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Pairwise variation (PV) to identify the optimal number of HKGs for precise normalization. The PV (Vn/Vn+1) was analyzed between the NFs (Normalization Factors) NFn and NFn+1 using geNorm program. Abbreviations: HT: High Temperature treatment; Cold: Cold treatment; ABA: Abscisic Acid treatment; NaCl: Sodium Chloride treatment; PEG: Polyethylene Glycol treatment.
