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Cellular wall metabolism in citrus fruit pericarp and its relation to creasing fruit rate

Identifieur interne : 001F84 ( Main/Exploration ); précédent : 001F83; suivant : 001F85

Cellular wall metabolism in citrus fruit pericarp and its relation to creasing fruit rate

Auteurs : JUAN LI [République populaire de Chine] ; PANPAN ZHANG [République populaire de Chine] ; JIEZHONG CHEN [République populaire de Chine] ; QING YAO [République populaire de Chine] ; YUEMING JIANG [République populaire de Chine]

Source :

RBID : Pascal:09-0317676

Descripteurs français

English descriptors

Abstract

Citrus creasing results in serious economic loss in many citrus orchards. Based on the different incidence of creasing, two sweet orange cultivars 'Hong Jiang' (grafting chimaera of which flesh is mostly from Citrus reticulata Blanco and peel is from Citrus sinensis Osbeck in) and 'An Liu' (Citrus sinensis Osbeck) were used to investigate the creasing rate. The ultrastructure in cellular wall, cellular wall component, cellular wall degradation-related enzymes and expansin (Ct-Exp1) of sweet orange during fruit ripening in field were comparatively analyzed. 'Hong Jiang' sweet orange had a higher creasing rate than 'An Liu' during ripening. The activities of polygalacturonase, cellulase and pectinesterase in cellular wall of 'Hong Jiang' increased more markedly compared with 'An Liu'. The increases in the content of soluble pectin, ionically associated pectin, covalently bound pectin, hemicellulose and cellulose of 'Hong Jiang' were higher than those of'An Liu'. Furthermore, the enhanced degradation of the ultrastructure in the albedo cellular walls was observed in 'Hong Jiang'. Moreover, the northern blot analysis indicated that the Ct-Exp1 gene expressed more strongly in peel of 'Hong Jiang' than 'An Liu' during fruit ripening. These data suggest that enhanced loss of pectin and cellulose in the cellular walls of peel tissue of sweet orange could result in fruit creasing.


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Le document en format XML

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<div type="abstract" xml:lang="en">Citrus creasing results in serious economic loss in many citrus orchards. Based on the different incidence of creasing, two sweet orange cultivars 'Hong Jiang' (grafting chimaera of which flesh is mostly from Citrus reticulata Blanco and peel is from Citrus sinensis Osbeck in) and 'An Liu' (Citrus sinensis Osbeck) were used to investigate the creasing rate. The ultrastructure in cellular wall, cellular wall component, cellular wall degradation-related enzymes and expansin (Ct-Exp1) of sweet orange during fruit ripening in field were comparatively analyzed. 'Hong Jiang' sweet orange had a higher creasing rate than 'An Liu' during ripening. The activities of polygalacturonase, cellulase and pectinesterase in cellular wall of 'Hong Jiang' increased more markedly compared with 'An Liu'. The increases in the content of soluble pectin, ionically associated pectin, covalently bound pectin, hemicellulose and cellulose of 'Hong Jiang' were higher than those of'An Liu'. Furthermore, the enhanced degradation of the ultrastructure in the albedo cellular walls was observed in 'Hong Jiang'. Moreover, the northern blot analysis indicated that the Ct-Exp1 gene expressed more strongly in peel of 'Hong Jiang' than 'An Liu' during fruit ripening. These data suggest that enhanced loss of pectin and cellulose in the cellular walls of peel tissue of sweet orange could result in fruit creasing.</div>
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