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Purple and green stem Brassica napus plants under drought (10% PEG-6000), (A) chlorophyll a, (B) chlorophyll b, (C) carotenoids, and (D) anthocyanins, respectively. Different symbols represents significance level as *p = 0.05, **p = 0.01, ***p = 0.001, ****p = 0.0001. ns, non-significance.
