of Agriculture, School of Land and Food, University of Tasmania, 13 St. Johns Avenue, New Town, TAS, 7008, Australia
| | - Tracey A Cuin
- Institute for Molecular Plant Physiology and Biophysics, Julius-von-Sachs Platz 2, 97082, Würzburg, Germany
| | - Calum R Wilson
- Tasmanian Institute of Agriculture, School of Land and Food, University of Tasmania, 13 St. Johns Avenue, New Town, TAS, 7008, Australia
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103
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Kuhn BM, Errafi S, Bucher R, Dobrev P, Geisler M, Bigler L, Zažímalová E, Ringli C. 7-Rhamnosylated Flavonols Modulate Homeostasis of the Plant Hormone Auxin and Affect Plant Development. J Biol Chem 2016; 291:5385-95. [PMID: 26742840 DOI: 10.1074/jbc.m115.701565] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Indexed: 11/06/2022] Open
Abstract
Flavonols are a group of secondary metabolites that affect diverse cellular processes. They are considered putative negative regulators of the transport of the phytohormone auxin, by which they influence auxin distribution and concomitantly take part in the control of plant organ development. Flavonols are accumulating in a large number of glycosidic forms. Whether these have distinct functions and diverse cellular targets is not well understood. The rol1-2 mutant of Arabidopsis thaliana is characterized by a modified flavonol glycosylation profile that is inducing changes in auxin transport and growth defects in shoot tissues. To determine whether specific flavonol glycosides are responsible for these phenotypes, a suppressor screen was performed on the rol1-2 mutant, resulting in the identification of an allelic series of UGT89C1, a gene encoding a flavonol 7-O-rhamnosyltransferase. A detailed analysis revealed that interfering with flavonol rhamnosylation increases the concentration of auxin precursors and auxin metabolites, whereas auxin transport is not affected. This finding provides an additional level of complexity to the possible ways by which flavonols influence auxin distribution and suggests that flavonol glycosides play an important role in regulating plant development.
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Affiliation(s)
- Benjamin M Kuhn
- From the Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland
| | - Sanae Errafi
- From the Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland
| | - Rahel Bucher
- the Department of Chemistry, University of Zurich, 8057 Zurich, Switzerland
| | - Petre Dobrev
- the Institute of Experimental Botany, Academy of Sciences of the Czech Republic, 165 02 Prague 6, Czech Republic, and
| | - Markus Geisler
- the Department of Biology, University of Fribourg, 1700 Fribourg, Switzerland
| | - Laurent Bigler
- the Department of Chemistry, University of Zurich, 8057 Zurich, Switzerland
| | - Eva Zažímalová
- the Institute of Experimental Botany, Academy of Sciences of the Czech Republic, 165 02 Prague 6, Czech Republic, and
| | - Christoph Ringli
- From the Department of Plant and Microbial Biology, University of Zurich, 8008 Zurich, Switzerland,
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104
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Carland F, Defries A, Cutler S, Nelson T. Novel Vein Patterns in Arabidopsis Induced by Small Molecules. PLANT PHYSIOLOGY 2016; 170:338-53. [PMID: 26574596 PMCID: PMC4704596 DOI: 10.1104/pp.15.01540] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 11/03/2015] [Indexed: 05/03/2023]
Abstract
The critical role of veins in transporting water, nutrients, and signals suggests that some key regulators of vein formation may be genetically redundant and, thus, undetectable by forward genetic screens. To identify such regulators, we screened more than 5000 structurally diverse small molecules for compounds that alter Arabidopsis (Arabidopsis thaliana) leaf vein patterns. Many compound-induced phenotypes were observed, including vein networks with an open reticulum; decreased or increased vein number and thickness; and misaligned, misshapen, or nonpolar vascular cells. Further characterization of several individual active compounds suggests that their targets include hormone cross talk, hormone-dependent transcription, and PIN-FORMED trafficking.
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Affiliation(s)
- Francine Carland
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520 (F.C., T.N.);Bloomfield Industries, Inc., Staten Island, New York 10314 (A.D.); andDepartment of Botany and Plant Sciences, University of California, Riverside, Riverside, California 92507 (S.C.)
| | - Andrew Defries
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520 (F.C., T.N.);Bloomfield Industries, Inc., Staten Island, New York 10314 (A.D.); andDepartment of Botany and Plant Sciences, University of California, Riverside, Riverside, California 92507 (S.C.)
| | - Sean Cutler
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520 (F.C., T.N.);Bloomfield Industries, Inc., Staten Island, New York 10314 (A.D.); andDepartment of Botany and Plant Sciences, University of California, Riverside, Riverside, California 92507 (S.C.)
| | - Timothy Nelson
- Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520 (F.C., T.N.);Bloomfield Industries, Inc., Staten Island, New York 10314 (A.D.); andDepartment of Botany and Plant Sciences, University of California, Riverside, Riverside, California 92507 (S.C.)
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105
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Pan X, Chen J, Yang Z. Auxin regulation of cell polarity in plants. CURRENT OPINION IN PLANT BIOLOGY 2015; 28:144-53. [PMID: 26599954 PMCID: PMC7513928 DOI: 10.1016/j.pbi.2015.10.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Revised: 10/16/2015] [Accepted: 10/19/2015] [Indexed: 05/04/2023]
Abstract
Auxin is well known to control pattern formation and directional growth at the organ/tissue levels via the nuclear TIR1/AFB receptor-mediated transcriptional responses. Recent studies have expanded the arena of auxin actions as a trigger or key regulator of cell polarization and morphogenesis. These actions require non-transcriptional responses such as changes in the cytoskeleton and vesicular trafficking, which are commonly regulated by ROP/Rac GTPase-dependent pathways. These findings beg for the question about the nature of auxin receptors that regulate these responses and renew the interest in ABP1 as a cell surface auxin receptor, including the work showing auxin-binding protein 1 (ABP1) interacts with the extracellular domain of the transmembrane kinase (TMK) receptor-like kinases in an auxin-dependent manner, as well as the debate on this auxin binding protein discovered about 40 years ago. This review highlights recent work on the non-transcriptional auxin signaling mechanisms underscoring cell polarity and shape formation in plants.
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Affiliation(s)
- Xue Pan
- Haixia Institute of Science and Technology, Horticultural Plant Biology and Metabolomics Center, Fujian Agriculture and Forestry University, Fuzhou 350002, China; Center for Plant Cell Biology, Institute of Integrated Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, CA, USA
| | - Jisheng Chen
- Haixia Institute of Science and Technology, Horticultural Plant Biology and Metabolomics Center, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
| | - Zhenbiao Yang
- Center for Plant Cell Biology, Institute of Integrated Genome Biology, Department of Botany and Plant Sciences, University of California, Riverside, CA, USA.
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106
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Pan L, Zeng W, Niu L, Lu Z, Liu H, Cui G, Zhu Y, Chu J, Li W, Fang W, Cai Z, Li G, Wang Z. PpYUC11, a strong candidate gene for the stony hard phenotype in peach (Prunus persica L. Batsch), participates in IAA biosynthesis during fruit ripening. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:7031-44. [PMID: 26307136 PMCID: PMC4765781 DOI: 10.1093/jxb/erv400] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
High concentrations of indole-3-acetic acid (IAA) are required for climacteric ethylene biosynthesis to cause fruit softening in melting flesh peaches at the late ripening stage. By contrast, the fruits of stony hard peach cultivars do not soften and produce little ethylene due to the low IAA concentrations. To investigate the regulation of IAA accumulation during peach ripening [the transition from stage S3 to stage S4 III (climacteric)], a digital gene expression (DGE) analysis was performed. The expression patterns of auxin-homeostasis-related genes were compared in fruits of the melting flesh peach 'Goldhoney 3' and the stony hard flesh peach 'Yumyeong' during the ripening stage. It is revealed here that a YUCCA flavin mono-oxygenase gene (PpYUC11, ppa008176m), a key gene in auxin biosynthesis, displayed an identical differential expression profile to the profiles of IAA accumulation and PpACS1 transcription: the mRNA transcripts increased at the late ripening stage in melting flesh peaches but were below the limit of detection in mature fruits of stony hard peaches. In addition, the strong association between intron TC microsatellite genotypes of PpYUC11 and the flesh texture (normal or stony hard) is described in 43 peach varieties, indicating that this locus may be responsible for the stony hard phenotype in peach. These findings support the hypothesis that PpYUC11 may play an essential role in auxin biosynthesis during peach fruit ripening and is a candidate gene for the control of the stony hard phenotype in peach.
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Affiliation(s)
- Lei Pan
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China
| | - Wenfang Zeng
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Liang Niu
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Zhenhua Lu
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Hui Liu
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Guochao Cui
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Yunqin Zhu
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Jinfang Chu
- National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Weiping Li
- National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
| | - Weichao Fang
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Zuguo Cai
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
| | - Guohuai Li
- Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China
| | - Zhiqiang Wang
- Key Laboratory of Fruit Breeding Technology, Ministry of Agriculture, Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou 450009, China
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107
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Mitogen Activated Protein Kinase (MPK) Interacts With Auxin Influx Carrier (OsAux/LAX1) Involved in Auxin Signaling in Plant. Biol Proced Online 2015; 17:13. [PMID: 26526688 PMCID: PMC4628314 DOI: 10.1186/s12575-015-0025-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 10/21/2015] [Indexed: 11/19/2022] Open
Abstract
Background Mitogen activated protein kinases (MPKs) are serine/threonine protein kinases that contain characteristic T-x-Y motif in the activation loop region. MPKs are important signaling molecules involved in diverse signaling cascades that regulate plant growth, development and stress responses by conducting phosphorylation events in their target proteins. MPKs phosphorylate their target proteins at either S-P/T-P (Serine/Proline/Threonine) amino acid. To understand, if MPKs are involved in the auxin signaling cascade, we identified probable target proteins of MPKs involved in auxin signaling or transport processes. Results A genome-wide search of the rice genome database led us to identification of the OsAux/LAX1 gene as a potential downstream target protein of MPKs. In-silico analysis predicted that MPKs interact with OsAux/LAX1 proteins which were validated by a yeast two-hybrid assay that showed OsMPK3, OsMPK4 and OsMPK6 are physically interact with OsAux/LAX1 protein. Conclusion The yeast two-hybrid interaction showed that MPKs are directly involved in auxin signaling events in plants. This is the first study to report direct involvement of MPKs in the auxin signaling pathway.
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108
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Ng JLP, Perrine-Walker F, Wasson AP, Mathesius U. The Control of Auxin Transport in Parasitic and Symbiotic Root-Microbe Interactions. PLANTS (BASEL, SWITZERLAND) 2015; 4:606-43. [PMID: 27135343 PMCID: PMC4844411 DOI: 10.3390/plants4030606] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Revised: 08/12/2015] [Accepted: 08/18/2015] [Indexed: 01/13/2023]
Abstract
Most field-grown plants are surrounded by microbes, especially from the soil. Some of these, including bacteria, fungi and nematodes, specifically manipulate the growth and development of their plant hosts, primarily for the formation of structures housing the microbes in roots. These developmental processes require the correct localization of the phytohormone auxin, which is involved in the control of cell division, cell enlargement, organ development and defense, and is thus a likely target for microbes that infect and invade plants. Some microbes have the ability to directly synthesize auxin. Others produce specific signals that indirectly alter the accumulation of auxin in the plant by altering auxin transport. This review highlights root-microbe interactions in which auxin transport is known to be targeted by symbionts and parasites to manipulate the development of their host root system. We include case studies for parasitic root-nematode interactions, mycorrhizal symbioses as well as nitrogen fixing symbioses in actinorhizal and legume hosts. The mechanisms to achieve auxin transport control that have been studied in model organisms include the induction of plant flavonoids that indirectly alter auxin transport and the direct targeting of auxin transporters by nematode effectors. In most cases, detailed mechanisms of auxin transport control remain unknown.
