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Engineered drought and freezing tolerance in transgenic B. napus through constitutive expression of CBF1 (Jaglo et al., 2001). A, Three-week-old plants were frozen at −6°C for 2 d and then let to recover for 2 d at 28°C before pictures were taken. B, Seven-week-old greenhouse grown plants were withheld water for 1 week and then rewatered for 2 weeks before picture was taken.
