Excision of transposable elements from the chalcone isomerase and dihydroflavonol 4-reductase genes may contribute to the variegation of the yellow-flowered carnation (Dianthus caryophyllus)
2002
Itoh, Y. (Tokyo Univ. of Agriculture and Technology, Koganei (Japan). Faculty of Technology) | Higeta, D. | Suzuki, A. | Yoshida, H. | Ozeki, Y.
In the 'Rhapsody' cultivar of the carnation, which bears white flowers variegated with red flecks and sectors, a transposable element, dTdic1, belonging to the Ac/Ds superfamily, was found within the dihydroflavonol 4reductase (DFR) gene. The red flecks and sectors of 'Rhapsody' may be attributable to a reversion to DFR activity after the excision of dTdic1. The yellow color of the carnation petals is attributed to the synthesis and accumulation of chalcone 2'-glucoside. In several of the carnation cultivars that bear yellow flowers variegated with white flecks and sectors, both the chalcone isomerase (CHI) and DFR genes are disrupted by dTdic1.
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