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Affiliation(s)
- Jason Liang Pin Ng
- Division of Plant Science, Research School of Biology, Australian National University, Linnaeus Way, Building 134, Canberra ACT 2601, Australia.
| | | | | | - Ulrike Mathesius
- Division of Plant Science, Research School of Biology, Australian National University, Linnaeus Way, Building 134, Canberra ACT 2601, Australia.
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109
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Ng JLP, Hassan S, Truong TT, Hocart CH, Laffont C, Frugier F, Mathesius U. Flavonoids and Auxin Transport Inhibitors Rescue Symbiotic Nodulation in the Medicago truncatula Cytokinin Perception Mutant cre1. THE PLANT CELL 2015; 27:2210-26. [PMID: 26253705 PMCID: PMC4568502 DOI: 10.1105/tpc.15.00231] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 06/18/2015] [Accepted: 07/08/2015] [Indexed: 05/18/2023]
Abstract
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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Affiliation(s)
- Jason Liang Pin Ng
- Division of Plant Science, Research School of Biology, Australian National University, Canberra ACT 2601, Australia
| | - Samira Hassan
- Division of Plant Science, Research School of Biology, Australian National University, Canberra ACT 2601, Australia
| | - Thy T Truong
- Mass Spectrometry Facility, Research School of Biology, Australian National University, Canberra ACT 2601, Australia
| | - Charles H Hocart
- Mass Spectrometry Facility, Research School of Biology, Australian National University, Canberra ACT 2601, Australia
| | - Carole Laffont
- Institute of Plant Sciences-Paris Saclay University (IPS2), UMR 9213/UMR 1403, CNRS/INRA/Université Paris-Sud/Université Paris-Diderot/Université d'Evry, 91405 Orsay, France
| | - Florian Frugier
- Institute of Plant Sciences-Paris Saclay University (IPS2), UMR 9213/UMR 1403, CNRS/INRA/Université Paris-Sud/Université Paris-Diderot/Université d'Evry, 91405 Orsay, France
| | - Ulrike Mathesius
- Division of Plant Science, Research School of Biology, Australian National University, Canberra ACT 2601, Australia
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110
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Mohanta TK, Mohanta N, Bae H. Identification and Expression Analysis of PIN-Like (PILS) Gene Family of Rice Treated with Auxin and Cytokinin. Genes (Basel) 2015; 6:622-40. [PMID: 26193322 PMCID: PMC4584321 DOI: 10.3390/genes6030622] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 07/10/2015] [Accepted: 07/10/2015] [Indexed: 11/16/2022] Open
Abstract
The phytohormone auxin is one of the most important signaling molecules that undergo accumulation or depletion in a temporal or spatial manner due to wide arrays of changes in developmental or stress programs. Proper distribution, maintenance and homeostasis of auxin molecules across the plant systems are one of the most important phenomena required for proper growth and development of plant. The distribution and homeostasis of auxin is maintained by auxin transport systems across the plant. The auxin transportation is carried out by auxin transporter family proteins, popularly known as auxin efflux carriers (PINs). In this study, a sub-family of auxin efflux carrier (OsPILS) genes was identified from Oryza sativa and relative expression profile was studied by treating them with auxin and cytokinin. Oryza sativa encodes seven putative sub-cellularly localized transmembrane OsPILS genes distributed in five chromosomes. Differential expression of OsPILS genes was found to be modulated by auxin and cytokinin treatment. In auxin treated plants, all OsPILS genes were up-regulated in leaves and down regulated in roots during the third week time period of developmental stages. In the cytokinin treated plants, the maximum of OsPILS genes were up-regulated during the third week time period in root and leaf tissue. Regulation of gene expression of OsPILS genes by auxin and cytokinin during the third week time period revealed its important role in plant growth and development.
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Affiliation(s)
- Tapan Kumar Mohanta
- Department Biotechnology, Biotechnology Building, Techno Park, Yeungnam University, Daehak Gyeongsan 712749, Korea.
| | - Nibedita Mohanta
- Department of Biotechnology, North Orissa University, Takatpur, Baripada, Mayurbhanj, Orissa 757003, India.
| | - Hanhong Bae
- Department Biotechnology, Biotechnology Building, Techno Park, Yeungnam University, Daehak Gyeongsan 712749, Korea.
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Abstract
Understanding how seed size is regulated in angiosperms is a key goal for plant science as seed size is an important component of overall seed yield. Angiosperm seeds comprise three clearly defined components, i.e. the embryo, endosperm and seed coat, with each having a distinct genetic composition which exerts different influences on seed development. Complex cross-talk and integration of signals from these different regions of the seed together determine its final size. The present review considers some of the major regulators of seed size, with a particular emphasis on the role of the seed coat in modulating endosperm proliferation and cellularization. The innermost layer of the seed coat, the endothelium, synthesizes flavonoids which are held to provide a defensive function against microbes, act as feeding deterrents, provide UV protection and to have a role in seed dormancy. A growing body of data suggests that flavonoids may also play a fundamental role in regulating communication between the seed coat and the endosperm. In the present review, we discuss how this may be achieved in the light of the fact that several flavonoids are known to be potent auxin transport regulators.
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112
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Robson TM, Klem K, Urban O, Jansen MAK. Re-interpreting plant morphological responses to UV-B radiation. PLANT, CELL & ENVIRONMENT 2015; 38:856-66. [PMID: 24890713 DOI: 10.1111/pce.12374] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 05/08/2014] [Accepted: 05/11/2014] [Indexed: 05/02/2023]
Abstract
There is a need to reappraise the effects of UV-B radiation on plant morphology in light of improved mechanistic understanding of UV-B effects, particularly elucidation of the UV RESISTANCE LOCUS 8 (UVR8) photoreceptor. We review responses at cell and organismal levels, and explore their underlying regulatory mechanisms, function in UV protection and consequences for plant fitness. UV-induced morphological changes include thicker leaves, shorter petioles, shorter stems, increased axillary branching and altered root:shoot ratios. At the cellular level, UV-B morphogenesis comprises changes in cell division, elongation and/or differentiation. However, notwithstanding substantial new knowledge of molecular, cellular and organismal UV-B responses, there remains a clear gap in our understanding of the interactions between these organizational levels, and how they control plant architecture. Furthermore, despite a broad consensus that UV-B induces relatively compact architecture, we note substantial diversity in reported phenotypes. This may relate to UV-induced morphological changes being underpinned by different mechanisms at high and low UV-B doses. It remains unproven whether UV-induced morphological changes have a protective function involving shading and decreased leaf penetration of UV-B, counterbalancing trade-offs such as decreased photosynthetic light capture and plant-competitive abilities. Future research will need to disentangle seemingly contradictory interactions occurring at the threshold UV dose where regulation and stress-induced morphogenesis overlap.
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Affiliation(s)
- T Matthew Robson
- Department of Biosciences, University of Helsinki, Helsinki, 00014, Finland
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Ahrazem O, Rubio-Moraga A, Trapero-Mozos A, Climent MFL, Gómez-Cadenas A, Gómez-Gómez L. Ectopic expression of a stress-inducible glycosyltransferase from saffron enhances salt and oxidative stress tolerance in Arabidopsis while alters anchor root formation. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 234:60-73. [PMID: 25804810 DOI: 10.1016/j.plantsci.2015.02.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2014] [Revised: 02/09/2015] [Accepted: 02/11/2015] [Indexed: 05/03/2023]
Abstract
Glycosyltransferases play diverse roles in cellular metabolism by modifying the activities of regulatory metabolites. Three stress-regulated UDP-glucosyltransferase-encoding genes have been isolated from the stigmas of saffron, UGT85U1, UGT85U2 and UGT85V1, which belong to the UGT85 family that includes members associated with stress responses and cell cycle regulation. Arabidopsis constitutively expressing UGT85U1 exhibited and increased anchor root development. No differences were observed in the timing of root emergence, in leaf, stem and flower morphology or flowering time. However, salt and oxidative stress tolerance was enhanced in these plants. Levels of glycosylated compounds were measured in these plants and showed changes in the composition of several indole-derivatives. Moreover, auxin levels in the roots were higher compared to wild type. The expression of several key genes related to root development and auxin homeostasis, including CDKB2.1, CDKB2.2, PIN2, 3 and 4; TIR1, SHR, and CYCD6, were differentially regulated with an increase of expression level of SHR, CYCD6, CDKB2.1 and PIN2. The obtained results showed that UGT85U1 takes part in root growth regulation via auxin signal alteration and the modified expression of cell cycle-related genes, resulting in significantly improved survival during oxidative and salt stress treatments.
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Affiliation(s)
- Oussama Ahrazem
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain; Fundación Parque Científico y Tecnológico de Albacete, Spain
| | - Angela Rubio-Moraga
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | - Almudena Trapero-Mozos
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain
| | | | - Aurelio Gómez-Cadenas
- Universitat Jaume I, Department of Agricultural and Environmental Sciences, 12071 Castelló de la Plana, Spain
| | - Lourdes Gómez-Gómez
- Instituto Botánico, Departamento de Ciencia y Tecnología Agroforestal y Genética, Facultad de Farmacia, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
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114
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Chen L, Liu Y, Liu H, Kang L, Geng J, Gai Y, Ding Y, Sun H, Li Y. Identification and expression analysis of MATE genes involved in flavonoid transport in blueberry plants. PLoS One 2015; 10:e0118578. [PMID: 25781331 PMCID: PMC4363705 DOI: 10.1371/journal.pone.0118578] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Accepted: 01/21/2015] [Indexed: 01/17/2023] Open
Abstract
Multidrug and toxic compound extrusion (MATE) proteins are the most recently identified family of multidrug transporters. In plants, this family is remarkably large compared to the human and bacteria counterpart, highlighting the importance of MATE proteins in this kingdom. Here 33 Unigenes annotated as MATE transporters were found in the blueberry fruit transcriptome, of which eight full-length cDNA sequences were identified and cloned. These proteins are composed of 477-517 residues, with molecular masses ~54 kDa, and theoretical isoelectric points from 5.35 to 8.41. Bioinformatics analysis predicted 10-12 putative transmembrane segments for VcMATEs, and localization to the plasma membrane without an N-terminal signal peptide. All blueberry MATE proteins shared 32.1-84.4% identity, among which VcMATE2, VcMATE3, VcMATE5, VcMATE7, VcMATE8, and VcMATE9 were more similar to the MATE-type flavonoid transporters. Phylogenetic analysis showed VcMATE2, VcMATE3, VcMATE5, VcMATE7, VcMATE8 and VcMATE9 clustered with MATE-type flavonoid transporters, indicating that they might be involved in flavonoid transport. VcMATE1 and VcMATE4 may be involved in the transport of secondary metabolites, the detoxification of xenobiotics, or the export of toxic cations. Real-time quantitative PCR demonstrated that the expression profile of the eight VcMATE genes varied spatially and temporally. Analysis of expression and anthocyanin accumulation indicated that there were some correlation between the expression profile and the accumulation of anthocyanins. These results showed VcMATEs might be involved in diverse physiological functions, and anthocyanins across the membranes might be mutually maintained by MATE-type flavonoid transporters and other mechanisms. This study will enrich the MATE-based transport mechanisms of secondary metabolite, and provide a new biotechonology strategy to develop better nutritional blueberry cultivars.
