PoplarV1, Main, Exploration, bibRecord, 002D61

Phloem ultrastructure and pressure flow: Sieve-Element-Occlusion-Related agglomerations do not affect translocation.

Identifieur interne : 002D61 ( Main/Exploration ); précédent : 002D60; suivant : 002D62

Phloem ultrastructure and pressure flow: Sieve-Element-Occlusion-Related agglomerations do not affect translocation.

Auteurs : Daniel R. Froelich [États-Unis] ; Daniel L. Mullendore ; K Re H. Jensen ; Tim J. Ross-Elliott ; James A. Anstead ; Gary A. Thompson ; Hélène C. Pélissier ; Michael Knoblauch

Source :

The Plant cell [ 1532-298X ] ; 2011.

RBID : pubmed:22198148

Descripteurs français

English descriptors

KwdEn :
- Arabidopsis (genetics), Arabidopsis (growth & development), Arabidopsis (metabolism), Cloning, Molecular (MeSH), Fluorescent Dyes (metabolism), Freeze Substitution (MeSH), Genes, Plant (MeSH), Genetic Vectors (genetics), Genetic Vectors (metabolism), Image Processing, Computer-Assisted (MeSH), Microscopy, Electron, Transmission (MeSH), Mutagenesis, Insertional (MeSH), Phloem (growth & development), Phloem (metabolism), Phloem (ultrastructure), Plant Cells (metabolism), Plant Physiological Phenomena (MeSH), Plant Proteins (genetics), Plant Proteins (metabolism), Plant Roots (genetics), Plant Roots (growth & development), Plant Roots (metabolism), Plants, Genetically Modified (genetics), Plants, Genetically Modified (growth & development), Plants, Genetically Modified (metabolism), Populus (growth & development), Populus (metabolism), Pressure (MeSH), Protein Transport (MeSH), Tobacco (growth & development), Tobacco (metabolism), Transformation, Genetic (MeSH).
MESH :
- chemical , genetics : Plant Proteins.
- chemical , metabolism : Fluorescent Dyes, Plant Proteins.
- genetics : Arabidopsis, Genetic Vectors, Plant Roots, Plants, Genetically Modified.
- growth & development : Arabidopsis, Phloem, Plant Roots, Plants, Genetically Modified, Populus, Tobacco.
- metabolism : Arabidopsis, Genetic Vectors, Phloem, Plant Cells, Plant Roots, Plants, Genetically Modified, Populus, Tobacco.
- ultrastructure : Phloem.
- Cloning, Molecular, Freeze Substitution, Genes, Plant, Image Processing, Computer-Assisted, Microscopy, Electron, Transmission, Mutagenesis, Insertional, Plant Physiological Phenomena, Pressure, Protein Transport, Transformation, Genetic.

Abstract

Since the first ultrastructural investigations of sieve tubes in the early 1960s, their structure has been a matter of debate. Because sieve tube structure defines frictional interactions in the tube system, the presence of P protein obstructions shown in many transmission electron micrographs led to a discussion about the mode of phloem transport. At present, it is generally agreed that P protein agglomerations are preparation artifacts due to injury, the lumen of sieve tubes is free of obstructions, and phloem flow is driven by an osmotically generated pressure differential according to Münch's classical hypothesis. Here, we show that the phloem contains a distinctive network of protein filaments. Stable transgenic lines expressing Arabidopsis thaliana Sieve-Element-Occlusion-Related1 (SEOR1)-yellow fluorescent protein fusions show that At SEOR1 meshworks at the margins and clots in the lumen are a general feature of living sieve tubes. Live imaging of phloem flow and flow velocity measurements in individual tubes indicate that At SEOR1 agglomerations do not markedly affect or alter flow. A transmission electron microscopy preparation protocol has been generated showing sieve tube ultrastructure of unprecedented quality. A reconstruction of sieve tube ultrastructure served as basis for tube resistance calculations. The impact of agglomerations on phloem flow is discussed.

