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High temperature-conditioning (3 days at 37°C) down-regulates the expression of the different genes involved in the carotenoid and subsequent biosynthesis of ABA. Orange and green squares represent repressed genes in response to heat (3 days at 37°C) and the heat+cold combination (3 days at 37°C+20 days at 2°C), respectively. Major changes in gene expression levels are indicated by using two squares.