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Affiliation(s)
- Li Chen
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Yushan Liu
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Hongdi Liu
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Limin Kang
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Jinman Geng
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Yuzhuo Gai
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Yunlong Ding
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
| | - Haiyue Sun
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
- * E-mail: (HS); (YL)
| | - Yadong Li
- College of Horticulture, Jilin Agricultural University, Changchun, Jilin, China
- * E-mail: (HS); (YL)
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115
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Schluttenhofer C, Yuan L. Regulation of specialized metabolism by WRKY transcription factors. PLANT PHYSIOLOGY 2015; 167:295-306. [PMID: 25501946 PMCID: PMC4326757 DOI: 10.1104/pp.114.251769] [Citation(s) in RCA: 165] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Accepted: 12/08/2014] [Indexed: 05/19/2023]
Abstract
WRKY transcription factors (TFs) are well known for regulating plant abiotic and biotic stress tolerance. However, much less is known about how WRKY TFs affect plant-specialized metabolism. Analysis of WRKY TFs regulating the production of specialized metabolites emphasizes the values of the family outside of traditionally accepted roles in stress tolerance. WRKYs with conserved roles across plant species seem to be essential in regulating specialized metabolism. Overall, the WRKY family plays an essential role in regulating the biosynthesis of important pharmaceutical, aromatherapy, biofuel, and industrial components, warranting considerable attention in the forthcoming years.
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Affiliation(s)
- Craig Schluttenhofer
- Department of Plant and Soil Sciences and Kentucky Tobacco Research and Development Center, University of Kentucky, Lexington, Kentucky 40546
| | - Ling Yuan
- Department of Plant and Soil Sciences and Kentucky Tobacco Research and Development Center, University of Kentucky, Lexington, Kentucky 40546
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116
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Maag D, Erb M, Köllner TG, Gershenzon J. Defensive weapons and defense signals in plants: Some metabolites serve both roles. Bioessays 2014; 37:167-74. [DOI: 10.1002/bies.201400124] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Daniel Maag
- Laboratory of Fundamental and Applied Research in Chemical Ecology; University of Neuchâtel; Neuchâtel Switzerland
- Laboratory of Phytochemistry and Bioactive Natural Products; University of Geneva; Geneva Switzerland
| | - Matthias Erb
- Institute of Plant Sciences; University of Bern; Bern Switzerland
| | - Tobias G. Köllner
- Department of Biochemistry; Max Planck Institute for Chemical Ecology; Jena Germany
| | - Jonathan Gershenzon
- Department of Biochemistry; Max Planck Institute for Chemical Ecology; Jena Germany
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117
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Yan Z, Guo H, Yang J, Liu Q, Jin H, Xu R, Cui H, Qin B. Phytotoxic flavonoids from roots of Stellera chamaejasme L. (Thymelaeaceae). PHYTOCHEMISTRY 2014; 106:61-68. [PMID: 25096753 DOI: 10.1016/j.phytochem.2014.07.013] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2012] [Revised: 02/14/2014] [Accepted: 07/08/2014] [Indexed: 06/03/2023]
Abstract
Allelopathy, the negative effect on plants of chemicals released to the surroundings by a neighboring plant, is an important factor which contributes to the spread of some weeds in plant communities. In this field, Stellera chamaejasme L. (Thymelaeaceae) is one of the most toxic and ecologically-threatening weeds in some of the grasslands of north and west China. Bioassay-guided fractionation of root extracts of this plant led to the isolation of eight flavonoids 1-8, whose structures were elucidated by spectroscopic analysis. All compounds obtained, except 7-methoxylneochaejasmin A (4) and (+)-epiafzelechin (5), showed strong phytotoxic activity against Arabidopsis thaliana seedlings. Seedling growth was reduced by neochamaejasmin B (1), mesoneochamaejasmin A (2), chamaejasmenin C (3), genkwanol A (6), daphnodorin B (7) and dihydrodaphnodorin B (8) with IC50 values of 6.9, 12.1, 43.2, 74.8, 7.1 and 27.3μg/mL, respectively, and all of these compounds disrupted root development. Endogenous auxin levels at the root tips of the A. thaliana DR5::GUS transgenic line were largely reduced by compounds 1, 2 and 6-8, and were increased by compound 4. Moreover, the inhibition rate of A. thaliana auxin transport mutants pin2 and aux1-7 by compounds 1-8 were all lower than the wild type (Col-0). The influence of these compounds on endogenous auxin distribution is thus proposed as a critical factor for the phytotoxic effect. Compounds 1, 2, 4 and 8 were found in soils associated with S. chamaejasme, and these flavonoids also showed phytotoxicity to Clinelymus nutans L., an associated weed of S. chamaejasme. These results indicated that some phytotoxic compounds from roots of S. chamaejasme may be involved in the potential allelopathic behavior of this widespread weed.
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Affiliation(s)
- Zhiqiang Yan
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Hongru Guo
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Jiayue Yang
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Quan Liu
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Hui Jin
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Rui Xu
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Haiyan Cui
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
| | - Bo Qin
- Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China; State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, PR China.
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118
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Maloney GS, DiNapoli KT, Muday GK. The anthocyanin reduced tomato mutant demonstrates the role of flavonols in tomato lateral root and root hair development. PLANT PHYSIOLOGY 2014; 166:614-31. [PMID: 25006027 PMCID: PMC4213093 DOI: 10.1104/pp.114.240507] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Accepted: 07/03/2014] [Indexed: 05/20/2023]
Abstract
This study utilized tomato (Solanum lycopersicum) mutants with altered flavonoid biosynthesis to understand the impact of these metabolites on root development. The mutant anthocyanin reduced (are) has a mutation in the gene encoding FLAVONOID 3-HYDROXYLASE (F3H), the first step in flavonol synthesis, and accumulates higher concentrations of the F3H substrate, naringenin, and lower levels of the downstream products kaempferol, quercetin, myricetin, and anthocyanins, than the wild type. Complementation of are with the p35S:F3H transgene reduced naringenin and increased flavonols to wild-type levels. The initiation of lateral roots is reduced in are, and p35S:F3H complementation restores wild-type root formation. The flavonoid mutant anthocyanin without has a defect in the gene encoding DIHYDROFLAVONOL REDUCTASE, resulting in elevated flavonols and the absence of anthocyanins and displays increased lateral root formation. These results are consistent with a positive role of flavonols in lateral root formation. The are mutant has increased indole-3-acetic acid transport and greater sensitivity to the inhibitory effect of the auxin transport inhibitor naphthylphthalamic acid on lateral root formation. Expression of the auxin-induced reporter (DR5-β-glucuronidase) is reduced in initiating lateral roots and increased in primary root tips of are. Levels of reactive oxygen species are elevated in are root epidermal tissues and root hairs, and are forms more root hairs, consistent with a role of flavonols as antioxidants that modulate root hair formation. Together, these experiments identify positive roles of flavonols in the formation of lateral roots and negative roles in the formation of root hairs through the modulation of auxin transport and reactive oxygen species, respectively.
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Affiliation(s)
- Gregory S Maloney
- Department of Biology and Center for Molecular Communication and Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Kathleen T DiNapoli
- Department of Biology and Center for Molecular Communication and Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
| | - Gloria K Muday
- Department of Biology and Center for Molecular Communication and Signaling, Wake Forest University, Winston-Salem, North Carolina 27109
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119
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Bourion V, Martin C, de Larambergue H, Jacquin F, Aubert G, Martin-Magniette ML, Balzergue S, Lescure G, Citerne S, Lepetit M, Munier-Jolain N, Salon C, Duc G. Unexpectedly low nitrogen acquisition and absence of root architecture adaptation to nitrate supply in a Medicago truncatula highly branched root mutant. JOURNAL OF EXPERIMENTAL BOTANY 2014; 65:2365-80. [PMID: 24706718 PMCID: PMC4036509 DOI: 10.1093/jxb/eru124] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
To complement N2 fixation through symbiosis, legumes can efficiently acquire soil mineral N through adapted root architecture. However, root architecture adaptation to mineral N availability has been little studied in legumes. Therefore, this study investigated the effect of nitrate availability on root architecture in Medicago truncatula and assessed the N-uptake potential of a new highly branched root mutant, TR185. The effects of varying nitrate supply on both root architecture and N uptake were characterized in the mutant and in the wild type. Surprisingly, the root architecture of the mutant was not modified by variation in nitrate supply. Moreover, despite its highly branched root architecture, TR185 had a permanently N-starved phenotype. A transcriptome analysis was performed to identify genes differentially expressed between the two genotypes. This analysis revealed differential responses related to the nitrate acquisition pathway and confirmed that N starvation occurred in TR185. Changes in amino acid content and expression of genes involved in the phenylpropanoid pathway were associated with differences in root architecture between the mutant and the wild type.
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Affiliation(s)
| | - Chantal Martin
- INRA, UMR1347 Agroécologie, BP 86510, F-21065 Dijon, France
| | | | | | | | - Marie-Laure Martin-Magniette
- INRA, UMR518 MIA, F-75231 Paris, France AgroParisTech, UMR MIA, F-75231 Paris, France INRA, UMR1165 URGV, F-91057 Evry, France UEVE, UMR URGV, F-91057 Evry, France CNRS, ERL8196 UMR URGV, F-91057 Evry, France
| | - Sandrine Balzergue
- INRA, UMR1165 URGV, F-91057 Evry, France UEVE, UMR URGV, F-91057 Evry, France CNRS, ERL8196 UMR URGV, F-91057 Evry, France
| | - Geoffroy Lescure
- Institut Jean-Pierre Bourgin, UMR1318 INRA/AgroParisTech, F-78026 Versailles, France
| | - Sylvie Citerne
- Institut Jean-Pierre Bourgin, UMR1318 INRA/AgroParisTech, F-78026 Versailles, France
| | - Marc Lepetit
- USC1342 INRA, UMR113 IRD-CIRAD-SupAgro-UM2, Symbioses Tropicales et Méditerranéennes, Campus de Baillarguet, TA A-82/J, F-34398 Montpellier Cedex 5, France
| | | | | | - Gérard Duc
- INRA, UMR1347 Agroécologie, BP 86510, F-21065 Dijon, France
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120
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Peer WA, Jenness MK, Murphy AS. Measure for measure: determining, inferring and guessing auxin gradients at the root tip. PHYSIOLOGIA PLANTARUM 2014; 151:97-111. [PMID: 24617531 DOI: 10.1111/ppl.12182] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2013] [Revised: 03/05/2014] [Accepted: 03/07/2014] [Indexed: 05/03/2023]
Abstract
The plant hormone auxin is transported from sites of synthesis to sites of action. Auxin responses are mediated by fast (non-transcriptional) and slow (transcriptional; ubiquitinylation) responses, which affect physiological changes at cellular and organismal scales. As such, auxin transport vectors regulate programmed and plastic growth responses to optimize growth and development. Here we address some common problems in extrapolating 'universal' understanding of auxin transport streams from analyses of loss-of-function mutants and auxin transport inhibitors. We also discuss the analytical methods and tools used to directly quantify, measure and infer auxin gradients within the plant [DR5:GUS/GFP (beta-glucuronidase/green fluorescent protein), DII-VENUS; surface electrodes, direct quantification]. We discuss the assumptions and limitations of each of these analyses, present comparative summaries of auxin transport methods and assay conditions (diffusion, non-specific transport and relevant assay conditions), and consider what is actually being transported and measured [labeled-indole-3-acetic acid (IAA), IAA metabolites].
