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(A-E) Changes of StCDPKs relative expression in potato during different periods under long-term drought. Expression patterns of 20 CDPK genes by quantitative PCR analyses at 15, 20, and 25 days, respectively in both tolerant and drought-sensitive cultivar. The Green and orange line represents QS9 and Atlantic (Atl) cultivars, respectively. The actin gene was used as the internal control reference.
