G-protein-coupled α2A-adrenoreceptor agonists differentially alter citrus leaf and fruit abscission by affecting expression of ACC synthase and ACC oxidase
Identifieur interne : 000675 ( Istex/Curation ); précédent : 000674; suivant : 000676G-protein-coupled α2A-adrenoreceptor agonists differentially alter citrus leaf and fruit abscission by affecting expression of ACC synthase and ACC oxidase
Auteurs : Rongcai Yuan [États-Unis] ; Zhencai Wu [États-Unis] ; Igor A. Kostenyuk [États-Unis] ; Jacqueline K. Burns [États-Unis]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2005-07.
English descriptors
Abstract
Temporal and spatial expression patterns of genes encoding 1-aminocyclopropane-1-carboxylate (ACC) synthase (ACS1 and ACS2) and ACC oxidase (ACO), ACC concentration, and ethylene production in leaves and fruit of ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) were examined in relation to differential abscission after treatment with 2-chloroethylphosphonic acid (ethephon) alone or in combination with guanfacine or clonidine, two G-protein-coupled α2A-adrenoreceptor selective agonists. Guanfacine and clonidine markedly reduced ethephon-enhanced leaf abscission, but had little effect on ethephon-enhanced fruit loosening. Ethephon-enhanced fruit and leaf ethylene production, and ACC concentration in fruit abscission zones, fruit peel, leaf abscission zones, and leaf blades were decreased by guanfacine. Guanfacine reduced ethephon-enhanced expression of ACS1 and ACO genes in leaf abscission zones and blades, but to a lesser extent in fruit abscission zones. The expression pattern of the ACS2 gene, however, was not associated with abscission. The results demonstrate that differential expression of ACS1 and ACO genes is associated with reduction of ethephon-enhanced leaf abscission by guanfacine, and suggest a link between G-protein-related signalling and abscission.
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DOI: 10.1093/jxb/eri176
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Bot.</title><idno type="ISSN">0022-0957</idno><idno type="eISSN">1460-2431</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2005-07">2005-07</date><biblScope unit="volume">56</biblScope><biblScope unit="issue">417</biblScope><biblScope unit="page" from="1867">1867</biblScope><biblScope unit="page" to="1875">1875</biblScope></imprint><idno type="ISSN">0022-0957</idno></series><idno type="istex">90EBE53176DB275341D300FB66179BF62ED79AED</idno><idno type="DOI">10.1093/jxb/eri176</idno><idno type="local">eri176</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-0957</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>1-Aminocyclopropane-1-carboxylic acid</term><term>clonidine</term><term>ethephon</term><term>ethylene</term><term>guanfacine</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Temporal and spatial expression patterns of genes encoding 1-aminocyclopropane-1-carboxylate (ACC) synthase (ACS1 and ACS2) and ACC oxidase (ACO), ACC concentration, and ethylene production in leaves and fruit of ‘Valencia’ orange (Citrus sinensis [L.] Osbeck) were examined in relation to differential abscission after treatment with 2-chloroethylphosphonic acid (ethephon) alone or in combination with guanfacine or clonidine, two G-protein-coupled α2A-adrenoreceptor selective agonists. Guanfacine and clonidine markedly reduced ethephon-enhanced leaf abscission, but had little effect on ethephon-enhanced fruit loosening. Ethephon-enhanced fruit and leaf ethylene production, and ACC concentration in fruit abscission zones, fruit peel, leaf abscission zones, and leaf blades were decreased by guanfacine. Guanfacine reduced ethephon-enhanced expression of ACS1 and ACO genes in leaf abscission zones and blades, but to a lesser extent in fruit abscission zones. The expression pattern of the ACS2 gene, however, was not associated with abscission. The results demonstrate that differential expression of ACS1 and ACO genes is associated with reduction of ethephon-enhanced leaf abscission by guanfacine, and suggest a link between G-protein-related signalling and abscission.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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