DOI: 10.1105/tpc.111.093179
PubMed: 22198148
PubMed Central: PMC3269875

Affiliations:

États-Unis

Links toward previous steps (curation, corpus...)

to stream Main, to step Corpus: 002B92
to stream Main, to step Curation: 002B92

Le document en format XML

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<term>Fluorescent Dyes (metabolism)</term>
<term>Freeze Substitution (MeSH)</term>
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<term>Genetic Vectors (genetics)</term>
<term>Genetic Vectors (metabolism)</term>
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<term>Phloem (ultrastructure)</term>
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<term>Plant Proteins (metabolism)</term>
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<term>Tobacco (growth & development)</term>
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<term>Arabidopsis (génétique)</term>
<term>Arabidopsis (métabolisme)</term>
<term>Cellules végétales (métabolisme)</term>
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<term>Colorants fluorescents (métabolisme)</term>
<term>Congélation-dissolution (MeSH)</term>
<term>Gènes de plante (MeSH)</term>
<term>Microscopie électronique à transmission (MeSH)</term>
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<term>Phloème (croissance et développement)</term>
<term>Phloème (métabolisme)</term>
<term>Phloème (ultrastructure)</term>
<term>Phénomènes physiologiques des plantes (MeSH)</term>
<term>Populus (croissance et développement)</term>
<term>Populus (métabolisme)</term>
<term>Pression (MeSH)</term>
<term>Protéines végétales (génétique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Racines de plante (croissance et développement)</term>
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<term>Tabac (croissance et développement)</term>
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<term>Transport des protéines (MeSH)</term>
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<term>Vecteurs génétiques (métabolisme)</term>
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<term>Racines de plante</term>
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<term>Végétaux génétiquement modifiés</term>
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<term>Plant Roots</term>
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<front><div type="abstract" xml:lang="en">Since the first ultrastructural investigations of sieve tubes in the early 1960s, their structure has been a matter of debate. Because sieve tube structure defines frictional interactions in the tube system, the presence of P protein obstructions shown in many transmission electron micrographs led to a discussion about the mode of phloem transport. At present, it is generally agreed that P protein agglomerations are preparation artifacts due to injury, the lumen of sieve tubes is free of obstructions, and phloem flow is driven by an osmotically generated pressure differential according to Münch's classical hypothesis. Here, we show that the phloem contains a distinctive network of protein filaments. Stable transgenic lines expressing Arabidopsis thaliana Sieve-Element-Occlusion-Related1 (SEOR1)-yellow fluorescent protein fusions show that At SEOR1 meshworks at the margins and clots in the lumen are a general feature of living sieve tubes. Live imaging of phloem flow and flow velocity measurements in individual tubes indicate that At SEOR1 agglomerations do not markedly affect or alter flow. A transmission electron microscopy preparation protocol has been generated showing sieve tube ultrastructure of unprecedented quality. A reconstruction of sieve tube ultrastructure served as basis for tube resistance calculations. The impact of agglomerations on phloem flow is discussed.</div>
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<Abstract><AbstractText>Since the first ultrastructural investigations of sieve tubes in the early 1960s, their structure has been a matter of debate. Because sieve tube structure defines frictional interactions in the tube system, the presence of P protein obstructions shown in many transmission electron micrographs led to a discussion about the mode of phloem transport. At present, it is generally agreed that P protein agglomerations are preparation artifacts due to injury, the lumen of sieve tubes is free of obstructions, and phloem flow is driven by an osmotically generated pressure differential according to Münch's classical hypothesis. Here, we show that the phloem contains a distinctive network of protein filaments. Stable transgenic lines expressing Arabidopsis thaliana Sieve-Element-Occlusion-Related1 (SEOR1)-yellow fluorescent protein fusions show that At SEOR1 meshworks at the margins and clots in the lumen are a general feature of living sieve tubes. Live imaging of phloem flow and flow velocity measurements in individual tubes indicate that At SEOR1 agglomerations do not markedly affect or alter flow. A transmission electron microscopy preparation protocol has been generated showing sieve tube ultrastructure of unprecedented quality. A reconstruction of sieve tube ultrastructure served as basis for tube resistance calculations. The impact of agglomerations on phloem flow is discussed.</AbstractText>
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Phloem ultrastructure and pressure flow: Sieve-Element-Occlusion-Related agglomerations do not affect translocation.

Phloem ultrastructure and pressure flow: Sieve-Element-Occlusion-Related agglomerations do not affect translocation.

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