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Affiliation(s)
- Wendy Ann Peer
- Department of Environmental Science and Technology, University of Maryland, College Park, MD, 20742, USA; Department of Plant Science and Landscape Architecture, University of Maryland, College Park, MD, 20742, USA
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121
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Band LR, Wells DM, Fozard JA, Ghetiu T, French AP, Pound MP, Wilson MH, Yu L, Li W, Hijazi HI, Oh J, Pearce SP, Perez-Amador MA, Yun J, Kramer E, Alonso JM, Godin C, Vernoux T, Hodgman TC, Pridmore TP, Swarup R, King JR, Bennett MJ. Systems analysis of auxin transport in the Arabidopsis root apex. THE PLANT CELL 2014; 26:862-75. [PMID: 24632533 PMCID: PMC4001398 DOI: 10.1105/tpc.113.119495] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 01/06/2014] [Accepted: 02/14/2014] [Indexed: 05/17/2023]
Abstract
Auxin is a key regulator of plant growth and development. Within the root tip, auxin distribution plays a crucial role specifying developmental zones and coordinating tropic responses. Determining how the organ-scale auxin pattern is regulated at the cellular scale is essential to understanding how these processes are controlled. In this study, we developed an auxin transport model based on actual root cell geometries and carrier subcellular localizations. We tested model predictions using the DII-VENUS auxin sensor in conjunction with state-of-the-art segmentation tools. Our study revealed that auxin efflux carriers alone cannot create the pattern of auxin distribution at the root tip and that AUX1/LAX influx carriers are also required. We observed that AUX1 in lateral root cap (LRC) and elongating epidermal cells greatly enhance auxin's shootward flux, with this flux being predominantly through the LRC, entering the epidermal cells only as they enter the elongation zone. We conclude that the nonpolar AUX1/LAX influx carriers control which tissues have high auxin levels, whereas the polar PIN carriers control the direction of auxin transport within these tissues.
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Affiliation(s)
- Leah R. Band
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Darren M. Wells
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - John A. Fozard
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Teodor Ghetiu
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Andrew P. French
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Michael P. Pound
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Michael H. Wilson
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Lei Yu
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Wenda Li
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Hussein I. Hijazi
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Jaesung Oh
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Simon P. Pearce
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Miguel A. Perez-Amador
- Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia–Consejo Superior de Investigaciones Científicas, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Jeonga Yun
- Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695
| | - Eric Kramer
- Physics Department, Bard College at Simon’s Rock, Great Barrington, Massachusetts 01230
| | - Jose M. Alonso
- Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695
| | - Christophe Godin
- Virtual Plants Project Team, Unité Mixte de Recherche, Amélioration Génétique des Plantes Méditerranéennes et Tropicales, Institut National de Recherche en Informatique et en Automatique/Centre de Coopération Internationale en Recherche Agronomique pour le Développement, 34095 Montpellier, France
| | - Teva Vernoux
- Laboratoire de Reproduction et Developpement des Plantes, CNRS, INRA, Ecole Normale Supérieure Lyon, Université Claude Bernard Lyon 1, Université de Lyon, 69364 Lyon, France
| | - T. Charlie Hodgman
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Tony P. Pridmore
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Ranjan Swarup
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - John R. King
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
| | - Malcolm J. Bennett
- Centre for Plant Integrative Biology, University of Nottingham, Nottingham LE12 5RD, United Kingdom
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122
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Yin R, Han K, Heller W, Albert A, Dobrev PI, Zažímalová E, Schäffner AR. Kaempferol 3-O-rhamnoside-7-O-rhamnoside is an endogenous flavonol inhibitor of polar auxin transport in Arabidopsis shoots. THE NEW PHYTOLOGIST 2014; 201:466-475. [PMID: 24251900 PMCID: PMC4260840 DOI: 10.1111/nph.12558] [Citation(s) in RCA: 112] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 09/15/2013] [Indexed: 05/04/2023]
Abstract
Polar auxin transport (PAT) plays key roles in the regulation of plant growth and development. Flavonoids have been implicated in the inhibition of PAT. However, the active flavonoid derivative(s) involved in this process in vivo has not yet been identified. Here, we provide evidence that a specific flavonol bis-glycoside is correlated with shorter plant stature and reduced PAT. Specific flavonoid-biosynthetic or flavonoid-glycosylating steps were genetically blocked in Arabidopsis thaliana. The differential flavonol patterns established were analyzed by high-performance liquid chromatography (HPLC) and related to altered plant stature. PAT was monitored in stem segments using a radioactive [(3)H]-indole-3-acetic acid tracer. The flavonoid 3-O-glucosyltransferase mutant ugt78d2 exhibited a dwarf stature in addition to its altered flavonol glycoside pattern. This was accompanied by reduced PAT in ugt78d2 shoots. The ugt78d2-dependent growth defects were flavonoid dependent, as they were rescued by genetic blocking of flavonoid biosynthesis. Phenotypic and metabolic analyses of a series of mutants defective at various steps of flavonoid formation narrowed down the potentially active moiety to kaempferol 3-O-rhamnoside-7-O-rhamnoside. Moreover, the level of this compound was negatively correlated with basipetal auxin transport. These results indicate that kaempferol 3-O-rhamnoside-7-O-rhamnoside acts as an endogenous PAT inhibitor in Arabidopsis shoots.
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Affiliation(s)
- Ruohe Yin
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München85764, Neuherberg, Germany
- Present address: Department of Botany and Plant Biology, University of Geneva, Sciences III1211, Geneva 4, Switzerland
- Authors for correspondence: Ruohe Yin, Tel: +41 22 379 3653,
| | - Kerstin Han
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München85764, Neuherberg, Germany
| | - Werner Heller
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München85764, Neuherberg, Germany
| | - Andreas Albert
- Research Unit Environmental Simulation, Helmholtz Zentrum München85764, Neuherberg, Germany
| | - Petre I Dobrev
- Institute of Experimental Botany, Academy of Sciences of the Czech RepublicPrague 6, Czech Republic
| | - Eva Zažímalová
- Institute of Experimental Botany, Academy of Sciences of the Czech RepublicPrague 6, Czech Republic
| | - Anton R Schäffner
- Institute of Biochemical Plant Pathology, Helmholtz Zentrum München85764, Neuherberg, Germany
- Anton R. Schäffner, Tel: +49 89 31872930,
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123
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Li S. Transcriptional control of flavonoid biosynthesis: fine-tuning of the MYB-bHLH-WD40 (MBW) complex. PLANT SIGNALING & BEHAVIOR 2014; 9:e27522. [PMID: 24393776 PMCID: PMC4091223 DOI: 10.4161/psb.27522] [Citation(s) in RCA: 202] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Flavonoids are plant secondary polyphenolic metabolites and fulfil many vital biological functions, offering a valuable metabolic and genetic model for studying transcriptional control of gene expression. Arabidopsis thaliana mainly accumulates 3 types of flavonoids, including flavonols, anthocyanins, and proanthocyanidins (PAs). Flavonoid biosynthesis involves a multitude of well-characterized enzymatic and regulatory proteins. Three R2R3-MYB proteins (MYB11, MYB12, and MYB111) control flavonol biosynthesis via activating the early biosynthetic steps, whereas the production of anthocyanins and PAs requires the MYB-bHLH-WD40 (MBW) complex to activate the late biosynthetic genes. Additional regulators of flavonoid biosynthesis have recently come to light, which interact with R2R3-MYBs or bHLHs to organize or disrupt the formation of the MBW complex, leading to enhanced or compromised flavonoid production. This mini-review gives an overview of how these novel players modulate flavonoid metabolism and thus plant developmental processes and further proposes a fine-tuning mechanism to complete the complex regulatory network controlling flavonoid biosynthesis.
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It Takes More Than Two to Tango: Regulation of Plant ABC Transporters. SIGNALING AND COMMUNICATION IN PLANTS 2014. [DOI: 10.1007/978-3-319-06511-3_13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Li S, Zachgo S. TCP3 interacts with R2R3-MYB proteins, promotes flavonoid biosynthesis and negatively regulates the auxin response in Arabidopsis thaliana. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2013; 76:901-13. [PMID: 24118612 DOI: 10.1111/tpj.12348] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Revised: 09/16/2013] [Accepted: 10/01/2013] [Indexed: 05/20/2023]
Abstract
TCP proteins belong to the plant-specific bHLH transcription factor family, and function as key regulators of diverse developmental processes. Functional redundancy amongst family members and post-transcriptional down-regulation by miRJAW of several TCP genes complicate their functional characterization. Here, we explore the role of TCP3 by analyzing transgenic plants expressing miRJAW-resistant mTCP3 and dominant-negative TCP3SRDX. Seedlings and seeds of mTCP3 plants were found to hyper-accumulate flavonols, anthocyanins and proanthocyanidins, whereas levels of proanthocyanidins were slightly reduced in TCP3SRDX plants. R2R3-MYB proteins control not only early flavonoid biosynthetic steps but also activate late flavonoid biosynthetic genes by forming ternary R2R3-MYB/bHLH/WD40 (MBW) complexes. TCP3 interacted in yeast with R2R3-MYB proteins, which was further confirmed in planta using BiFC experiments. Yeast three-hybrid assays revealed that TCP3 significantly strengthened the transcriptional activation capacity of R2R3-MYBs bound by the bHLH protein TT8. Transcriptome analysis of mTCP3 and TCP3SRDX plants supported a role for TCP3 in enhancing flavonoid biosynthesis. Moreover, several auxin-related developmental abnormalities were observed in mTCP3 plants. Transcriptome data coupled with studies of an auxin response reporter and auxin efflux carriers showed that TCP3 negatively modulates the auxin response, probably by compromising auxin transport capacity. Genetic experiments revealed that the chalcone synthase mutant tt4-11 lacking flavonoid biosynthesis abrogated the auxin-related defects caused by mTCP3. Together, these data suggest that TCP3 interactions with R2R3-MYBs lead to enhanced flavonoid production, which further negatively modulates the auxin response.
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Affiliation(s)
- Shutian Li
- Department of Botany, Osnabrück University, Barbarastr. 11, 49076, Osnabrück, Germany
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Wabnik K, Robert HS, Smith RS, Friml J. Modeling framework for the establishment of the apical-basal embryonic axis in plants. Curr Biol 2013; 23:2513-8. [PMID: 24291090 DOI: 10.1016/j.cub.2013.10.038] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 09/17/2013] [Accepted: 10/15/2013] [Indexed: 11/17/2022]
Abstract
The apical-basal axis of the early plant embryo determines the body plan of the adult organism. To establish a polarized embryonic axis, plants evolved a unique mechanism that involves directional, cell-to-cell transport of the growth regulator auxin. Auxin transport relies on PIN auxin transporters, whose polar subcellular localization determines the flow directionality. PIN-mediated auxin transport mediates the spatial and temporal activity of the auxin response machinery that contributes to embryo patterning processes, including establishment of the apical (shoot) and basal (root) embryo poles. However, little is known of upstream mechanisms guiding the (re)polarization of auxin fluxes during embryogenesis. Here, we developed a model of plant embryogenesis that correctly generates emergent cell polarities and auxin-mediated sequential initiation of apical-basal axis of plant embryo. The model relies on two precisely localized auxin sources and a feedback between auxin and the polar, subcellular PIN transporter localization. Simulations reproduced PIN polarity and auxin distribution, as well as previously unknown polarization events during early embryogenesis. The spectrum of validated model predictions suggests that our model corresponds to a minimal mechanistic framework for initiation and orientation of the apical-basal axis to guide both embryonic and postembryonic plant development.
