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Berlin Brandenburg

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  • 1
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 22 February 2011, Vol.108(8), pp.3436-41
    Description: In living organisms sugars not only provide energy and carbon skeletons but also act as evolutionarily conserved signaling molecules. The three major soluble sugars in plants are sucrose, glucose, and fructose. Information on plant glucose and sucrose signaling is available, but to date no fructose-specific signaling pathway has been reported. In this study, sugar repression of seedling development was used to study fructose sensitivity in the Landsberg erecta (Ler)/Cape Verde Islands (Cvi) recombinant inbred line population, and eight fructose-sensing quantitative trait loci (QTLs) (FSQ1-8) were mapped. Among them, FSQ6 was confirmed to be a fructose-specific QTL by analyzing near-isogenic lines in which Cvi genomic fragments were introgressed in the Ler background. These results indicate the existence of a fructose-specific signaling pathway in Arabidopsis. Further analysis demonstrated that the FSQ6-associated fructose-signaling pathway functions independently of the hexokinase1 (HXK1) glucose sensor. Remarkably, fructose-specific FSQ6 downstream signaling interacts with abscisic acid (ABA)- and ethylene-signaling pathways, similar to HXK1-dependent glucose signaling. The Cvi allele of FSQ6 acts as a suppressor of fructose signaling. The FSQ6 gene was identified using map-based cloning approach, and FSQ6 was shown to encode the transcription factor gene Arabidopsis NAC (petunia No apical meristem and Arabidopsis transcription activation factor 1, 2 and Cup-shaped cotyledon 2) domain containing protein 89 (ANAC089). The Cvi allele of FSQ6/ANAC089 is a gain-of-function allele caused by a premature stop in the third exon of the gene. The truncated Cvi FSQ6/ANAC089 protein lacks a membrane association domain that is present in ANAC089 proteins from other Arabidopsis accessions. As a result, Cvi FSQ6/ANAC089 is constitutively active as a transcription factor in the nucleus.
    Keywords: Signal Transduction ; Arabidopsis -- Metabolism ; Arabidopsis Proteins -- Physiology ; Fructose -- Metabolism ; Transcription Factors -- Physiology
    ISSN: 00278424
    E-ISSN: 1091-6490
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  • 2
    In: Journal Of Experimental Botany, 2014, Vol. 65(3), pp.799-807
    Description: Sugars as signalling molecules are key regulators that control the generation and deployment of resources for plant growth and development, including biomass accumulation. Here, major sugar responsive signalling systems are reviewed, with emphasis on trehalose 6-phosphate, TOR kinase, SnRK1 and the C/S1 bZIP network. Sugars have a central regulatory function in steering plant growth. This review focuses on information presented in the past 2 years on key players in sugar-mediated plant growth regulation, with emphasis on trehalose 6-phosphate, target of rapamycin kinase, and Snf1-related kinase 1 regulatory systems. The regulation of protein synthesis by sugars is fundamental to plant growth control, and recent advances in our understanding of the regulation of translation by sugars will be discussed.
    Keywords: Energy Stress ; Plant Growth ; Protein Translation ; Ribosome ; S1 - Group Bzip ; Snrk1 ; Sugar Signalling ; Tor Kinase ; Trehalose 6 - Phosphate.
    ISSN: 0022-0957
    E-ISSN: 1460-2431
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  • 3
    Language: English
    In: Phytochemistry, 2010, Vol.71(14), pp.1610-1614
    Description: Sucrose as a metabolite and as a signaling molecule has impact on both plant development and physiology. Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of sucrose affects plant growth, development and physiology. Altered sucrose levels changes the quantity of sucrose derived metabolites and sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of sucrose metabolism and sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth.
    Keywords: Sucrose ; Signaling ; Metabolism ; Arabidopsis ; Carbon Transport ; Gene Expression ; Botany
    ISSN: 0031-9422
    E-ISSN: 1873-3700
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  • 4
    In: New Phytologist, October 2014, Vol.204(2), pp.368-379
    Description: Selected soil‐borne rhizobacteria can trigger an induced systemic resistance (ISR) that is effective against a broad spectrum of pathogens. In Arabidopsis thaliana, the root‐specific transcription factor MYB72 is required for the onset of ISR, but is also associated with plant survival under conditions of iron deficiency. Here, we investigated the role of MYB72 in both processes. To identify MYB72 target genes, we analyzed the root transcriptomes of wild‐type Col‐0, mutant myb72 and complemented 35S:FLAG‐MYB72/myb72 plants in response to ISR‐inducing Pseudomonas fluorescens WCS417. Five WCS417‐inducible genes were misregulated in myb72 and complemented in 35S:FLAG‐MYB72/myb72. Amongst these, we uncovered β‐glucosidase BGLU42 as a novel component of the ISR signaling pathway. Overexpression of BGLU42 resulted in constitutive disease resistance, whereas the bglu42 mutant was defective in ISR. Furthermore, we found 195 genes to be constitutively upregulated in MYB72‐overexpressing roots in the absence of WCS417. Many of these encode enzymes involved in the production of iron‐mobilizing phenolic metabolites under conditions of iron deficiency. We provide evidence that BGLU42 is required for their release into the rhizosphere. Together, this work highlights a thus far unidentified link between the ability of beneficial rhizobacteria to stimulate systemic immunity and mechanisms induced by iron deficiency in host plants.
