Spermidine and related‐metabolic inhibitors modulate sugar and amino acid levels in Vitis vinifera L.: possible relationships with initial fruitlet abscission
Identifieur interne : 002A74 ( Main/Exploration ); précédent : 002A73; suivant : 002A75Spermidine and related‐metabolic inhibitors modulate sugar and amino acid levels in Vitis vinifera L.: possible relationships with initial fruitlet abscission
Auteurs : Aziz Aziz [France]Source :
- Journal of Experimental Botany [ 0022-0957 ] ; 2003-01-02.
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Abstract
The relationships between free polyamines (PAs), sugar and amino acid status were investigated in cuttings from two cultivars of Vitis vinifera L., Pinot noir (PN), a low abscising cultivar and Merlot (MRT), a high abscising one. In both cultivars free PAs decreased in inflorescences, but more drastically in MRT plants. Upon anthesis, this was associated with a decreased sugar content, especially sucrose, and an increase in total free amino acids. Thereafter, sucrose and amino acids showed opposite trends. In addition, darkening the PN plants at full flowering resulted in a dramatic decrease of PAs and sugars in inflorescences, but an increase in amino acid content, followed by high abscission. The concept that initial fruitlet abscission might be regulated by free PAs through changes in primary metabolites was hypothesized. Hence, the application of exogenous spermidine (Spd), but not putrescine (Put), prior to flowering markedly inhibits abscission. The Spd treatment also increased soluble sugar content but reduced amino acids in both leaves and inflorescences, while Put had no significant effect. By contrast, cyclohexylamine and β‐hydroxyethylhydrazine, as potent inhibitors of Spd synthase and PA‐oxidases, respectively, exerted inverse effects on sugar, amino acid and abscission levels. Sucrose and free proline seemed to be highly sensitive to these treatments. This study suggests that Spd could regulate fruitlet abscission in grapevine by modulating, in a reverse way, the levels of sugars and amino acids in inflorescences.
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DOI: 10.1093/jxb/erg029
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Exp. Bot.</title><idno type="ISSN">0022-0957</idno><idno type="eISSN">1460-2431</idno><imprint><publisher>Oxford University Press</publisher><date type="published" when="2003-01-02">2003-01-02</date><biblScope unit="volume">54</biblScope><biblScope unit="issue">381</biblScope><biblScope unit="page" from="355">355</biblScope><biblScope unit="page" to="363">363</biblScope></imprint><idno type="ISSN">0022-0957</idno></series><idno type="istex">F2C4F3E7CAEA9FB23D82BE1D3AFCBF756429DC05</idno><idno type="DOI">10.1093/jxb/erg029</idno><idno type="local">erg029</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-0957</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Key words: Abscission, amino acids, grapevine, polyamines, proline, spermidine, sucrose, sugars.</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The relationships between free polyamines (PAs), sugar and amino acid status were investigated in cuttings from two cultivars of Vitis vinifera L., Pinot noir (PN), a low abscising cultivar and Merlot (MRT), a high abscising one. In both cultivars free PAs decreased in inflorescences, but more drastically in MRT plants. Upon anthesis, this was associated with a decreased sugar content, especially sucrose, and an increase in total free amino acids. Thereafter, sucrose and amino acids showed opposite trends. In addition, darkening the PN plants at full flowering resulted in a dramatic decrease of PAs and sugars in inflorescences, but an increase in amino acid content, followed by high abscission. The concept that initial fruitlet abscission might be regulated by free PAs through changes in primary metabolites was hypothesized. Hence, the application of exogenous spermidine (Spd), but not putrescine (Put), prior to flowering markedly inhibits abscission. The Spd treatment also increased soluble sugar content but reduced amino acids in both leaves and inflorescences, while Put had no significant effect. By contrast, cyclohexylamine and β‐hydroxyethylhydrazine, as potent inhibitors of Spd synthase and PA‐oxidases, respectively, exerted inverse effects on sugar, amino acid and abscission levels. Sucrose and free proline seemed to be highly sensitive to these treatments. This study suggests that Spd could regulate fruitlet abscission in grapevine by modulating, in a reverse way, the levels of sugars and amino acids in inflorescences.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Champagne-Ardenne</li><li>Grand Est</li></region><settlement><li>REIMS</li></settlement></list><tree><country name="France"><region name="Grand Est"><name sortKey="Aziz, Aziz" sort="Aziz, Aziz" uniqKey="Aziz A" first="Aziz" last="Aziz">Aziz Aziz</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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