Journal
PLANT CELL
Volume 24, Issue 3, Pages 1242-1255Publisher
OXFORD UNIV PRESS INC
DOI: 10.1105/tpc.111.095232
Keywords
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Funding
- European Union [FOOD-CT-01730, 245121]
- John Innes Foundation
- Biological and Biotechnological Science Research Council
- Agronanotech Project MIPAF
- BBSRC [BBS/E/J/000CA424] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BBS/E/J/00000153, BBS/E/J/000CA424] Funding Source: researchfish
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Traditionally, Sicilian blood oranges (Citrus sinensis) have been associated with cardiovascular health, and consumption has been shown to prevent obesity in mice fed a high-fat diet. Despite increasing consumer interest in these health-promoting attributes, production of blood oranges remains unreliable due largely to a dependency on cold for full color formation. We show that Sicilian blood orange arose by insertion of a Copia-like retrotransposon adjacent to a gene encoding Ruby, a MYB transcriptional activator of anthocyanin production. The retrotransposon controls Ruby expression, and cold dependency reflects the induction of the retroelement by stress. A blood orange of Chinese origin results from an independent insertion of a similar retrotransposon, and color formation in its fruit is also cold dependent. Our results suggest that transposition and recombination of retroelements are likely important sources of variation in Citrus.
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