    Keywords: Beneficial Microbes ; Glucoside Hydrolase ; Induced Systemic Resistance ; Iron Deficiency Response ; Transcription Factors ; Pseudomonas Fluorescens ; Rhizosphere
    ISSN: 0028-646X
    E-ISSN: 1469-8137
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  • 5
    Language: English
    In: New Phytologist, 2014, Vol.204(2), pp.368-379
    Description: Selected soil-borne rhizobacteria can trigger an induced systemic resistance (ISR) that is effective against a broad spectrum of pathogens. In Arabidopsis thaliana, the root-specific transcription factor MYB72 is required for the onset of ISR, but is...
    Keywords: Natural Sciences ; Biological Sciences ; Naturvetenskap ; Biologiska Vetenskaper ; Beneficial Microbes ; Glucoside Hydrolase ; Induced Systemic Resistance (Isr) ; Iron Deficiency Response ; Myb Transcription Factors ; Pseudomonas Fluorescens ; Rhizosphere
    ISSN: 0028-646X
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  • 6
    Language: English
    In: Phytochemistry, 2010, Vol.71, pp.1610-1614
    Description: Sucrose is a molecule that is synthesized only by oxygenic photosynthetic organisms. In plants, sucrose is synthesized in source tissues and then can be transported to sink tissues, where it is utilized or stored. Interestingly, sucrose is both a metabolite and a signaling molecule. Manipulating the rate of the synthesis, transport or degradation of sucrose affects plant growth, development and physiology. Altered sucrose levels changes the quantity of sucrose derived metabolites and sucrose-specific signaling. In this paper, these changes are summarized. Better understanding of sucrose metabolism and sucrose sensing systems in plants will lead to opportunities to adapt plant metabolism and growth. ; Includes references ; p. 1610-1614.
    ISSN: 0031-9422
    Source: AGRIS (Food and Agriculture Organization of the United Nations)
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  • 7
    In: New Phytologist, April 2017, Vol.214(1), pp.233-244
    Description: This work investigates the extent of translational regulation during seed germination. The polysome occupancy of each gene is determined by genome‐wide profiling of total mRNA and polysome‐associated mRNA. This reveals extensive translational regulation during Arabidopsis thaliana seed germination. The polysome occupancy of thousands of individual mRNAs changes to a large extent during the germination process. Intriguingly, these changes are restricted to two temporal phases (shifts) during germination, seed hydration and germination. Sequence features, such as upstream open reading frame number, transcript length, mRNA stability, secondary structures, and the presence and location of specific motifs correlated with this translational regulation. These features differed significantly between the two shifts, indicating that independent mechanisms regulate translation during seed germination. This study reveals substantial translational dynamics during seed germination and identifies development‐dependent sequence features and cis elements that correlate with the translation control, uncovering a novel and important layer of gene regulation during seed germination.