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Affiliation(s)
- Krzysztof Wabnik
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB) and Department of Plant Biotechnology and Genetics, Ghent University, Technologiepark 927, 9052 Gent, Belgium
| | - Hélène S Robert
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB) and Department of Plant Biotechnology and Genetics, Ghent University, Technologiepark 927, 9052 Gent, Belgium; Mendel Centre for Genomics and Proteomics of Plants Systems, Central European Institute of Technology (CEITEC), Masaryk University, 625 00 Brno, Czech Republic
| | - Richard S Smith
- Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland; Department of Comparative Development and Genetics, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany
| | - Jiří Friml
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB) and Department of Plant Biotechnology and Genetics, Ghent University, Technologiepark 927, 9052 Gent, Belgium; Mendel Centre for Genomics and Proteomics of Plants Systems, Central European Institute of Technology (CEITEC), Masaryk University, 625 00 Brno, Czech Republic; Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria.
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Van Oosten MJ, Sharkhuu A, Batelli G, Bressan RA, Maggio A. The Arabidopsis thaliana mutant air1 implicates SOS3 in the regulation of anthocyanins under salt stress. PLANT MOLECULAR BIOLOGY 2013; 83:405-15. [PMID: 23925404 DOI: 10.1007/s11103-013-0099-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 06/21/2013] [Indexed: 05/05/2023]
Abstract
The accumulation of anthocyanins in plants exposed to salt stress has been largely documented. However, the functional link and regulatory components underlying the biosynthesis of these molecules during exposure to stress are largely unknown. In a screen of second site suppressors of the salt overly sensitive3-1 (sos3-1) mutant, we isolated the anthocyanin-impaired-response-1 (air1) mutant. air1 is unable to accumulate anthocyanins under salt stress, a key phenotype of sos3-1 under high NaCl levels (120 mM). The air1 mutant showed a defect in anthocyanin production in response to salt stress but not to other stresses such as high light, low phosphorous, high temperature or drought stress. This specificity indicated that air1 mutation did not affect anthocyanin biosynthesis but rather its regulation in response to salt stress. Analysis of this mutant revealed a T-DNA insertion at the first exon of an Arabidopsis thaliana gene encoding for a basic region-leucine zipper transcription factor. air1 mutants displayed higher survival rates compared to wild-type in oxidative stress conditions, and presented an altered expression of anthocyanin biosynthetic genes such as F3H, F3'H and LDOX in salt stress conditions. The results presented here indicate that AIR1 is involved in the regulation of various steps of the flavonoid and anthocyanin accumulation pathways and is itself regulated by the salt-stress response signalling machinery. The discovery and characterization of AIR1 opens avenues to dissect the connections between abiotic stress and accumulation of antioxidants in the form of flavonoids and anthocyanins.
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Affiliation(s)
- Michael James Van Oosten
- Department of Agriculture, University of Naples "Federico II", Via Università 100, 80055, Portici, Italy
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Buer CS, Kordbacheh F, Truong TT, Hocart CH, Djordjevic MA. Alteration of flavonoid accumulation patterns in transparent testa mutants disturbs auxin transport, gravity responses, and imparts long-term effects on root and shoot architecture. PLANTA 2013; 238:171-89. [PMID: 23624937 DOI: 10.1007/s00425-013-1883-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 04/08/2013] [Indexed: 05/18/2023]
Abstract
Flavonoids have broad cross-kingdom biological activity. In Arabidopsis, flavonoid accumulation in specific tissues, notably the root elongation zone and root/shoot junction modulate auxin transport, affect root gravitropism, and influence overall plant architecture. The relative contribution made by aglycones and their glycosides remains undetermined, and the longer-term phenotypic effects of altered flavonoid accumulation are not fully assessed. We tested Arabidopsis thaliana mutants that accumulate different flavonoids to determine which flavonoids were causing these affects. Tandem mass spectrometry and in situ fluorescence localisation were used to determine the in vivo levels of aglycones in specific tissues of 11 transparent testa mutants. We measured rootward and shootward auxin transport, gravitropic responses, and identified the long-term changes to root and shoot architecture. Unexpected aglycone species accumulated in vivo in several flavonoid-pathway mutants, and lower aglycone levels occurred in transcription factor mutants. Mutants accumulating more quercetin and quercetin-glycosides changed the greatest in auxin transport, gravitropism, and aerial tissue growth. Early flavonoid-pathway mutants showed aberrant lateral root initiation patterns including clustered lateral root initiations at a single site. Transcription factor mutants had multiple phenotypes including shallow root systems. These results confirm that aglycones are present at very low levels, show that lateral root initiation is perturbed in early flavonoid-pathway mutants, and indicate that altered flavonoid accumulation affects multiple aspects of plant architecture.
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Affiliation(s)
- Charles S Buer
- Plant Sciences Division, Research School of Biology, College of Medicine, Biology, and Environment, The Australian National University, Linneaus Bldg #134, Linneaus Way, Canberra, ACT 0200, Australia
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129
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Rípodas C, Via VD, Aguilar OM, Zanetti ME, Blanco FA. Knock-down of a member of the isoflavone reductase gene family impairs plant growth and nodulation in Phaseolus vulgaris. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 68:81-9. [PMID: 23644278 DOI: 10.1016/j.plaphy.2013.04.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Accepted: 04/08/2013] [Indexed: 05/05/2023]
Abstract
Flavonoids and isoflavonoids participate in the signaling exchange between roots of legumes and nitrogen-fixing rhizobia and can promote division of cortical cells during nodule formation by inhibiting auxin transport. Here, we report the characterization of a member of the common bean isoflavone reductase (EC 1.3.1.45, PvIFR1) gene family, an enzyme that participates in the last steps of the biosynthetic pathway of isoflavonoids. Transcript levels of PvIFR1 were detected preferentially in the susceptible zone of roots, augmented upon nitrogen starvation and in response to Rhizobium etli inoculation at very early stages of the interaction. Knockdown of PvIFR1 mediated by RNA interference (RNAi) in common bean composite plants resulted in a reduction of shoot and root length. Furthermore, reduction of PvIFR1 mRNAs also affected growth of lateral roots after emergence, a stage in which auxins are required to establish a persistent meristem. Upon inoculation, the number of nodules formed by different strains of R. etli was significantly lower in IFR RNAi than in control roots. Transcript levels of two auxin-regulated genes are consistent with lower levels of auxin in PvIFR1 silenced roots. These results suggest a complex role of PvIFR1 during plant growth, root development and symbiosis, all processes in which auxin transport is involved.
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Affiliation(s)
- Carolina Rípodas
- Instituto de Biotecnología y Biología Molecular, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CCT-La Plata, CONICET, Calle 115 y 49 s/n, CP 1900, La Plata, Buenos Aires, Argentina
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130
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Ma R, Sun L, Chen X, Jiang R, Sun H, Zhao D. Proteomic changes in different growth periods of ginseng roots. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2013; 67:20-32. [PMID: 23537955 DOI: 10.1016/j.plaphy.2013.02.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2012] [Accepted: 02/27/2013] [Indexed: 06/02/2023]
Abstract
For the first time, proteomics and biochemical variables have been employed to unravel the growth strategies for the different root growth periods of ginseng (Panax ginseng CA May., Araliaceae). Enzymatic activities and cellular contents, except for starch, related to defence and metabolism were significantly increased in the slow-growth period but decreased in the fast-growth period. Proteomic characterisation by two-dimensional gel electrophoresis (2DE) showed 83 differentially expressed spots; 62 spots were up-regulated and 21 spots were down-regulated in the slow-growth period when compared to the fast-growth period. The identification of these spots indicated that the major groups of differential proteins were associated with energy metabolism (37%) and defence (17%), which was consistent with the changes observed in the biochemical measurements. These results clearly demonstrate that ginseng stores energy during its fast-growth period to promote root elongation, whereas it expends energy to improve the synthesis of secondary metabolites and stress resistance during its slow-growth period. The levels of many proteins were changed during the conversion period from fast to slow growth, providing new insights into ginseng proteome evolution. The proposed hypothetical model explains the interaction of metabolic proteins associated with the growth strategies of ginseng.
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Affiliation(s)
- Rui Ma
- Changchun University of Chinese Medicine, Jilin 130117, PR China; College of Biology and Chemistry, Beihua University, 15 Jilin Street, Jilin, Jilin Province 132013, PR China
| | - Liwei Sun
- College of Biology and Chemistry, Beihua University, 15 Jilin Street, Jilin, Jilin Province 132013, PR China.
| | - Xuenan Chen
- College of Biology and Chemistry, Beihua University, 15 Jilin Street, Jilin, Jilin Province 132013, PR China
| | - Rui Jiang
- Changchun University of Chinese Medicine, Jilin 130117, PR China; College of Biology and Chemistry, Beihua University, 15 Jilin Street, Jilin, Jilin Province 132013, PR China
| | - Hang Sun
- College of Biology and Chemistry, Beihua University, 15 Jilin Street, Jilin, Jilin Province 132013, PR China
| | - Daqing Zhao
- Changchun University of Chinese Medicine, Jilin 130117, PR China.
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131
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Peer WA, Cheng Y, Murphy AS. Evidence of oxidative attenuation of auxin signalling. JOURNAL OF EXPERIMENTAL BOTANY 2013; 64:2629-39. [PMID: 23709674 DOI: 10.1093/jxb/ert152] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Indole-3-acetic acid (IAA) is the principle auxin in Arabidopsis and is synthesized primarily in meristems and nodes. Auxin is transported to distal parts of the plant in response to developmental programming or environmental stimuli to activate cell-specific responses. As with any signalling event, the signal must be attenuated to allow the system to reset. Local auxin accumulations are thus reduced by conjugation or catabolism when downstream responses have reached their optima. In most cell types, localized auxin accumulation increases both reactive oxygen species (ROS) and an irreversible catabolic product 2-oxindole-3-acid acid (oxIAA). oxIAA is inactive and does not induce expression of the auxin-responsive reporters DR5 or 2XD0. Here it is shown that oxIAA is not transported from cell to cell, although it appears to be a substrate for the ATP-binding cassette subfamily G (ABCG) transporters that are positioned primarily on the outer lateral surface of the root epidermis. However, oxIAA and oxIAA-Glc levels are higher in ABCB mutants that accumulate auxin due to defective cellular export. Auxin-induced ROS production appears to be at least partially mediated by the NAD(P)H oxidase RbohD. oxIAA levels are higher in mutants that lack ROS-scavenging flavonoids (tt4) and are lower in mutants that accumulate excess flavonols (tt3). These data suggest a model where IAA signalling is attenuated by IAA catabolism to oxIAA. Flavonoids appear to buffer ROS accumulations that occur with localized increases in IAA. This buffering of IAA oxidation would explain some growth responses observed in flavonoid-deficient mutants that cannot be explained by their established role in partially inhibiting auxin transport.
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Affiliation(s)
- Wendy Ann Peer
- Department of Environmental Science and Technology, University of Maryland, College Park, MD 20742, USA.
