PoplarV1, Main, Exploration, bibRecord, 004488

Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood.

Identifieur interne : 004488 ( Main/Exploration ); précédent : 004487; suivant : 004489

Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood.

Auteurs : Sara Andersson-Gunner S [Suède] ; Jenny M. Hellgren ; Simon Björklund ; Sharon Regan ; Thomas Moritz ; Björn Sundberg

Source :

The Plant journal : for cell and molecular biology [ 0960-7412 ] ; 2003.

RBID : pubmed:12713540

Descripteurs français

English descriptors

KwdEn :
- Amino Acid Oxidoreductases (genetics), Amino Acid Oxidoreductases (metabolism), Amino Acid Sequence (MeSH), Ethylenes (biosynthesis), Gene Expression Regulation, Enzymologic (MeSH), Gene Expression Regulation, Plant (MeSH), Gravitation (MeSH), Molecular Sequence Data (MeSH), Phylogeny (MeSH), Plant Proteins (genetics), Plant Proteins (metabolism), Plant Stems (enzymology), Plant Stems (genetics), Plant Stems (physiology), Populus (enzymology), Populus (genetics), Populus (physiology), Sequence Homology, Amino Acid (MeSH), Tensile Strength (MeSH).
MESH :
- chemical , biosynthesis : Ethylenes.
- chemical , genetics : Amino Acid Oxidoreductases, Plant Proteins.
- chemical , metabolism : Amino Acid Oxidoreductases, Plant Proteins.
- enzymology : Plant Stems, Populus.
- genetics : Plant Stems, Populus.
- physiology : Plant Stems, Populus.
- Amino Acid Sequence, Gene Expression Regulation, Enzymologic, Gene Expression Regulation, Plant, Gravitation, Molecular Sequence Data, Phylogeny, Sequence Homology, Amino Acid, Tensile Strength.

Abstract

Ethylene is produced in wood-forming tissues, and when applied exogenously, it has been shown to cause profound effects on the pattern and rate of wood development. However, the molecular regulation of ethylene biosynthesis during wood formation is poorly understood. We have characterised an abundant 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase gene (PttACO1) in the wood-forming tissues of Populus tremula (L.) x P. tremuloides (Michx). PttACO1 is primarily expressed in developing secondary xylem, and is specifically upregulated during secondary wall formation. Nevertheless, according to GC-MS analysis combined with tangential cryosectioning, the distribution of ACC was found to be fairly uniform across the cambial-region tissues. Gravitational stimulation, which causes tension wood to form on the upper side of the stem, resulted in a strong induction of PttACO1 expression and ACC oxidase activity in the tension wood-forming tissues. The ACC levels increased in parallel to the PttACO1 expression. However, the increase on the upper (tension wood) side was only minor, whereas large amounts of both ACC and its hydrolysable conjugates accumulated on the lower (opposite) side of the stem. This suggests that the relatively low level of ACC on the tension wood side is a result of its conversion to ethylene by the highly upregulated PttACO1, and the concurrent accumulation of ACC on the opposite side of the wood is because of the low PttACO1 levels. We conclude that PttACO1 and ACC oxidase activity, but not ACC availability, are important in the control of the asymmetric ethylene production within the poplar stem when tension wood is induced by gravitational stimulation.

DOI: 10.1046/j.1365-313x.2003.01727.x
PubMed: 12713540

Affiliations:

