Fig. 7From: Genome-wide investigation of WRKY gene family in pineapple: evolution and expression profiles during development and stressExpression profiles of the pineapple WRKY genes. a Hierachical clustering of expression profiles of pineapple WRKY genes in 30 samples including different tissues and developmental stages. b Expression analysis of 14 WRKY genes in eight representative samples by qRT-PCR. Data were normalized to β-actin gene and vertical bars indicate standard deviation. c The heatmap exhibit the ratio of the expression levels of pineapple WRKY genes between cold stress treatment and control conditionBack to article page