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Relative expression of ZjMPK and ZjMKK genes analyzed by qRT-PCR under phytoplasma infection. ZjACT primers were used as the internal standard for each gene. The mean expression value was calculated from 3 independent replicates. The vertical bars indicate the standard deviation. Significant and highly significant difference are shown as * (P < 0.05) and ** (P < 0.01), respectively