    Keywords: Arabidopsis ; Germination ; Imbibition ; Polysomal Profiling ; Ribosome ; Rna Structure ; Seedling Establishment ; Translatomics
    ISSN: 0028-646X
    E-ISSN: 1469-8137
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  • 8
    Language: English
    In: The Plant Journal, 2015, Vol. 84(2), pp. 309-322
    Description: In Arabidopsis roots, the transcription factor MYB72 plays a dual role in the onset of rhizobacteria-induced systemic resistance (ISR) and plant survival under conditions of limited iron availability. Previously, it was shown that MYB72 coordinates the expression of a gene module that promotes synthesis and excretion of iron-mobilizing phenolic compounds in the rhizosphere, a process that is involved in both iron acquisition and ISR signaling. Here, we show that volatile organic compounds (VOCs) from ISR-inducing Pseudomonas bacteria are important elicitors of MYB72. In response to VOC treatment, MYB72 is co-expressed with the iron uptake-related genes FERRIC REDUCTION OXIDASE2 (FRO2) and IRON-REGULATED TRANSPORTER1 (IRT1) in a manner that is dependent on FER-LIKE IRON DEFICIENCY TRANSCRIPTION FACTOR (FIT), indicating that MYB72 is an intrinsic part of the plant's iron-acquisition response that is typically activated upon iron starvation. However, VOC-induced MYB72 expression is activated independently of iron availability in the root vicinity. Moreover, rhizobacterial VOC-mediated induction of MYB72 requires photosynthesis-related signals, while iron deficiency in the rhizosphere activates MYB72 in the absence of shoot-derived signals. Together, these results show that the ISR- and iron acquisition-related transcription factor MYB72 in Arabidopsis roots is activated by rhizobacterial volatiles and photosynthesis-related signals, and enhances the iron-acquisition capacity of roots independently of the iron availability in the rhizosphere. This work highlights the role of MYB72 in plant processes by which root microbiota simultaneously stimulate systemic immunity and activate the iron-uptake machinery in their host plants. Significance Statement Plant roots intimately interact with plant growth-promoting rhizobacteria that prime the plant immune system and aid in iron uptake two functions facilitated by the root-specific transcription factor MYB72. Here we show how MYB72 and iron uptake responses are systemically activated by photosynthesis-related signals and volatiles produced by plant growth-promoting rhizobacteria, highlighting the important role of beneficial root microbiota in supporting plant growth and health.
    Keywords: Induced Resistance ; Iron Homeostasis ; Myb Transcription Factor ; Volatile Organic Compounds ; Abidopsis Thaliana ; Plant Growth-Promoting Rhizobacteria ; Natural Sciences ; Biological Sciences ; Botany ; Naturvetenskap ; Biologiska Vetenskaper ; Botanik
    ISSN: 0960-7412
    E-ISSN: 1365313X
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  • 9
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 02 March 2010, Vol.107(9), pp.4264-9
    Description: Timing of germination is presumably under strong natural selection as it determines the environmental conditions in which a plant germinates and initiates its postembryonic life cycle. To investigate how seed dormancy is controlled, quantitative trait loci (QTL) analyses has been performed in six Arabidopsis thaliana recombinant inbred line populations by analyzing them simultaneously using a mixed model QTL approach. The recombinant inbred line populations were derived from crosses between the reference accession Landsberg erecta (Ler) and accessions from different world regions. In total, 11 delay of germination (DOG) QTL have been identified, and nine of them have been confirmed by near isogenic lines (NILs). The absence of strong epistatic interactions between the different DOG loci suggests that they affect dormancy mainly by distinct genetic pathways. This was confirmed by analyzing the transcriptome of freshly harvested dry seeds of five different DOG NILs. All five DOG NILs showed discernible and different expression patterns compared with the expression of their genetic background Ler. The genes identified in the different DOG NILs represent largely different gene ontology profiles. It is proposed that natural variation for seed dormancy in Arabidopsis is mainly controlled by different additive genetic and molecular pathways rather than epistatic interactions, indicating the involvement of several independent pathways.
    Keywords: Genetic Variation ; Seeds ; Arabidopsis -- Embryology
    ISSN: 00278424
    E-ISSN: 1091-6490
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  • 10
    Language: English
    In: Proceedings of the National Academy of Sciences of the United States of America, 2010, Vol.107(9), pp.4264-4269
    Description: Timing of germination is presumably under strong natural selection as it determines the environmental conditions in which a plant germinates and initiates its postembryonic life cycle. To investigate how seed dormancy is controlled, quantitative trait loci (QTL) analyses has been performed in six Arabidopsis thaliana recombinant inbred line populations by analyzing them simultaneously using a mixed model QTL approach. The recombinant inbred line populations were derived from crosses between the reference accession Landsberg erecta (Ler) and accessions from different world regions. In total, 11 delay of germination (DOG) QTL have been identified, and nine of them have been confirmed by near isogenic lines (NILs). The absence of strong epistatic interactions between the different DOG loci suggests that they affect dormancy mainly by distinct genetic pathways. This was confirmed by analyzing the transcriptome of freshly harvested dry seeds of five different DOG NILs. All five DOG NILs showed discernible and different expression patterns compared with the expression of their genetic background Ler. The genes identified in the different DOG NILs represent largely different gene ontology profiles. It is proposed that natural variation for seed dormancy in Arabidopsis is mainly controlled by different additive genetic and molecular pathways rather than epistatic interactions, indicating the involvement of several independent pathways. ; Includes references ; p. 4264-4269.
    Keywords: Messenger Rna ; Arabidopsis Thaliana ; Quantitative Trait Loci ; Transcriptome ; Plant Genetics ; Inbred Lines ; Seed Dormancy ; Recombinant Inbred Lines ; Dog Loci
    ISSN: 0027-8424
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