Suède

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Le document en format XML

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<term>Amino Acid Oxidoreductases (metabolism)</term>
<term>Amino Acid Sequence (MeSH)</term>
<term>Ethylenes (biosynthesis)</term>
<term>Gene Expression Regulation, Enzymologic (MeSH)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Gravitation (MeSH)</term>
<term>Molecular Sequence Data (MeSH)</term>
<term>Phylogeny (MeSH)</term>
<term>Plant Proteins (genetics)</term>
<term>Plant Proteins (metabolism)</term>
<term>Plant Stems (enzymology)</term>
<term>Plant Stems (genetics)</term>
<term>Plant Stems (physiology)</term>
<term>Populus (enzymology)</term>
<term>Populus (genetics)</term>
<term>Populus (physiology)</term>
<term>Sequence Homology, Amino Acid (MeSH)</term>
<term>Tensile Strength (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr"><term>Amino-acid oxidoreductases (génétique)</term>
<term>Amino-acid oxidoreductases (métabolisme)</term>
<term>Données de séquences moléculaires (MeSH)</term>
<term>Gravitation (MeSH)</term>
<term>Phylogenèse (MeSH)</term>
<term>Populus (enzymologie)</term>
<term>Populus (génétique)</term>
<term>Populus (physiologie)</term>
<term>Protéines végétales (génétique)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Régulation de l'expression des gènes codant pour des enzymes (MeSH)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Résistance à la traction (MeSH)</term>
<term>Similitude de séquences d'acides aminés (MeSH)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Tiges de plante (enzymologie)</term>
<term>Tiges de plante (génétique)</term>
<term>Tiges de plante (physiologie)</term>
<term>Éthylènes (biosynthèse)</term>
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<keywords scheme="MESH" type="chemical" qualifier="biosynthesis" xml:lang="en"><term>Ethylenes</term>
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<term>Plant Proteins</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Amino Acid Oxidoreductases</term>
<term>Plant Proteins</term>
</keywords>
<keywords scheme="MESH" qualifier="biosynthèse" xml:lang="fr"><term>Éthylènes</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr"><term>Populus</term>
<term>Tiges de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Plant Stems</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="genetics" xml:lang="en"><term>Plant Stems</term>
<term>Populus</term>
</keywords>
<keywords scheme="MESH" qualifier="génétique" xml:lang="fr"><term>Amino-acid oxidoreductases</term>
<term>Populus</term>
<term>Protéines végétales</term>
<term>Tiges de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="métabolisme" xml:lang="fr"><term>Amino-acid oxidoreductases</term>
<term>Protéines végétales</term>
</keywords>
<keywords scheme="MESH" qualifier="physiologie" xml:lang="fr"><term>Populus</term>
<term>Tiges de plante</term>
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<keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Plant Stems</term>
<term>Populus</term>
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<term>Gene Expression Regulation, Enzymologic</term>
<term>Gene Expression Regulation, Plant</term>
<term>Gravitation</term>
<term>Molecular Sequence Data</term>
<term>Phylogeny</term>
<term>Sequence Homology, Amino Acid</term>
<term>Tensile Strength</term>
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<term>Gravitation</term>
<term>Phylogenèse</term>
<term>Régulation de l'expression des gènes codant pour des enzymes</term>
<term>Régulation de l'expression des gènes végétaux</term>
<term>Résistance à la traction</term>
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<front><div type="abstract" xml:lang="en">Ethylene is produced in wood-forming tissues, and when applied exogenously, it has been shown to cause profound effects on the pattern and rate of wood development. However, the molecular regulation of ethylene biosynthesis during wood formation is poorly understood. We have characterised an abundant 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase gene (PttACO1) in the wood-forming tissues of Populus tremula (L.) x P. tremuloides (Michx). PttACO1 is primarily expressed in developing secondary xylem, and is specifically upregulated during secondary wall formation. Nevertheless, according to GC-MS analysis combined with tangential cryosectioning, the distribution of ACC was found to be fairly uniform across the cambial-region tissues. Gravitational stimulation, which causes tension wood to form on the upper side of the stem, resulted in a strong induction of PttACO1 expression and ACC oxidase activity in the tension wood-forming tissues. The ACC levels increased in parallel to the PttACO1 expression. However, the increase on the upper (tension wood) side was only minor, whereas large amounts of both ACC and its hydrolysable conjugates accumulated on the lower (opposite) side of the stem. This suggests that the relatively low level of ACC on the tension wood side is a result of its conversion to ethylene by the highly upregulated PttACO1, and the concurrent accumulation of ACC on the opposite side of the wood is because of the low PttACO1 levels. We conclude that PttACO1 and ACC oxidase activity, but not ACC availability, are important in the control of the asymmetric ethylene production within the poplar stem when tension wood is induced by gravitational stimulation.</div>
</front>
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<DateCompleted><Year>2003</Year>
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<Title>The Plant journal : for cell and molecular biology</Title>
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<ArticleTitle>Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood.</ArticleTitle>
<Pagination><MedlinePgn>339-49</MedlinePgn>
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<Abstract><AbstractText>Ethylene is produced in wood-forming tissues, and when applied exogenously, it has been shown to cause profound effects on the pattern and rate of wood development. However, the molecular regulation of ethylene biosynthesis during wood formation is poorly understood. We have characterised an abundant 1-aminocyclopropane-1-carboxylic acid (ACC) oxidase gene (PttACO1) in the wood-forming tissues of Populus tremula (L.) x P. tremuloides (Michx). PttACO1 is primarily expressed in developing secondary xylem, and is specifically upregulated during secondary wall formation. Nevertheless, according to GC-MS analysis combined with tangential cryosectioning, the distribution of ACC was found to be fairly uniform across the cambial-region tissues. Gravitational stimulation, which causes tension wood to form on the upper side of the stem, resulted in a strong induction of PttACO1 expression and ACC oxidase activity in the tension wood-forming tissues. The ACC levels increased in parallel to the PttACO1 expression. However, the increase on the upper (tension wood) side was only minor, whereas large amounts of both ACC and its hydrolysable conjugates accumulated on the lower (opposite) side of the stem. This suggests that the relatively low level of ACC on the tension wood side is a result of its conversion to ethylene by the highly upregulated PttACO1, and the concurrent accumulation of ACC on the opposite side of the wood is because of the low PttACO1 levels. We conclude that PttACO1 and ACC oxidase activity, but not ACC availability, are important in the control of the asymmetric ethylene production within the poplar stem when tension wood is induced by gravitational stimulation.</AbstractText>
</Abstract>
<AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Andersson-Gunnerås</LastName>
<ForeName>Sara</ForeName>
<Initials>S</Initials>
<AffiliationInfo><Affiliation>Umeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, Sweden.</Affiliation>
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<Author ValidYN="Y"><LastName>Hellgren</LastName>
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<Author ValidYN="Y"><LastName>Björklund</LastName>
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<Author ValidYN="Y"><LastName>Moritz</LastName>
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<Initials>T</Initials>
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<ChemicalList><Chemical><RegistryNumber>0</RegistryNumber>
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<QualifierName UI="Q000502" MajorTopicYN="N">physiology</QualifierName>
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<MeshHeading><DescriptorName UI="D017386" MajorTopicYN="N">Sequence Homology, Amino Acid</DescriptorName>
</MeshHeading>
<MeshHeading><DescriptorName UI="D013718" MajorTopicYN="N">Tensile Strength</DescriptorName>
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<country name="Suède"><noRegion><name sortKey="Andersson Gunner S, Sara" sort="Andersson Gunner S, Sara" uniqKey="Andersson Gunner S S" first="Sara" last="Andersson-Gunner S">Sara Andersson-Gunner S</name>
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Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood.

Asymmetric expression of a poplar ACC oxidase controls ethylene production during gravitational induction of tension wood.

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Abstract

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