The Expression of the Isovitexin 7-O-Xylosylating Gene gX in Silene pratensis and S. dioica is Restricted to the Petals
| Autor: | J. M. Steyns, Jan van Brederode |
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| Rok vydání: | 1986 |
| Předmět: | |
| Zdroj: | Zeitschrift für Naturforschung C. 41:537-541 |
| ISSN: | 1865-7125 0939-5075 |
| DOI: | 10.1515/znc-1986-5-608 |
| Popis: | The isovitexin-O-glycosylation patterns of rosette leaves, stem leaves and petals of Silene dioica plants were investigated. The 7-O -xylosylation of isovitexin, controlled by gene gX, only occurs in the petals. In the leaves isovitexin is 7-O -galactosylated, which is controlled by gene Xgal. Acyl groups may be linked to either the 7-O- or the 2″-O-substituted sugar; the former only occurs in the leaves, whereas the latter takes place both in leaves and petals. The restriction of the gX controlled enzyme activity and its product to the petals of Silene dioica plants is in complete agreement with previously obtained results (reference [2]) on the expression of g X in the genetic background of the closely related Silene pratensis, into which gX can be introduced by introgressive hybridization. On the basis of serological enzym e inhibition studies, it is argued that the absence of 7-O-xylosylation in the leaves is not due to post-translational inactivation of the gX controlled enzyme. The regulation of the expression of gene gX throughout ontogeny therefore differs markedly from that of two allelic g locus variants, controlling the 7-O-glucosylation of isovitexin. |
| Databáze: | OpenAIRE |
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