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Expression profile of the Gh4CL genes in response to different abiotic stresses. a Heatmap showing the relative expression levels of each Gh4CL gene in each treatment showing at the bottom of the image. b The relative expression level of the selected Gh4CL genes under 20% PEG stress based on qRT-PCR. The GhUBQ7 gene was used as internal control. Error bars represents the standard deviation calculated from three biological replicates