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132
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Sotelo-Silveira M, Cucinotta M, Chauvin AL, Chávez Montes RA, Colombo L, Marsch-Martínez N, de Folter S. Cytochrome P450 CYP78A9 is involved in Arabidopsis reproductive development. PLANT PHYSIOLOGY 2013; 162:779-99. [PMID: 23610218 PMCID: PMC3668070 DOI: 10.1104/pp.113.218214] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2013] [Accepted: 04/16/2013] [Indexed: 05/18/2023]
Abstract
Synchronized communication between gametophytic and sporophytic tissue is crucial for successful reproduction, and hormones seem to have a prominent role in it. Here, we studied the role of the Arabidopsis (Arabidopsis thaliana) cytochrome P450 CYP78A9 enzyme during reproductive development. First, controlled pollination experiments indicate that CYP78A9 responds to fertilization. Second, while CYP78A9 overexpression can uncouple fruit development from fertilization, the cyp78a8 cyp78a9 loss-of-function mutant has reduced seed set due to outer ovule integument development arrest, leading to female sterility. Moreover, CYP78A9 has a specific expression pattern in inner integuments in early steps of ovule development as well as in the funiculus, embryo, and integuments of developing seeds. CYP78A9 overexpression did not change the response to the known hormones involved in flower development and fruit set, and it did not seem to have much effect on the major known hormonal pathways. Furthermore, according to previous predictions, perturbations in the flavonol biosynthesis pathway were detected in cyp78a9, cyp78a8 cyp78a9, and empty siliques (es1-D) mutants. However, it appeared that they do not cause the observed phenotypes. In summary, these results add new insights into the role of CYP78A9 in plant reproduction and present, to our knowledge, the first characterization of metabolite differences between mutants in this gene family.
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Tegg RS, Shabala SN, Cuin TA, Davies NW, Wilson CR. Enhanced resistance to the cellulose biosynthetic inhibitors, thaxtomin A and isoxaben in Arabidopsis thaliana mutants, also provides specific co-resistance to the auxin transport inhibitor, 1-NPA. BMC PLANT BIOLOGY 2013; 13:76. [PMID: 23638731 PMCID: PMC3655924 DOI: 10.1186/1471-2229-13-76] [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: 10/19/2012] [Accepted: 04/30/2013] [Indexed: 05/06/2023]
Abstract
BACKGROUND Thaxtomin A (TA) is a phytotoxin produced by plant pathogenic Streptomyces spp. responsible for potato common scab. TA inhibits cellulose biosynthesis in expanding plant tissues and is essential for disease induction. Auxin treatment of various plant tissues has been repeatedly demonstrated to inhibit TA toxicity and to reduce common scab. This work utilises Arabidopsis thaliana mutants with resistance to cellulose biosynthesis inhibitors (CBIs) to investigate the interaction between TA, other CBIs and auxins. RESULTS Three CBI resistant A. thaliana mutants; txr1-1 (tolerance to TA), ixr1-1 (tolerance to isoxaben - IXB) and KOR1 (cellulose deficiency), showed no altered root growth response to treatment with natural or synthetic auxins, nor with the auxin efflux transport inhibitor 2,3,5-Triiodobenzoic acid (TIBA). However, all mutants had significantly enhanced tolerance to 1-napthylphthalamic acid (NPA), another auxin efflux transport inhibitor, which blocks polar auxin transport at a site distinct from TIBA. NPA tolerance of txr1-1 and ixr1-1 was further supported by electrophysiological analysis of net H+ fluxes in the mature, but not elongation zone of roots. All three mutants showed increased tolerance to IXB, but only txr1-1 showed tolerance to TA. No mutant showed enhanced tolerance to a third CBI, dichlobenil (DCB). CONCLUSIONS We have demonstrated that plant tolerance to TA and IXB, as well as cell wall synthesis modifications in roots, have resulted in specific co-resistance to NPA but not TIBA. This suggests that CBI resistance has an impact on polar auxin efflux transport processes associated with the NPA binding protein. We also show that NPA inhibitory response in roots occurs in the mature root zone but not the elongation zone. Responses of mutants to CBIs indicate a similar, but not identical mode of action of TA and IXB, in contrast to DCB.
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Affiliation(s)
- Robert S Tegg
- Tasmanian Institute of Agriculture (TIA), University of Tasmania (UTAS), 13 St John’s Ave, New Town, Tasmania, 7008, Australia
| | - Sergey N Shabala
- TIA, UTAS, Private Bag 54, Tasmania, Hobart, TAS 7001, Australia
| | - Tracey A Cuin
- TIA, UTAS, Private Bag 54, Tasmania, Hobart, TAS 7001, Australia
| | - Noel W Davies
- Central Science Laboratory, University of Tasmania, Private Bag 74, Tasmania, Hobart, 7001, Australia
| | - Calum R Wilson
- Tasmanian Institute of Agriculture (TIA), University of Tasmania (UTAS), 13 St John’s Ave, New Town, Tasmania, 7008, Australia
- TIA, UTAS, Private Bag 54, Tasmania, Hobart, TAS 7001, Australia
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Pourcel L, Irani NG, Koo AJK, Bohorquez-Restrepo A, Howe GA, Grotewold E. A chemical complementation approach reveals genes and interactions of flavonoids with other pathways. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2013; 74:383-97. [PMID: 23360095 DOI: 10.1111/tpj.12129] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Revised: 01/16/2013] [Accepted: 01/24/2013] [Indexed: 05/20/2023]
Abstract
In addition to the classical functions of flavonoids in the response to biotic/abiotic stress conditions, these phenolic compounds have been implicated in the modulation of various developmental processes. These findings suggest that flavonoids are more integral components of the plant signaling machinery than traditionally recognized. To understand how flux through the flavonoid pathway affects plant cellular processes, we used wild-type and chalcone isomerase mutant (transparent testa 5, tt5) seedlings grown under anthocyanin inductive conditions, in the presence or absence of the flavonoid intermediate naringenin, the product of the chalcone isomerase enzyme. Because flavonoid biosynthetic genes are expressed under anthocyanin inductive conditions regardless of whether anthocyanins are formed or not, this system provides an excellent opportunity to specifically investigate the molecular changes associated with increased flux through the flavonoid pathway. By assessing genome-wide mRNA accumulation changes in naringenin-treated and untreated tt5 and wild-type seedlings, we identified a flavonoid-responsive gene set associated with cellular trafficking, stress responses and cellular signaling. Jasmonate biosynthetic genes were highly represented among the signaling pathways induced by increased flux through the flavonoid pathway. In contrast to studies showing a role for flavonoids in the control of auxin transport, no effect on auxin-responsive genes was observed. Taken together, our data suggest that Arabidopsis can sense flavonoids as a signal for multiple fundamental cellular processes.
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Affiliation(s)
- Lucille Pourcel
- Center for Applied Plant Sciences and Department of Molecular Genetics, Ohio State University, Columbus, OH 43210, USA
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135
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Dare AP, Tomes S, Jones M, McGhie TK, Stevenson DE, Johnson RA, Greenwood DR, Hellens RP. Phenotypic changes associated with RNA interference silencing of chalcone synthase in apple (Malus × domestica). THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2013; 74:398-410. [PMID: 23398045 DOI: 10.1111/tpj.12140] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Revised: 12/21/2012] [Accepted: 01/24/2013] [Indexed: 05/19/2023]
Abstract
We have identified in apple (Malus × domestica) three chalcone synthase (CHS) genes. In order to understand the functional redundancy of this gene family RNA interference knockout lines were generated where all three of these genes were down-regulated. These lines had no detectable anthocyanins and radically reduced concentrations of dihydrochalcones and flavonoids. Surprisingly, down-regulation of CHS also led to major changes in plant development, resulting in plants with shortened internode lengths, smaller leaves and a greatly reduced growth rate. Microscopic analysis revealed that these phenotypic changes extended down to the cellular level, with CHS-silenced lines showing aberrant cellular organisation in the leaves. Fruit collected from one CHS-silenced line was smaller than the 'Royal Gala' controls, lacked flavonoids in the skin and flesh and also had changes in cell morphology. Auxin transport experiments showed increased rates of auxin transport in a CHS-silenced line compared with the 'Royal Gala' control. As flavonoids are well known to be key modulators of auxin transport, we hypothesise that the removal of almost all flavonoids from the plant by CHS silencing creates a vastly altered environment for auxin transport to occur and results in the observed changes in growth and development.
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Affiliation(s)
- Andrew P Dare
- The New Zealand Institute for Plant and Food Research Ltd, Private Bag 92169, Auckland 1141, New Zealand.
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136
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Naoumkina M, Hinchliffe DJ, Turley RB, Bland JM, Fang DD. Integrated metabolomics and genomics analysis provides new insights into the fiber elongation process in Ligon lintless-2 mutant cotton (Gossypium hirsutum L.). BMC Genomics 2013; 14:155. [PMID: 23497242 PMCID: PMC3605188 DOI: 10.1186/1471-2164-14-155] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2012] [Accepted: 03/01/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The length of cotton fiber is an important agronomic trait characteristic that directly affects the quality of yarn and fabric. The cotton (Gossypium hirsutum L.) fiber mutation, Ligon lintless-2, is controlled by a single dominant gene (Li(2)) and results in extremely shortened lint fibers on mature seeds with no visible pleiotropic effects on vegetative growth and development. The Li(2) mutant phenotype provides an ideal model system to study fiber elongation. To understand metabolic processes involved in cotton fiber elongation, changes in metabolites and transcripts in the Li(2) mutant fibers were compared to wild-type fibers during development. RESULTS Principal component analysis of metabolites from GC-MS data separated Li(2) mutant fiber samples from WT fiber samples at the WT elongation stage, indicating that the Li(2) mutation altered the metabolome of the mutant fibers. The observed alterations in the Li(2) metabolome included significant reductions in the levels of detected free sugars, sugar alcohols, sugar acids, and sugar phosphates. Biological processes associated with carbohydrate biosynthesis, cell wall loosening, and cytoskeleton were also down-regulated in Li(2) fibers. Gamma-aminobutyric acid, known as a signaling factor in many organisms, was significantly elevated in mutant fibers. Higher accumulation of 2-ketoglutarate, succinate, and malate suggested higher nitrate assimilation in the Li(2) line. Transcriptional activation of genes involved in nitrogen compound metabolism along with changes in the levels of nitrogen transport amino acids suggested re-direction of carbon flow into nitrogen metabolism in Li(2) mutant fibers. CONCLUSIONS This report provides the first comprehensive analysis of metabolite and transcript changes in response to the Li(2) mutation in elongating fibers. A number of factors associated with cell elongation found in this study will facilitate further research in understanding metabolic processes of cotton fiber elongation.
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Affiliation(s)
- Marina Naoumkina
- Cotton Fiber Bioscience Research Unit, USDA-ARS, Southern Regional Research Center, New Orleans, LA 70124, USA.
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Peng Y, Ma W, Chen L, Yang L, Li S, Zhao H, Zhao Y, Jin W, Li N, Bevan MW, Li X, Tong Y, Li Y. Control of root meristem size by DA1-RELATED PROTEIN2 in Arabidopsis. PLANT PHYSIOLOGY 2013; 161:1542-56. [PMID: 23296689 PMCID: PMC3585615 DOI: 10.1104/pp.112.210237] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2012] [Accepted: 01/03/2013] [Indexed: 05/21/2023]
Abstract
The control of organ growth by coordinating cell proliferation and differentiation is a fundamental developmental process. In plants, postembryonic root growth is sustained by the root meristem. For maintenance of root meristem size, the rate of cell differentiation must equal the rate of cell division. Cytokinin and auxin interact to affect the cell proliferation and differentiation balance and thus control root meristem size. However, the genetic and molecular mechanisms that determine root meristem size still remain largely unknown. Here, we report that da1-related protein2 (dar2) mutants produce small root meristems due to decreased cell division and early cell differentiation in the root meristem of Arabidopsis (Arabidopsis thaliana). dar2 mutants also exhibit reduced stem cell niche activity in the root meristem. DAR2 encodes a Lin-11, Isl-1, and Mec-3 domain-containing protein and shows an expression peak in the border between the transition zone and the elongation zone. Genetic analyses show that DAR2 functions downstream of cytokinin and SHORT HYPOCOTYL2 to maintain normal auxin distribution by influencing auxin transport. Further results indicate that DAR2 acts through the PLETHORA pathway to influence root stem cell niche activity and therefore control root meristem size. Collectively, our findings identify the role of DAR2 in root meristem size control and provide a novel link between several key regulators influencing root meristem size.
