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The seasonal activity and the effect of mechanical bending and wounding on the PtCOMT promoter in Betula pendula Roth.

Identifieur interne : 003A50 ( Main/Exploration ); précédent : 003A49; suivant : 003A51

The seasonal activity and the effect of mechanical bending and wounding on the PtCOMT promoter in Betula pendula Roth.

Auteurs : Heidi Tiimonen [Finlande] ; Hely H Ggman ; Chung-Jui Tsai ; Vincent Chiang ; Tuija Aronen

Source :

RBID : pubmed:17431633

Descripteurs français

English descriptors

Abstract

In this study, 900-bp (signed as p including nucleotides -1 to -886) and partly deleted (signed as dp including nucleotides -1 to -414) COMT (caffeate/5-hydroxyferulate O-methyltransferase) promoters from Populus tremuloides Michx. were fused to the GUS reporter gene, and the tissue-specific expression patterns of the promoters were determined in Betula pendula Roth along the growing season, and as a response to mechanical bending and wounding. The main activity of the PtCOMTp- and PtCOMTdp-promoters, determined by the histochemical GUS assay, was found in the developing xylem of stems during the 8th-13th week and in the developing xylem of roots in the 13th week of the growing season. The GUS expression patterns did not differ among the xylem cell types. The PtCOMT promoter-induced GUS expression observed in phloem fibres suggests a need for PtCOMT expression and thus syringyl (S) lignin synthesis in fibre lignification. However, the PtCOMTdp-promoter induced GUS expression in stem trichomes, which may contribute to the biosynthesis of phenylpropanoid pathway-derived compounds other than lignin. Finally, a strong GUS expression was induced by the PtCOMT promoters in response to mechanical stem bending but not to wounding. The lack of major differences between the PtCOMTp- and PtCOMTdp-promoters suggests that the deleted promoter sequence (including nucleotides -415 to -886) did not contain a significant regulatory element contributing to the GUS expression in young B. pendula trees.

DOI: 10.1007/s00299-007-0331-x
PubMed: 17431633


Affiliations:


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Le document en format XML

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<term>Betula (genetics)</term>
<term>Betula (metabolism)</term>
<term>Gene Expression Regulation, Plant (MeSH)</term>
<term>Plant Roots (genetics)</term>
<term>Plant Roots (metabolism)</term>
<term>Plant Stems (anatomy & histology)</term>
<term>Plant Stems (genetics)</term>
<term>Plant Stems (metabolism)</term>
<term>Plants, Genetically Modified (MeSH)</term>
<term>Promoter Regions, Genetic (genetics)</term>
<term>Seasons (MeSH)</term>
<term>Stress, Mechanical (MeSH)</term>
</keywords>
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<term>Betula (génétique)</term>
<term>Betula (métabolisme)</term>
<term>Contrainte mécanique (MeSH)</term>
<term>Racines de plante (génétique)</term>
<term>Racines de plante (métabolisme)</term>
<term>Régions promotrices (génétique) (génétique)</term>
<term>Régulation de l'expression des gènes végétaux (MeSH)</term>
<term>Saisons (MeSH)</term>
<term>Tiges de plante (anatomie et histologie)</term>
<term>Tiges de plante (génétique)</term>
<term>Tiges de plante (métabolisme)</term>
<term>Végétaux génétiquement modifiés (MeSH)</term>
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<term>Tiges de plante</term>
</keywords>
<keywords scheme="MESH" qualifier="anatomy & histology" xml:lang="en">
<term>Plant Stems</term>
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<keywords scheme="MESH" qualifier="genetics" xml:lang="en">
<term>Betula</term>
<term>Plant Roots</term>
<term>Plant Stems</term>
<term>Promoter Regions, Genetic</term>
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<term>Racines de plante</term>
<term>Régions promotrices (génétique)</term>
<term>Tiges de plante</term>
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<term>Plant Roots</term>
<term>Plant Stems</term>
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<term>Tiges de plante</term>
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<term>Stress, Mechanical</term>
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<term>Régulation de l'expression des gènes végétaux</term>
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<front>
<div type="abstract" xml:lang="en">In this study, 900-bp (signed as p including nucleotides -1 to -886) and partly deleted (signed as dp including nucleotides -1 to -414) COMT (caffeate/5-hydroxyferulate O-methyltransferase) promoters from Populus tremuloides Michx. were fused to the GUS reporter gene, and the tissue-specific expression patterns of the promoters were determined in Betula pendula Roth along the growing season, and as a response to mechanical bending and wounding. The main activity of the PtCOMTp- and PtCOMTdp-promoters, determined by the histochemical GUS assay, was found in the developing xylem of stems during the 8th-13th week and in the developing xylem of roots in the 13th week of the growing season. The GUS expression patterns did not differ among the xylem cell types. The PtCOMT promoter-induced GUS expression observed in phloem fibres suggests a need for PtCOMT expression and thus syringyl (S) lignin synthesis in fibre lignification. However, the PtCOMTdp-promoter induced GUS expression in stem trichomes, which may contribute to the biosynthesis of phenylpropanoid pathway-derived compounds other than lignin. Finally, a strong GUS expression was induced by the PtCOMT promoters in response to mechanical stem bending but not to wounding. The lack of major differences between the PtCOMTp- and PtCOMTdp-promoters suggests that the deleted promoter sequence (including nucleotides -415 to -886) did not contain a significant regulatory element contributing to the GUS expression in young B. pendula trees.</div>
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<AbstractText>In this study, 900-bp (signed as p including nucleotides -1 to -886) and partly deleted (signed as dp including nucleotides -1 to -414) COMT (caffeate/5-hydroxyferulate O-methyltransferase) promoters from Populus tremuloides Michx. were fused to the GUS reporter gene, and the tissue-specific expression patterns of the promoters were determined in Betula pendula Roth along the growing season, and as a response to mechanical bending and wounding. The main activity of the PtCOMTp- and PtCOMTdp-promoters, determined by the histochemical GUS assay, was found in the developing xylem of stems during the 8th-13th week and in the developing xylem of roots in the 13th week of the growing season. The GUS expression patterns did not differ among the xylem cell types. The PtCOMT promoter-induced GUS expression observed in phloem fibres suggests a need for PtCOMT expression and thus syringyl (S) lignin synthesis in fibre lignification. However, the PtCOMTdp-promoter induced GUS expression in stem trichomes, which may contribute to the biosynthesis of phenylpropanoid pathway-derived compounds other than lignin. Finally, a strong GUS expression was induced by the PtCOMT promoters in response to mechanical stem bending but not to wounding. The lack of major differences between the PtCOMTp- and PtCOMTdp-promoters suggests that the deleted promoter sequence (including nucleotides -415 to -886) did not contain a significant regulatory element contributing to the GUS expression in young B. pendula trees.</AbstractText>
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