Ethylene production is impaired in pdx1 mutants. Production of ethylene (C2H4) was induced in the presence of the flg22 peptide elicitor. Seedlings used were grown in the presence or absence of Suc and pyridoxine (B6) as indicated until 10 DAG. The lines used are the wild type (WT), pdx1.1, pdx1.3, the upstream region of PDX1.1 fused to PDX1.3 (pPDX1.1:PDX1.3), the upstream region of PDX1.3 fused to PDX1.1 (pPDX1.3:PDX1.1), and the upstream region of PDX1.3 fused to PDX1.3 (pPDX1.3:PDX1.3). The data are from at least five biological repetitions. Error bars represent se.