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138
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Remy E, Cabrito TR, Baster P, Batista RA, Teixeira MC, Friml J, Sá-Correia I, Duque P. A major facilitator superfamily transporter plays a dual role in polar auxin transport and drought stress tolerance in Arabidopsis. THE PLANT CELL 2013; 25:901-26. [PMID: 23524662 PMCID: PMC3634696 DOI: 10.1105/tpc.113.110353] [Citation(s) in RCA: 135] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Revised: 02/01/2013] [Accepted: 03/05/2013] [Indexed: 05/18/2023]
Abstract
Many key aspects of plant development are regulated by the polarized transport of the phytohormone auxin. Cellular auxin efflux, the rate-limiting step in this process, has been shown to rely on the coordinated action of PIN-formed (PIN) and B-type ATP binding cassette (ABCB) carriers. Here, we report that polar auxin transport in the Arabidopsis thaliana root also requires the action of a Major Facilitator Superfamily (MFS) transporter, Zinc-Induced Facilitator-Like 1 (ZIFL1). Sequencing, promoter-reporter, and fluorescent protein fusion experiments indicate that the full-length ZIFL1.1 protein and a truncated splice isoform, ZIFL1.3, localize to the tonoplast of root cells and the plasma membrane of leaf stomatal guard cells, respectively. Using reverse genetics, we show that the ZIFL1.1 transporter regulates various root auxin-related processes, while the ZIFL1.3 isoform mediates drought tolerance by regulating stomatal closure. Auxin transport and immunolocalization assays demonstrate that ZIFL1.1 indirectly modulates cellular auxin efflux during shootward auxin transport at the root tip, likely by regulating plasma membrane PIN2 abundance. Finally, heterologous expression in yeast revealed that ZIFL1.1 and ZIFL1.3 share H(+)-coupled K(+) transport activity. Thus, by determining the subcellular and tissue distribution of two isoforms, alternative splicing dictates a dual function for the ZIFL1 transporter. We propose that this MFS carrier regulates stomatal movements and polar auxin transport by modulating potassium and proton fluxes in Arabidopsis cells.
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Affiliation(s)
- Estelle Remy
- Instituto Gulbenkian de Ciência, 2780-156 Oeiras, Portugal
| | - Tânia R. Cabrito
- Institute for Biotechnology and BioEngineering, Center for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal
| | - Pawel Baster
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
| | | | - Miguel C. Teixeira
- Institute for Biotechnology and BioEngineering, Center for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal
| | - Jiri Friml
- Department of Plant Systems Biology, Flanders Institute for Biotechnology (VIB), and Department of Plant Biotechnology and Bioinformatics, Ghent University, 9052 Ghent, Belgium
- Institute of Science and Technology Austria, 3400 Klosterneuburg, Austria
| | - Isabel Sá-Correia
- Institute for Biotechnology and BioEngineering, Center for Biological and Chemical Engineering, Department of Bioengineering, Instituto Superior Técnico, Technical University of Lisbon, 1049-001 Lisbon, Portugal
| | - Paula Duque
- Instituto Gulbenkian de Ciência, 2780-156 Oeiras, Portugal
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139
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Makkena S, Lamb RS. The bHLH transcription factor SPATULA regulates root growth by controlling the size of the root meristem. BMC PLANT BIOLOGY 2013; 13:1. [PMID: 23924433 PMCID: PMC3583232 DOI: 10.1186/1471-2229-13-1] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 12/12/2012] [Indexed: 05/18/2023]
Abstract
BACKGROUND The Arabidopsis thaliana gene SPATULA (SPT), encoding a bHLH transcription factor, was originally identified for its role in pistil development. SPT is necessary for the growth and development of all carpel margin tissues including the style, stigma, septum and transmitting tract. Since then, it has been shown to have pleiotropic roles during development, including restricting the meristematic region of the leaf primordia and cotyledon expansion. Although SPT is expressed in roots, its role in this organ has not been investigated. RESULTS An analysis of embryo and root development showed that loss of SPT function causes an increase in quiescent center size in both the embryonic and postembryonic stem cell niches. In addition, root meristem size is larger due to increased division, which leads to a longer primary root. spt mutants exhibit other pleiotropic developmental phenotypes, including more flowers, shorter internodes and an extended flowering period. Genetic and molecular analysis suggests that SPT regulates cell proliferation in parallel to gibberellic acid as well as affecting auxin accumulation or transport. CONCLUSIONS Our data suggest that SPT functions in growth control throughout sporophytic growth of Arabidopsis, but is not necessary for cell fate decisions except during carpel development. SPT functions independently of gibberellic acid during root development, but may play a role in regulating auxin transport or accumulation. Our data suggests that SPT plays a role in control of root growth, similar to its roles in above ground tissues.
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Affiliation(s)
- Srilakshmi Makkena
- Plant Cellular and Molecular Biology Graduate Program, The Ohio State University, Columbus, OH, USA
| | - Rebecca S Lamb
- Plant Cellular and Molecular Biology Graduate Program, The Ohio State University, Columbus, OH, USA
- Department of Molecular Genetics, The Ohio State University, Columbus, OH, USA
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140
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Withers JC, Shipp MJ, Rupasinghe SG, Sukumar P, Schuler MA, Muday GK, Wyatt SE. Gravity Persistent Signal 1 (GPS1) reveals novel cytochrome P450s involved in gravitropism. AMERICAN JOURNAL OF BOTANY 2013; 100:183-193. [PMID: 23284057 DOI: 10.3732/ajb.1200436] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
PREMISE Gravity is an important environmental factor that affects growth and development of plants. In response to changes in gravity, directional growth occurs along the major axes and lateral branches of both shoots and roots. The gravity persistent signal (gps) mutants of Arabidopsis thaliana were previously identified as having an altered response to gravity when reoriented relative to the gravity vector in the cold, with the gps1 mutant exhibiting a complete loss of tropic response under these conditions. METHODS Thermal asymmetric interlaced (TAIL) PCR was used to identify the gene defective in gps1. Gene expression data, molecular modeling and computational substrate dockings, quantitative RT-PCR analyses, reporter gene fusions, and physiological analyses of knockout mutants were used to characterize the genes identified. RESULTS Cloning of the gene defective in gps1 and genetic complementation revealed that GPS1 encodes CYP705A22, a cytochrome P450 monooxygenase (P450). CYP705A5, a closely related family member, was identified as expressed specifically in roots in response to gravistimulation, and a mutation affecting its expression resulted in a delayed gravity response, increased flavonol levels, and decreased basipetal auxin transport. Molecular modeling coupled with in silico substrate docking and diphenylboric acid 2-aminoethyl ester (DBPA) staining indicated that these P450s are involved in biosynthesis of flavonoids potentially involved in auxin transport. CONCLUSION The characterization of two novel P450s (CYP705A22 and CYP705A5) and their role in the gravity response has offered new insights into the regulation of the genetic and physiological controls of plant gravitropism.
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Affiliation(s)
- John C Withers
- Department of Environmental and Plant Biology, 317 Porter Hall, Ohio University, Athens, Ohio 45701, USA
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141
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142
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SCF(TIR1/AFB)-auxin signalling regulates PIN vacuolar trafficking and auxin fluxes during root gravitropism. EMBO J 2012; 32:260-74. [PMID: 23211744 PMCID: PMC3553380 DOI: 10.1038/emboj.2012.310] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Accepted: 10/19/2012] [Indexed: 01/31/2023] Open
Abstract
The distribution of the phytohormone auxin regulates many aspects of plant development including growth response to gravity. Gravitropic root curvature involves coordinated and asymmetric cell elongation between the lower and upper side of the root, mediated by differential cellular auxin levels. The asymmetry in the auxin distribution is established and maintained by a spatio-temporal regulation of the PIN-FORMED (PIN) auxin transporter activity. We provide novel insights into the complex regulation of PIN abundance and activity during root gravitropism. We show that PIN2 turnover is differentially regulated on the upper and lower side of gravistimulated roots by distinct but partially overlapping auxin feedback mechanisms. In addition to regulating transcription and clathrin-mediated internalization, auxin also controls PIN abundance at the plasma membrane by promoting their vacuolar targeting and degradation. This effect of elevated auxin levels requires the activity of SKP-Cullin-F-box(TIR1/AFB) (SCF(TIR1/AFB))-dependent pathway. Importantly, also suboptimal auxin levels mediate PIN degradation utilizing the same signalling pathway. These feedback mechanisms are functionally important during gravitropic response and ensure fine-tuning of auxin fluxes for maintaining as well as terminating asymmetric growth.
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143
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Liu Y, Gao L, Liu L, Yang Q, Lu Z, Nie Z, Wang Y, Xia T. Purification and characterization of a novel galloyltransferase involved in catechin galloylation in the tea plant (Camellia sinensis). J Biol Chem 2012; 287:44406-17. [PMID: 23132863 DOI: 10.1074/jbc.m112.403071] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Catechins (flavan-3-ols), the most important secondary metabolites in the tea plant, have positive effects on human health and are crucial in defense against pathogens of the tea plant. The aim of this study was to elucidate the biosynthetic pathway of galloylated catechins in the tea plant. The results suggested that galloylated catechins were biosynthesized via 1-O-glucose ester-dependent two-step reactions by acyltransferases, which involved two enzymes, UDP-glucose:galloyl-1-O-β-D-glucosyltransferase (UGGT) and a newly discovered enzyme, epicatechin:1-O-galloyl-β-D-glucose O-galloyltransferase (ECGT). In the first reaction, the galloylated acyl donor β-glucogallin was biosynthesized by UGGT from gallic acid and uridine diphosphate glucose. In the second reaction, galloylated catechins were produced by ECGT catalysis from β-glucogallin and 2,3-cis-flavan-3-ol. 2,3-cis-Flavan-3-ol and 1-O-galloyl-β-D-glucose were appropriate substrates of ECGT rather than 2,3-trans-flavan-3-ol and 1,2,3,4,6-pentagalloylglucose. Purification by more than 1641-fold to apparent homogeneity yielded ECGT with an estimated molecular mass of 241 to 121 kDa by gel filtration. Enzyme activity and SDS-PAGE analysis indicated that the native ECGT might be a dimer, trimer, or tetramer of 60- and/or 58-kDa monomers, and these monomers represent a heterodimer consisting of pairs of 36- or 34- of and 28-kDa subunits. MALDI-TOF-TOF MS showed that the protein SCPL1199 was identified. Epigallocatechin and epicatechin exhibited higher substrate affinities than β-glucogallin. ECGT had an optimum temperature of 30 °C and maximal reaction rates between pH 4.0 and 6.0. The enzyme reaction was inhibited dramatically by phenylmethylsulfonyl fluoride, HgCl(2), and sodium deoxycholate.
