Genome-Wide Identification and Characterization of bZIP Transcription Factors in Brassica oleracea under Cold Stress

Figure 2

Relative expression levels of 22 BolbZIP genes in cabbage inbred lines cold-tolerant BN106 and cold-susceptible BN107 under cold stress conditions. 5-week-old plants were treated at 4°C, 0°C, and −2°C. The actin transcript levels were used for normalization. Values shown are relative to transcript levels in the 22°C treated plants. Error bars indicate standard deviation. (a) Genes showing no significant relative expression change in BN106 and upregulating at all temperatures in BN107. (b) Genes showing upregulation at all temperatures in BN106 and no significant relative expression change in BN107. (c) Genes showing greater upregulation at lower temperatures in BN106 and BN107. (d) Genes showing downregulation in response to cold in BN106 and BN107.