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Affiliation(s)
- Yajun Liu
- School of Life Science, Ministry of Education in China, Anhui Agricultural University, 130 West Changjiang Rd, Hefei, Anhui 230036, China
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144
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Fang J, Reichelt M, Hidalgo W, Agnolet S, Schneider B. Tissue-specific distribution of secondary metabolites in rapeseed (Brassica napus L.). PLoS One 2012; 7:e48006. [PMID: 23133539 PMCID: PMC3485038 DOI: 10.1371/journal.pone.0048006] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Accepted: 09/19/2012] [Indexed: 01/13/2023] Open
Abstract
Four different parts, hypocotyl and radicle (HR), inner cotyledon (IC), outer cotyledon (OC), seed coat and endosperm (SE), were sampled from mature rapeseed (Brassica napus L.) by laser microdissection. Subsequently, major secondary metabolites, glucosinolates and sinapine, as well as three minor ones, a cyclic spermidine conjugate and two flavonoids, representing different compound categories, were qualified and quantified in dissected samples by high-performance liquid chromatography with diode array detection and mass spectrometry. No qualitative and quantitative difference of glucosinolates and sinapine was detected in embryo tissues (HR, IC and OC). On the other hand, the three minor compounds were observed to be distributed unevenly in different rapeseed tissues. The hypothetic biological functions of the distribution patterns of different secondary metabolites in rapeseed are discussed.
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Affiliation(s)
- Jingjing Fang
- Max Planck Institute for Chemical Ecology, Jena, Germany
| | | | | | - Sara Agnolet
- Max Planck Institute for Chemical Ecology, Jena, Germany
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145
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Water deficit affected flavonoid accumulation by regulating hormone metabolism in Scutellaria baicalensis Georgi roots. PLoS One 2012; 7:e42946. [PMID: 23077481 PMCID: PMC3471899 DOI: 10.1371/journal.pone.0042946] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Accepted: 07/16/2012] [Indexed: 11/19/2022] Open
Abstract
The content of flavonoids especially baicalin and baicalein determined the medical quality of Scutellaria baicalensis which is a Chinese traditional medicinal plant. Here, we investigated the mechanism responsible for the content and composition of flavonoids in S. baicalensis under water deficit condition. The transcription levels of several genes which are involved in flavonoid biosynthesis were stimulated by water deficit. Under water deficit condition, fifteen up-regulated proteins, three down-regulated proteins and other six proteins were detected by proteomic analysis. The identified proteins include three gibberellin (GA)- or indoleacetic acid (IAA)-related proteins. Decreased endogenous GAs level and increased IAA level were observed in leaves of S. baicalensis which was treated with water deficit. Exogenous application of GA or α-naphthalene acelic acid (NAA) to plants grown under water deficit conditions led to the increase of endogenous GAs and the decrease of IAA and flavonoids, respectively. When the synthesis pathway of GA or IAA in plants was inhibited by application with the inhibitors, flavonoid levels were recovered. These results indicate that water deficit affected flavonoid accumulation might through regulating hormone metabolism in S. baicalensis Georgi.
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146
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Jansen MAK, Coffey AM, Prinsen E. UV-B induced morphogenesis: four players or a quartet? PLANT SIGNALING & BEHAVIOR 2012; 7:1185-7. [PMID: 22899069 PMCID: PMC3489657 DOI: 10.4161/psb.21260] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Low levels of ultraviolet (UV)-radiation alter the morphology of plants. UV-B exposure can lead to shorter petioles and shorter, narrower and/or thicker leaf blades. The resulting decrease in leaf area has been associated with inhibitory UV-B effects on biomass accumulation. In Arabidopsis, UV-B effects on leaf area have variously been attributed to altered cell division, cell expansion or combinations of these two processes. A dedicated UV-B sensory system, crosstalk between flavonoids and auxins, endoreduplication and generic Stress Induced Morphogenic Responses (SIMR) have all been proposed to contribute to the UV-B phenotype. Here, we propose that UV-mediated morphogenesis, rather than being controlled by a single regulatory pathway, is controlled by a regulatory blur involving multiple compensatory molecular and physiological feedback interactions.
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Affiliation(s)
- Marcel A K Jansen
- School of Biological, Earth and Environmental Sciences, University College Cork, Distillery Field, Cork, Ireland.
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147
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Ryu H, Cho H, Choi D, Hwang I. Plant hormonal regulation of nitrogen-fixing nodule organogenesis. Mol Cells 2012; 34:117-26. [PMID: 22820920 PMCID: PMC3887813 DOI: 10.1007/s10059-012-0131-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Revised: 06/14/2012] [Accepted: 06/15/2012] [Indexed: 12/20/2022] Open
Abstract
Legumes have evolved symbiotic interactions with rhizobial bacteria to efficiently utilize nitrogen. Recent progress in symbiosis has revealed several key components of host plants required for nitrogen-fixing nodule organogenesis, in which complicated metabolic and signaling pathways in the host plant are reprogrammed to generate nodules in the cortex upon perception of the rhizobial Nod factor. Following the recognition of Nod factors, plant hormones are likely to be essential throughout nodule organogenesis for integration of developmental and environmental signaling cues into nodule development. Here, we review the molecular events involved in plant hormonal regulation and signaling cross-talk for nitrogen-fixing nodule development, and discuss how these signaling networks are integrated into Nod factor-mediated signaling during plant-microbe interactions.
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Affiliation(s)
- Hojin Ryu
- Department of Life Science, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784,
Korea
| | - Hyunwoo Cho
- Department of Life Science, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784,
Korea
| | - Daeseok Choi
- Department of Life Science, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784,
Korea
| | - Ildoo Hwang
- Department of Life Science, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang 790-784,
Korea
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148
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Hectors K, van Oevelen S, Guisez Y, Prinsen E, Jansen MAK. The phytohormone auxin is a component of the regulatory system that controls UV-mediated accumulation of flavonoids and UV-induced morphogenesis. PHYSIOLOGIA PLANTARUM 2012; 145:594-603. [PMID: 22304327 DOI: 10.1111/j.1399-3054.2012.01590.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
In plants, ultraviolet (UV)-B acclimation is a complex, dynamic process that plays an essential role in preventing UV-B damage to targets such as DNA and the photosynthetic machinery. In this study we tested the hypothesis that the phytohormone auxin is a component of the regulatory system that controls both UV-mediated accumulation of flavonoids and UV-induced morphogenesis. We found that the leaf area of Arabidopsis thaliana Col-0 plants raised under a low dose of UV radiation (0.56 kJ m(-2) daily dose) was, on average, decreased by 23% relative to plants raised in the absence of UV-B, and this was accompanied by a decrease (P = 0.063) in free auxin in young leaf tissues. Compared to Col-0, both the auxin influx mutant axr4-1 and the auxin biosynthesis mutant nit1-3 displayed significantly stronger morphogenic responses, i.e. relative decreases in leaf area were greater for these two mutants. UV exposure also induced accumulation of flavonoids. In Col-0, increases in the concentrations of specific kaempferol derivatives ranged from 2.1- to 19-fold. Thus, UV induces complex changes in flavonoid-glycosylation patterns. Compared to Col-0, three auxin mutants displayed significantly different flavonoid profiles. Thus, based on mutant analysis, it is concluded that the phytohormone auxin plays a role in UV acclimation by regulating flavonoid concentration, flavonoid-glycosylation pattern and by controlling UV-induced morphogenic responses.
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Affiliation(s)
- Kathleen Hectors
- Laboratory of Molecular Physiology and Biotechnology, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
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149
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Henrichs S, Wang B, Fukao Y, Zhu J, Charrier L, Bailly A, Oehring SC, Linnert M, Weiwad M, Endler A, Nanni P, Pollmann S, Mancuso S, Schulz A, Geisler M. Regulation of ABCB1/PGP1-catalysed auxin transport by linker phosphorylation. EMBO J 2012; 31:2965-80. [PMID: 22549467 PMCID: PMC3395086 DOI: 10.1038/emboj.2012.120] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2011] [Accepted: 04/02/2012] [Indexed: 01/12/2023] Open
Abstract
Polar transport of the plant hormone auxin is controlled by PIN- and ABCB/PGP-efflux catalysts. PIN polarity is regulated by the AGC protein kinase, PINOID (PID), while ABCB activity was shown to be dependent on interaction with the FKBP42, TWISTED DWARF1 (TWD1). Using co-immunoprecipitation (co-IP) and shotgun LC-MS/MS analysis, we identified PID as a valid partner in the interaction with TWD1. In-vitro and yeast expression analyses indicated that PID specifically modulates ABCB1-mediated auxin efflux in an action that is dependent on its kinase activity and that is reverted by quercetin binding and thus inhibition of PID autophosphorylation. Triple ABCB1/PID/TWD1 co-transfection in tobacco revealed that PID enhances ABCB1-mediated auxin efflux but blocks ABCB1 in the presence of TWD1. Phospho-proteomic analyses identified S634 as a key residue of the regulatory ABCB1 linker and a very likely target of PID phosphorylation that determines both transporter drug binding and activity. In summary, we provide evidence that PID phosphorylation has a dual, counter-active impact on ABCB1 activity that is coordinated by TWD1-PID interaction.
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Affiliation(s)
- Sina Henrichs
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
| | - Bangjun Wang
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
- Department of Biology—Plant Biology, University of Fribourg, Fribourg, Switzerland
- Department of Plant Biology and Biotechnology, University of Copenhagen, Frederiksberg, Denmark
| | - Yoichiro Fukao
- Plant Global Educational Project, Graduate School of Biological Sciences, Nara Institute of Science and Technology, Ikoma, Japan
| | - Jinsheng Zhu
- Department of Biology—Plant Biology, University of Fribourg, Fribourg, Switzerland
| | - Laurence Charrier
- Department of Biology—Plant Biology, University of Fribourg, Fribourg, Switzerland
| | - Aurélien Bailly
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
- Department of Biology—Plant Biology, University of Fribourg, Fribourg, Switzerland
| | - Sophie C Oehring
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
| | - Miriam Linnert
- Signaltransduktion, Max-Planck-Forschungsstelle für Enzymologie der Proteinfaltung, Halle (Saale), Germany
| | - Matthias Weiwad
- Signaltransduktion, Max-Planck-Forschungsstelle für Enzymologie der Proteinfaltung, Halle (Saale), Germany
| | - Anne Endler
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
| | - Paolo Nanni
- Functional Genomics Center Zurich, UZH/ETH Zürich, Zürich, Switzerland
| | - Stephan Pollmann
- Ruhr-Universität Bochum, Lehrstuhl für Pflanzenphysiologie, Bochum, Germany
| | - Stefano Mancuso
- Department of Plant, Soil and Environmental Science, University of Florence, Sesto Fiorentino, Italy
| | - Alexander Schulz
- Department of Plant Biology and Biotechnology, University of Copenhagen, Frederiksberg, Denmark
| | - Markus Geisler
- Molecular Plant Physiology, Institute of Plant Biology, University of Zurich and Zurich-Basel Plant Science Center, Zurich, Switzerland
- Department of Biology—Plant Biology, University of Fribourg, Fribourg, Switzerland
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150
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Finet C, Jaillais Y. Auxology: when auxin meets plant evo-devo. Dev Biol 2012; 369:19-31. [PMID: 22687750 DOI: 10.1016/j.ydbio.2012.05.039] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2012] [Revised: 05/09/2012] [Accepted: 05/31/2012] [Indexed: 11/27/2022]
Abstract
Auxin is implicated throughout plant growth and development. Although the effects of this plant hormone have been recognized for more than a century, it is only in the past two decades that light has been shed on the molecular mechanisms that regulate auxin homeostasis, signaling, transport, crosstalk with other hormonal pathways as well as its roles in plant development. These discoveries established a molecular framework to study the role of auxin in land plant evolution. Here, we review recent advances in auxin biology and their implications in both micro- and macro-evolution of plant morphology. By analogy to the term 'hoxology', which refers to the critical role of HOX genes in metazoan evolution, we propose to introduce the term 'auxology' to take into account the crucial role of auxin in plant evo-devo.
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Affiliation(s)
- Cédric Finet
- Howard Hughes Medical Institute and Laboratory of Molecular Biology, University of Wisconsin, Madison, WI 53706, USA.
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